[CentOS] centos vs rhel vs scientific linux

[Robert P. J. Day]

  i'm prepping to teach a 5-day intro class in linux starting in about
3 hours, and the courseware is clearly designed around RHEL
(apparently 5.1).  but since i'm not being provided with RHEL DVDs,
i'm just going to hand everyone a centos 5.4 DVD and take it from
there.

  as part of the intro, i want to briefly discuss the varieties of
linux related to RHEL, so obviously i want to mention what centos is
all about.  in a nutshell, it's simply RHEL with any RH-proprietary
branding removed, yes?  what's the simplest way to sum up the
difference in a sentence or two?

  and i've never used SL but, again as i understand it, it's also RHEL
unbranded but, IIRC, SL is more open to producing updates, whereas
centos is rigourous about tracking the corresponding RHEL version.

  does that sound about right?

rday
--


Robert P. J. Day   Waterloo, Ontario, CANADA

Linux Consulting, Training and Kernel Pedantry.

Web page:  http://crashcourse.ca
Twitter:   http://twitter.com/rpjday

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[CentOS] Kickstart wrong swap size

[Lars Hecking]

 All machines kickstarted here consistently have a swap partition with the
 wrong size. According to the RHEL5 manual:

| To determine the size of the swap partition automatically, use the
| --recommended option:
|
| swap --recommended
|
| The recommended maximum swap size for machines with less than 2GB of RAM is
| twice the amount of RAM. For machines with 2GB or more, this recommendation
| changes to 2GB plus the amount of RAM. 

 However, the swap partition on all kickstarted machines is 2GB, regardless
 of RAM size.

 This is the relevant portion of the kickstart file:

bootloader --location=mbr
selinux --disabled
reboot
clearpart --all --initlabel
part /boot --fstype ext3 --size=102
part / --fstype ext3 --size=20480
part swap --recommended
part /var --fstype ext3 --size=1 --grow

 The kickstart setup is currently based on CentOS 5.2 (and I cannot move to
 5.4 yet as this is a corporate setup affecting hundreds of machines).
 Hardcoding swap size isn't a good idea either because there's a range of
 different memory configurations. I could however confirm that a manual,
 graphical install from the 5.4 DVD with recommended settings creates 10GB
 swap on a 8GB RAM machine.


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[CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Diederick Stoffers]

Hi,

We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 64 bits 
version of Fedora 12 lists the correct amount of 128GB, CentOS only finds 32GB 
(and so does Scientific Linux). I would much prefer to use CentOS (most of the 
software we use is specifically designed for CentOS). Does anyone know what is 
causing this/how to fix it?

Many Thanks,

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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Rudi Ahlers]

what kernel are you running?

On Mon, Dec 7, 2009 at 2:05 PM, Diederick Stoffers  wrote:
> Hi,
> We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 64
> bits version of Fedora 12 lists the correct amount of 128GB, CentOS only
> finds 32GB (and so does Scientific Linux). I would much prefer to use CentOS
> (most of the software we use is specifically designed for CentOS). Does
> anyone know what is causing this/how to fix it?
> Many Thanks,
> Diederick
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>
>



-- 
Kind Regards
Rudi Ahlers
CEO, SoftDux Hosting
Web: http://www.SoftDux.com
Office: 087 805 9573
Cell: 082 554 7532
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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Diederick Stoffers]

[r...@localhost ~]# uname -a
Linux localhost.localdomain 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3 16:48:13 EST 
2009 x86_64 x86_64 x86_64 GNU/Linux


On 7 dec 2009, at 13:12, Rudi Ahlers wrote:

> what kernel are you running?
> 
> On Mon, Dec 7, 2009 at 2:05 PM, Diederick Stoffers  
> wrote:
>> Hi,
>> We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 64
>> bits version of Fedora 12 lists the correct amount of 128GB, CentOS only
>> finds 32GB (and so does Scientific Linux). I would much prefer to use CentOS
>> (most of the software we use is specifically designed for CentOS). Does
>> anyone know what is causing this/how to fix it?
>> Many Thanks,
>> Diederick
>> ___
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>> 
>> 
> 
> 
> 
> -- 
> Kind Regards
> Rudi Ahlers
> CEO, SoftDux Hosting
> Web: http://www.SoftDux.com
> Office: 087 805 9573
> Cell: 082 554 7532
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Re: [CentOS] Inquiry:How to compare two files but not in line-by-line basis?

[mark]

Les Mikesell wrote:
> mark wrote:
>> hadi motamedi wrote:
>>> On Thu, Dec 3, 2009 at 12:42 PM, mark  wrote:
 John Doe wrote:
> From: hadi motamedi 
>> Can you please do me favor and let me know if I can go further and try
 for
>> advanced search like finding how many rows inside a file have data that
>> does not start with a zero after the third comma ?
> Something like: awk -F, ' { print $4 } ' | grep -v "^0" | wc -l Use one
> command at a time to see how they work with each other (you might have to
> modify the grep a bit)...
 *sigh*

 Drive me crazy, why use multiple commands?

 awk -F 'BEGIN { FS = ","; }{if ( $3 !~ /^0 ) { count++; }} END { print
 count }'
 filename
>>> Sorry . I tried for your proposed procedure , as the followings :
>>> #awk -F 'BEGIN { FS = ","; }{if ( $3 !~ /^0 ) { count++; }} END { print
>>> count }' HLRSubscriber-2009173349.csv
>>> But my CentOS server didn't return to the prompt . Can you please let me
>>> know why it is in an end-less iterated loop ?
>>> Thank you in advance
>> Syntax error. You wrote
>> if ( $3 !~ /^0
>> not
>> if ( $3 !~ /^0/
>>
>> PLEASE: if you ask for help, and someone gives you examples, READ THE MAN 
>> PAGES 
>> SO THAT YOU KNOW WHAT YOU'RE DOING. I could have just as well have given you 
>> something that would have wiped your system (like system("rm -rf /").
> 
> Awk is just too weird for normal people.  I wouldn't even suggest reading 
> that 
> manual.  If you can't do what you want with regexps and a pipeline of simpler 
> programs, you might as well use perl.



ROTFLMAO!
> 
> But:
> grep -v '^.*,.*,.*,0' filename |wc -l
> seems simple enough and says what you mean.
> 
> Or:
> cut -d, -f4 | grep -v '^0' |wc -l
> 
So, is there an obfuscated shell contest?

mark

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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Nickolay Bunev]

Hi,
It seems that this links shed light on the question:
http://lists.xensource.com/archives/html/xen-users/2008-08/msg00934.html
http://www.centos.org/docs/5/html/5.1/Virtualization_Guide/ch-virt-hw-support.html

On 12/07/2009 02:05 PM, Diederick Stoffers wrote:
> Hi,
> 
> We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The
> 64 bits version of Fedora 12 lists the correct amount of 128GB, CentOS
> only finds 32GB (and so does Scientific Linux). I would much prefer to
> use CentOS (most of the software we use is specifically designed for
> CentOS). Does anyone know what is causing this/how to fix it?
> 
> Many Thanks,
> 
> Diederick
> 
> 
> 
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Re: [CentOS] centos vs rhel vs scientific linux

[Lanny Marcus]

On Mon, Dec 7, 2009 at 4:52 AM, Robert P. J. Day  wrote:
>
>  i'm prepping to teach a 5-day intro class in linux starting in about
> 3 hours, and the courseware is clearly designed around RHEL
> (apparently 5.1).  but since i'm not being provided with RHEL DVDs,
> i'm just going to hand everyone a centos 5.4 DVD and take it from
> there.
>
>  as part of the intro, i want to briefly discuss the varieties of
> linux related to RHEL, so obviously i want to mention what centos is
> all about.  in a nutshell, it's simply RHEL with any RH-proprietary
> branding removed, yes?  what's the simplest way to sum up the
> difference in a sentence or two?
>
>  and i've never used SL but, again as i understand it, it's also RHEL
> unbranded but, IIRC, SL is more open to producing updates, whereas
> centos is rigourous about tracking the corresponding RHEL version.
>
>  does that sound about right?

Robert: CentOS is the binary equivalent of RHEL, made legally from
freely distributed RHEL source. The primary changes are to remove
anything proprietary to Red Hat, logos, etc.  And, if there is
anything they include that is proprietary, that is removed. I believe
the updating process for CentOS was changed, when CentOS 5.0 came out,
to improve things, but in general, should be binary equivalent, which
is the goal. You said your class was going to begin in 3 hours, so
hopefully later you will come back to this thread and someone more
knowledgeable can give you a more detailed answer than I can. RHEL
costs $ and  CentOS is freely distributed. Probably CentOS is the most
widely used distro on servers.  RHEL comes with some support,
depending upon what is purchased, and requires a license for each box.
 These are Enterprise distros and do not have the latest and greatest.
They do have a very long supported life and more security and
stability that distros with the latest and greatest.  I have no
experience with SL, but believe it has some things that do not come
with RHEL/CentOS.  HTH.  Lanny
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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Marcelo M. Garcia]

Diederick Stoffers wrote:
> Hi,
> 
> We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 
> 64 bits version of Fedora 12 lists the correct amount of 128GB, CentOS 
> only finds 32GB (and so does Scientific Linux). I would much prefer to 
> use CentOS (most of the software we use is specifically designed for 
> CentOS). Does anyone know what is causing this/how to fix it?
> 
> Many Thanks,
> 
> Diederick
> 
Hi

Very strange. I have a Dell Precision T7500 with 48GB of memory and 
CentOS-5.4 finds everything:
kalyke (Linux)$ uname -rm; free
2.6.18-164.6.1.el5 x86_64
  total   used   free sharedbuffers cached
Mem:  49453972   482735921180380  0 219116   41775056
-/+ buffers/cache:6279420   43174552
Swap: 50331604  0   50331604
kalyke (Linux)$

Regards

mg.

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[CentOS] Name Resolution Broken for One Address

[John Thomas]

I seem to have broken my laptop and have been unable to figure it out.

Name resolution works great, except one address, which seems to be 
resolving to 0.0.0.1.  Could you help me figure out what I have done and 
fix it?

The following lines are in /etc/hosts
192.168.11.1dev.example.com
192.168.11.1dev1.example.com

Pinging any other address that I try works, except dev.example.com.

centos54[r...@ctlaptop etc]# ping dev1.example.com
PING dev1.example.com (192.168.11.1) 56(84) bytes of data.
64 bytes from dev.example.com (192.168.11.1): icmp_seq=1 ttl=64 
time=0.093 ms

centos54[r...@ctlaptop ~]# ping dev.example.com
connect: Invalid argument
centos54[r...@ctlaptop ~]# strace ping dev.example.com
execve("/bin/ping", ["ping", "dev.example.com"], [/* 33 vars */]) = 0
brk(0)  = 0x88f1000
access("/etc/ld.so.preload", R_OK)  = -1 ENOENT (No such file or 
directory)
open("/etc/ld.so.cache", O_RDONLY)  = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=82386, ...}) = 0
mmap2(NULL, 82386, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7f8b000
close(3)= 0
open("/lib/libresolv.so.2", O_RDONLY)   = 3
read(3, 
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300p\277\0004\0\0\0"..., 512) 
= 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=76400, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0xb7f8a000
mmap2(NULL, 75976, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) 
= 0xd62000
mmap2(0xd71000, 8192, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xe) = 0xd71000
mmap2(0xd73000, 6344, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xd73000
close(3)= 0
open("/lib/libc.so.6", O_RDONLY)= 3
read(3, 
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340\277.\0004\0\0\0"..., 512) 
= 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1611564, ...}) = 0
mmap2(NULL, 1328580, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 
0) = 0x994000
mmap2(0xad3000, 12288, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13f) = 0xad3000
mmap2(0xad6000, 9668, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xad6000
close(3)= 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0xb7f89000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7f896c0, 
limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, 
limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0xad3000, 8192, PROT_READ) = 0
mprotect(0xd71000, 4096, PROT_READ) = 0
mprotect(0x15e000, 4096, PROT_READ) = 0
munmap(0xb7f8b000, 82386)   = 0
socket(PF_INET, SOCK_RAW, IPPROTO_ICMP) = 3
getuid32()  = 0
setuid32(0) = 0
brk(0)  = 0x88f1000
brk(0x8912000)  = 0x8912000
getpid()= 5376
open("/etc/resolv.conf", O_RDONLY)  = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=109, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0xb7f9f000
read(4, "# Generated by NetworkManager\ndo"..., 4096) = 109
read(4, "", 4096)   = 0
close(4)= 0
munmap(0xb7f9f000, 4096)= 0
socket(PF_FILE, SOCK_STREAM, 0) = 4
fcntl64(4, F_SETFL, O_RDWR|O_NONBLOCK)  = 0
connect(4, {sa_family=AF_FILE, path="/var/run/nscd/socket"...}, 110) = 0
send(4, "\2\0\0\0\r\0\0\0\6\0\0\0hosts\0", 18, MSG_NOSIGNAL) = 18
poll([{fd=4, events=POLLIN|POLLERR|POLLHUP}], 1, 5000) = 1 ([{fd=4, 
revents=POLLIN}])
recvmsg(4, {msg_name(0)=NULL, msg_iov(2)=[{"hosts\0", 6}, 
{"\270O\3\0\0\0\0\0", 8}], msg_controllen=16, {cmsg_len=16, 
cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, {5}}, msg_flags=0}, 0) = 14
mmap2(NULL, 217016, PROT_READ, MAP_SHARED, 5, 0) = 0xb7f54000
close(5)= 0
close(4)= 0
socket(PF_INET, SOCK_DGRAM, IPPROTO_IP) = 4
connect(4, {sa_family=AF_INET, sin_port=htons(1025), 
sin_addr=inet_addr("0.0.0.1")}, 16) = -1 EINVAL (Invalid argument)
dup(2)  = 5
fcntl64(5, F_GETFL) = 0x2 (flags O_RDWR)
fstat64(5, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 
0) = 0xb7f9f000
_llseek(5, 0, 0xbfd43234, SEEK_CUR) = -1 ESPIPE (Illegal seek)
write(5, "connect: Invalid argument\n", 26connect: Invalid argument
) = 26
close(5)= 0
munmap(0xb7f9f000, 4096)= 0
exit_group(2)   = ?

-- 
Sincerely,
John Thomas
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Re: [CentOS] NFS new security requirements?

[Mike Yates]

This now mysteriously resolved after both servers have rebooted.
The long delay is due to the importance of high availability over the nfs links.

Mike Yates

Hawkgrove Ltd  -  Software Systems Design
2, The Business Courtyard, Marl Pits Lane, Trudoxhill, Frome, Somerset, BA11 
5DL, UK
+44 (0)1373 837900 fax:  +44 (0)8700 518155
Registered in England: 2756481  VAT Reg: UK 601 1137 11
Registered Office: NSO Associates LLP, 75 Springfield Road, Chelmsford, Essex 
CM2 6JB
All e-mail is subject to contract and is not intended to create a legally 
binding agreement. 
Hawkgrove Ltd will only be bound by an agreement in writing signed by an 
authorized signatory.
All outgoing email is scanned by Kerio, using ClamAV 0.95.1/10117/Mon Dec  7 
02:21:53 2009 Known viruses: 662464.

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Re: [CentOS] Kickstart wrong swap size

[Lars Hecking]

Lars Hecking writes:
> 
>  All machines kickstarted here consistently have a swap partition with the
>  wrong size. According to the RHEL5 manual:
> 
> | To determine the size of the swap partition automatically, use the
> | --recommended option:
> |
> | swap --recommended
> |
> | The recommended maximum swap size for machines with less than 2GB of RAM is
> | twice the amount of RAM. For machines with 2GB or more, this recommendation
> | changes to 2GB plus the amount of RAM. 
> 
>  However, the swap partition on all kickstarted machines is 2GB, regardless
>  of RAM size.
 
 This seems to be a 5.2-specific bug - 5.3 and 5.4 appear to do the right thing.

 Time to upgrade, I guess.


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Re: [CentOS] Name Resolution Broken for One Address

[Jon Moore]

On Monday, December 7, 2009, John Thomas  wrote:
> I seem to have broken my laptop and have been unable to figure it out.
>
> Name resolution works great, except one address, which seems to be
> resolving to 0.0.0.1.  Could you help me figure out what I have done and
> fix it?
>
> The following lines are in /etc/hosts
> 192.168.11.1    dev.example.com
> 192.168.11.1    dev1.example.com
>
> Pinging any other address that I try works, except dev.example.com.
>

try having both host names on the same line.

-jon
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[CentOS] Invitation to connect on LinkedIn

[Gustavo Pastorino]

LinkedIn


Gustavo Pastorino requested to add you as a connection on LinkedIn:
--

Romeo,

I'd like to add you to my professional network on LinkedIn.

- Gustavo

Accept invitation from Gustavo Pastorino
http://www.linkedin.com/e/c640Z0zoY42Hba6yQ6iWhZknxFvA/blk/I1640011014_2/pmpxnSRJrSdvj4R5fnhv9ClRsDgZp6lQs6lzoQ5AomZIpn8_cBYQcj0Ncj0Md3oNiiZJrmQVgzxbqyYQej0Re34OcjALrCBxbOYWrSlI/EML_comm_afe/

View invitation from Gustavo Pastorino
http://www.linkedin.com/e/c640Z0zoY42Hba6yQ6iWhZknxFvA/blk/I1640011014_2/39vd34Mcj4Mc3gSckALqnpPbOYWrSlI/svi/

--

Why might connecting with Gustavo Pastorino be a good idea?

People Gustavo Pastorino knows can discover your profile:
Connecting to Gustavo Pastorino will attract the attention of LinkedIn users. 
See who's been viewing your profile:

http://www.linkedin.com/e/wvp/inv18_wvmp/

 
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(c) 2009, LinkedIn Corporation

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Re: [CentOS] Name Resolution Broken for One Address

[John Thomas]

On 12/07/2009 05:09 AM, Jon Moore wrote:
>> The following lines are in /etc/hosts
>> 192.168.11.1dev.example.com
>> 192.168.11.1dev1.example.com
>>
>> Pinging any other address that I try works, except dev.example.com.
>>
>
> try having both host names on the same line.

Thanks, but this did not help.  I had tried many, many things before 
posting.  I tried this to be sure, but no help.

-- 
Sincerely,
John Thomas
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Re: [CentOS] Name Resolution Broken for One Address

[Arturas Skauronas]

On Mon, Dec 7, 2009 at 3:17 PM, John Thomas
 wrote:
>>> Pinging any other address that I try works, except dev.example.com.
>> try having both host names on the same line.
>
> Thanks, but this did not help.  I had tried many, many things before
> posting.  I tried this to be sure, but no help.

do you have NetworkManager installed?
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Re: [CentOS] Name Resolution Broken for One Address

[John Thomas]

On 12/07/2009 05:21 AM, Arturas Skauronas wrote:
> On Mon, Dec 7, 2009 at 3:17 PM, John Thomas
>   wrote:
 Pinging any other address that I try works, except dev.example.com.
>>> try having both host names on the same line.
>>
>> Thanks, but this did not help.  I had tried many, many things before
>> posting.  I tried this to be sure, but no help.
>
> do you have NetworkManager installed?

Yes.

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John Thomas
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Re: [CentOS] Name Resolution Broken for One Address

[John Thomas]

On 12/07/2009 04:59 AM, John Thomas wrote:
> I seem to have broken my laptop and have been unable to figure it out.
>
> Name resolution works great, except one address, which seems to be
> resolving to 0.0.0.1.  Could you help me figure out what I have done and
> fix it?
>
> The following lines are in /etc/hosts
> 192.168.11.1  dev.example.com
> 192.168.11.1  dev1.example.com

Possibly fixed.  There is possibly a bad entry in the nscd cache. 
Restarting nscd did not solve the problem until I changed /etc/nscd.conf
from: enable-cachehosts   yes
to:   enable-cachehosts   no

I am not sure why restarting (machine and/or nscd daemon) did not clear 
the cache.

-- 
Sincerely,
John Thomas
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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Diederick Stoffers]

Thanks! Virtualisation limits RAM to 32GB, removing this from the package does 
the trick.

Cheers,

Diederick

On 7 dec 2009, at 13:35, Nickolay Bunev wrote:

> Hi,
> It seems that this links shed light on the question:
> http://lists.xensource.com/archives/html/xen-users/2008-08/msg00934.html
> http://www.centos.org/docs/5/html/5.1/Virtualization_Guide/ch-virt-hw-support.html
> 
> On 12/07/2009 02:05 PM, Diederick Stoffers wrote:
>> Hi,
>> 
>> We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The
>> 64 bits version of Fedora 12 lists the correct amount of 128GB, CentOS
>> only finds 32GB (and so does Scientific Linux). I would much prefer to
>> use CentOS (most of the software we use is specifically designed for
>> CentOS). Does anyone know what is causing this/how to fix it?
>> 
>> Many Thanks,
>> 
>> Diederick
>> 
>> 
>> 
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Re: [CentOS] Name Resolution Broken for One Address

[Stephen Harris]

On Mon, Dec 07, 2009 at 05:33:59AM -0800, John Thomas wrote:
> Possibly fixed.  There is possibly a bad entry in the nscd cache. 
> Restarting nscd did not solve the problem until I changed /etc/nscd.conf
> from: enable-cachehosts   yes
> to:   enable-cachehosts   no
> 
> I am not sure why restarting (machine and/or nscd daemon) did not clear 
> the cache.

/var/db/nscd is the persistent cache location - you need to clear that
out after stopping nscd if you want to clear the cache.

-- 

rgds
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Re: [CentOS] Inquiry:How to compare two files but not in line-by-line basis?

[Les Mikesell]

mark wrote:
> Les Mikesell wrote:
>> Awk is just too weird for normal people.  I wouldn't even suggest reading 
>> that 
>> manual.  If you can't do what you want with regexps and a pipeline of 
>> simpler 
>> programs, you might as well use perl.
> 
> 


Who have probably almost all started something in awk and ended up either 
needing a pipeline of other programs or switching to perl.  If your machine is 
powerful enough to run perl (and I can't imagine one that isn't in this 
century) 
you might as well use it because it does anything awk can do and more.  awk is 
almost as complicated to learn but can't do as much and is harder to debug. 
Maybe it made sense on computers of the 1970's, or before perl was available.

> ROTFLMAO!
>> But:
>> grep -v '^.*,.*,.*,0' filename |wc -l
>> seems simple enough and says what you mean.
>>
>> Or:
>> cut -d, -f4 | grep -v '^0' |wc -l
>>
> So, is there an obfuscated shell contest?

Shell commands are just what you'd type so you have to know it anyway so there 
is nothing special about making a program out of it. Other than grep using 
regexps the man pages for those programs are probably literally a page.  No one 
is going to understand awk or perl after reading a page. Personally I'd 
probably 
have loaded the file in vi, done ':v/^.*,.*,.*,0/d', then hit ctl-g to see how 
many lines were left, then u to put them back.

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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Peter Kjellstrom]

On Monday 07 December 2009, Diederick Stoffers wrote:
> Hi,
>
> We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 64
> bits version of Fedora 12 lists the correct amount of 128GB, CentOS only
> finds 32GB (and so does Scientific Linux).

Hmm.. maybe this has to do with the Xen kernel. Redhat says x86_64 should do 
256G/1T (AMD/Intel) and we're successfully running 72G on Centos-5.4.

/Peter

> I would much prefer to use 
> CentOS (most of the software we use is specifically designed for CentOS).
> Does anyone know what is causing this/how to fix it?
>
> Many Thanks,
>
> Diederick


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Re: [CentOS] Kickstart wrong swap size

[John Doe]

From: Lars Hecking 
> All machines kickstarted here consistently have a swap partition with the
> wrong size. According to the RHEL5 manual:
> 
> | To determine the size of the swap partition automatically, use the
> | --recommended option:
> |
> | swap --recommended
> |
> | The recommended maximum swap size for machines with less than 2GB of RAM is
> | twice the amount of RAM. For machines with 2GB or more, this recommendation
> | changes to 2GB plus the amount of RAM. 
> 
> However, the swap partition on all kickstarted machines is 2GB, regardless
> of RAM size.

The installation guide says "between":

"If the system memory is between 128MB and 2GB, the size of the swap
partition will be between the system memory size and twice the amount
of system memory. For example, a system with 1GB of system memory will
have a swap partition sized *** between 1GB and 2GB ***.
If the system memory is higher than 2GB, the size of the swap partition
will be a between 1GB and 2GB plus system memory. For example, a system
with 4GB of system memory will have a swap partition sized *** between 1GB
and 6GB ***."

You could always have a pre-script generate the 'correct' swap size (based on 
your own formula), put it in a file and include that file in the kickstart 
file...

JD


  
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Re: [CentOS] Name Resolution Broken for One Address

[Alan McKay]

> The following lines are in /etc/hosts
> 192.168.11.1    dev.example.com
> 192.168.11.1    dev1.example.com
>
> Pinging any other address that I try works, except dev.example.com.

Same IP?

Aren't you supposed to do that like this?

192.168.11.1  dev.example.com dev1.example.com





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 - Michael Pollan, author of "In Defense of Food"
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Re: [CentOS] Inquiry:How to compare two files but not in line-by-line basis?

[m . roth]

> mark wrote:
>> Les Mikesell wrote:
>>> Awk is just too weird for normal people.  I wouldn't even suggest
>>> reading that manual.  If you can't do what you want with regexps and a
>>> pipeline of simpler programs, you might as well use perl.
>>
>> 
>
Reading the response, I realize you were serious, not being funny, as I
thought.

> Who have probably almost all started something in awk and ended up either
> needing a pipeline of other programs or switching to perl.  If your
> machine is powerful enough to run perl (and I can't imagine one that
> isn't in this century) you might as well use it because it does anything
> awk can do and more.

I started seeing references to perl in the early nineties, so it ran on
those machines. Also, I remember running into Larry Wall, and responding
to him very irritatedly, around '93 or '94, when he showed up on
comp.language.awk, and told someone the answer to his question was to go
to perl. Now, I really like perl, but for some things - like were I want
to do nothing but process one or maybe two text files at a time, and want
to loop through the whole thing, it's simpler.

> awk is almost as complicated to learn but can't do as much and is harder

"Almost as complicated to learn"? I had no trouble learning it around, oh,
'91. But then, at that point I'd been programming professionally for more
than 10 years. If you know perl, and you can program shell, and if you
know any other language (unless *all* you know is Objectionably Oriented
languages), there's minimal ramp-up time.

> Maybe it made sense on computers of the 1970's, or before perl was
> available.

awk standardized pretty much, according to what I've read - possibly man
pages on Sun 3's or Irix - around '83. perl was *NOT* part of std. distros
until the end of the nineties. And they do a lot of the same thing. To
some degree, it's a matter of preferences, and to put down awk as "almost
as complicated as perl to learn" does not impress me.

> Shell commands are just what you'd type so you have to know it anyway so
> there is nothing special about making a program out of it. Other than
> grep using regexps the man pages for those programs are probably

And regexes have always been considered a black art - there's always the
"how many escapes do you need for this", esp. if it's in a script.

> literally a page. No one is going to understand awk or perl after reading
> a page. Personally I'd probably

So, you don't actually know any programming, and it sounds like you want
to learn as little as possible, even though doing so will make your life
easier upstream.

Try it - you might find that to be the case.

Oh, and if you're on this list, then the mundane world doesn't consider
you "normal", anyway; you're a geek, or a wonk, or a
fill-in-the-stereotype-put-down-name, not a "k3wl dud3".

mark

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[CentOS] Resizing / partition ?

[armann]

Hi. 

I know this has probably been discussed a lot so I'm sorry, noob
here.  

I found a good tutorial here:


http://fedorasolved.org/Members/zcat/shrink-lvm-for-new-partition 

My
only problem is understanding this. 

"To calculate the new End sector, ADD
the partition Start sector to the PV PSize, and then add a safety margin of
around 131072 sectors (64MB) to that." 

If anybody has another way of
doing this or any comments that would be great. 

Thanks. 

Armann Jakob
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Re: [CentOS] Kickstart wrong swap size

[nate]

Lars Hecking wrote:
>

>  The kickstart setup is currently based on CentOS 5.2 (and I cannot move to
>  5.4 yet as this is a corporate setup affecting hundreds of machines).
>  Hardcoding swap size isn't a good idea either because there's a range of
>  different memory configurations. I could however confirm that a manual,
>  graphical install from the 5.4 DVD with recommended settings creates 10GB
>  swap on a 8GB RAM machine.

For my systems I have a bit of logic in my %pre kickstart config
that looks for a swapsize command line option and uses that as the
swap size(if it doesn't find one it defaults to 4G, I really never
want my own systems swapping more than 4G, I set my VMs to 1G of
swap).

nate

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Re: [CentOS] Is ext4 safe for a production server?

[Brent L. Bates]

 XFS is the most stable file system I've seen or used.  I've seen it
survive power failures and disk problems with out a problem.  It is the ONLY
file system I trust.  It is stable, reliable, dependable, and practically
bullet proof.  I've been using XFS almost since it came into existence on
SGI's (IRIX) and we've been using it under Linux for years too, also with out
problems.
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Re: [CentOS] Is ext4 safe for a production server?

[cornel panceac]

2009/12/7 Brent L. Bates 

> XFS is the most stable file system I've seen or used.  I've seen it
> survive power failures and disk problems with out a problem.  It is the
> ONLY
> file system I trust.  It is stable, reliable, dependable, and practically
> bullet proof.  I've been using XFS almost since it came into existence on
> SGI's (IRIX) and we've been using it under Linux for years too, also with
> out
> problems.
>
>
> what other file systems you've used and how they compare to ext4? thnx


-- 
Linux counter #213090
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Re: [CentOS] Inquiry:How to compare two files but not in line-by-line basis?

[Les Mikesell]

m.r...@5-cent.us wrote:
>> mark wrote:
>>> Les Mikesell wrote:
 Awk is just too weird for normal people.  I wouldn't even suggest
 reading that manual.  If you can't do what you want with regexps and a
 pipeline of simpler programs, you might as well use perl.
>>> 
> Reading the response, I realize you were serious, not being funny, as I
> thought.
> 

Yes, I'm serious that if you don't already know awk, there is little to 
be gained from looking at it now.  Perl can do everything awk can do and 
more, while shell scripts can do the simpler things.

>> Who have probably almost all started something in awk and ended up either
>> needing a pipeline of other programs or switching to perl.  If your
>> machine is powerful enough to run perl (and I can't imagine one that
>> isn't in this century) you might as well use it because it does anything
>> awk can do and more.
> 
> I started seeing references to perl in the early nineties, so it ran on
> those machines. Also, I remember running into Larry Wall, and responding
> to him very irritatedly, around '93 or '94, when he showed up on
> comp.language.awk, and told someone the answer to his question was to go
> to perl. Now, I really like perl, but for some things - like were I want
> to do nothing but process one or maybe two text files at a time, and want
> to loop through the whole thing, it's simpler.

No, it is just different.  If you want perl to loop, it can. Try the a2p 
translator.

>> awk is almost as complicated to learn but can't do as much and is harder
> 
> "Almost as complicated to learn"? I had no trouble learning it around, oh,
> '91. But then, at that point I'd been programming professionally for more
> than 10 years. If you know perl, and you can program shell, and if you
> know any other language (unless *all* you know is Objectionably Oriented
> languages), there's minimal ramp-up time.

If you know perl, there's no point in downgrading to awk.  If you don't 
know either, you will find awk to be weird and unlike anything else. 
Back when it was the only way to do math in a shell script it might have 
been worth the trouble.

> awk standardized pretty much, according to what I've read - possibly man
> pages on Sun 3's or Irix - around '83. perl was *NOT* part of std. distros
> until the end of the nineties. And they do a lot of the same thing. To
> some degree, it's a matter of preferences, and to put down awk as "almost
> as complicated as perl to learn" does not impress me.

OK, I'll revise that and say it is much, much harder to use awk to 
accomplish tasks in general than it is with perl.   First there is the 
problem of the things that awk just can't do at all - like inputting 
data from places other than stdin or files, so you'll end up embedding 
awk in a shell script with other tools doing the heavy lifting, and 
probably having to arrange shell variable expansion into the awk script. 
  Then there is the real advantage of perl over almost every other 
language, which is that anything you are likely to want to do will 
already have been done and is available as a module on CPAN - so you 
will probably only have to write half a page or so yourself even for 
large jobs and things that get data from sockets, databases or URLs.

> 
>> Shell commands are just what you'd type so you have to know it anyway so
>> there is nothing special about making a program out of it. Other than
>> grep using regexps the man pages for those programs are probably
> 
> And regexes have always been considered a black art - there's always the
> "how many escapes do you need for this", esp. if it's in a script.

You can't get too far without understanding shell parsing even if you 
just type stuff on the command line.  But, regexps within a perl script 
don't have to deal with this at all.

>> literally a page. No one is going to understand awk or perl after reading
>> a page. Personally I'd probably
> 
> So, you don't actually know any programming, and it sounds like you want
> to learn as little as possible, even though doing so will make your life
> easier upstream.
> 
> Try it - you might find that to be the case.

Wrong conclusion.  I've started a lot of things in shell and awk and hit 
dead ends when I needed functionality that they couldn't handle - and 
ended up starting over in perl.  Now I would only start in shell if I 
know the simpler utilities can handle the whole job (which, as data is 
increasingly handled in databases and xml over networks, is increasingly 
rare).

> Oh, and if you're on this list, then the mundane world doesn't consider
> you "normal", anyway; you're a geek, or a wonk, or a
> fill-in-the-stereotype-put-down-name, not a "k3wl dud3".

Agreed, but for this group, understanding regexps and the shell is 
fairly essential and needing perl's full functionality is probably 
common, where awk is just a historical oddity.  It still works for its 
old tasks, but it's not up to the ways data is currently handled and is 
likely t

Re: [CentOS] Is ext4 safe for a production server?

[Les Mikesell]

Brent L. Bates wrote:
>  XFS is the most stable file system I've seen or used.  I've seen it
> survive power failures and disk problems with out a problem.  It is the ONLY
> file system I trust.  It is stable, reliable, dependable, and practically
> bullet proof.  I've been using XFS almost since it came into existence on
> SGI's (IRIX) and we've been using it under Linux for years too, also with out
> problems.

I think the main source of reported problems was on 32-bit linux on 
distros that used 4k stacks - and perhaps there mostly where lvm/md/nfs 
layers were also involved.

-- 
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lesmikes...@gmail.com
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Re: [CentOS] Inquiry:How to compare two files but not in line-by-line basis?

[m . roth]

> m.r...@5-cent.us wrote:
>>> mark wrote:
 Les Mikesell wrote:
> Awk is just too weird for normal people.  I wouldn't even suggest
> reading that manual.  If you can't do what you want with regexps and
> a
> pipeline of simpler programs, you might as well use perl.
 
>> Reading the response, I realize you were serious, not being funny, as I
>> thought.
>
> Yes, I'm serious that if you don't already know awk, there is little to
> be gained from looking at it now.  Perl can do everything awk can do and
> more, while shell scripts can do the simpler things.

Ok, there's no point to continuing this - I use whatever tool I feel like,
and which is simplest to me to do the job: the *Nix way. I also know a
perl bigot when I see one.

You *also* missed the reason I was pushing the original poster to read the
man page, rather than just do what I said, without trying to understand
what I was suggesting they do - they made a sytactical mistake that would
have had the *same* result in perl - he missed the closing / on the
expression

mark

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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Thomas Harold]

On 12/7/2009 7:24 AM, Diederick Stoffers wrote:
 > [r...@localhost ~]# uname -a
 > Linux localhost.localdomain 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3
 > 16:48:13 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
 >

If you dig back through the xen-users mailing list, there's a thread 
that discusses this recently.  Look for a subject of "[Xen-users] Memory 
not seen in Dom0" back around Nov 8th.  I tried to get GMane's web 
interface to toss up a direct link to the thread, but gave up.

nntp://news.gmane.org/gmane.comp.emulators.xen.user

Supposedly, it's not an issue unless you really really want >32GB in the 
Dom0 host.  The Xen 64bit kernel (currently?) limits the Dom0 to 32GB. 
But any guest VMs that you create will initially use the RAM not used by 
the Dom0.

Most folks recommend that you limit Dom0's memory usage in grub.conf 
(using the dom0_mem= argument).  Or you can set it later using "xm 
mem-set 0 ###M".

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Re: [CentOS] Inquiry:How to compare two files but not in line-by-line basis?

[Les Mikesell]

m.r...@5-cent.us wrote:
>
>> Awk is just too weird for normal people.  I wouldn't even suggest
>> reading that manual.  If you can't do what you want with regexps and
>> a
>> pipeline of simpler programs, you might as well use perl.
> 
>>> Reading the response, I realize you were serious, not being funny, as I
>>> thought.
>> Yes, I'm serious that if you don't already know awk, there is little to
>> be gained from looking at it now.  Perl can do everything awk can do and
>> more, while shell scripts can do the simpler things.
> 
> Ok, there's no point to continuing this - I use whatever tool I feel like,
> and which is simplest to me to do the job: the *Nix way. I also know a
> perl bigot when I see one.

You seem to have missed all the places that I mentioned already knowing 
awk as an exception. I'm just not recommending taking the time to learn 
it if you don't already - and if you want to call logical conclusions 
for the reasons I posted bigotry, fine - be that way.

> You *also* missed the reason I was pushing the original poster to read the
> man page, rather than just do what I said, without trying to understand
> what I was suggesting they do - they made a sytactical mistake that would
> have had the *same* result in perl - he missed the closing / on the
> expression

Sure, but perl would have told you 'search pattern not terminated at 
line xx', or you would have gotten this from running 'perl -c' to check 
syntax ahead of time.  Would you care to disclose how many of your own 
hours you've wasted on the mysteries of awk before you learned to read 
that carefully?

-- 
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 lesmikes...@gmail.com

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Re: [CentOS] Is ext4 safe for a production server?

[Brent L. Bates]

 I guess I forgot to include that some of those Linux systems I've used
XFS on were 32 bit OS installs.  However, lvm was not used on them, md & NFS
were, but not lvm.
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[CentOS] Installing R on CentOS 5

[Diederick Stoffers]

Hi,

Has anyone been able to successfully install R on CentOS5.4? I am having 
problems with dependencies perl is installed.

Cheers,

Diederick

--> Finished Dependency Resolution
R-core-2.10.0-2.el5.x86_64 from R-project has depsolving problems
  --> Missing Dependency: perl(File::Copy::Recursive) is needed by package 
R-core-2.10.0-2.el5.x86_64 (R-project)

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Re: [CentOS] Installing R on CentOS 5

[Joshua Baker-LePain]

On Mon, 7 Dec 2009 at 6:45pm, Diederick Stoffers wrote

> Has anyone been able to successfully install R on CentOS5.4? I am having 
> problems with dependencies perl is installed.

I use the packages from EPEL without a problem.

-- 
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QB3 Shared Cluster Sysadmin
UCSF
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Re: [CentOS] Installing R on CentOS 5

[Arturas Skauronas]

On Mon, Dec 7, 2009 at 7:45 PM, Diederick Stoffers  wrote:
> Hi,
> Has anyone been able to successfully install R on CentOS5.4? I am having
> problems with dependencies perl is installed.
> --> Finished Dependency Resolution
> R-core-2.10.0-2.el5.x86_64 from R-project has depsolving problems
>   --> Missing Dependency: perl(File::Copy::Recursive) is needed by package
> R-core-2.10.0-2.el5.x86_64 (R-project)

but do you have installed perl-File-Copy-Recursive?
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Re: [CentOS] Installing R on CentOS 5

[Peter Kjellstrom]

On Monday 07 December 2009, Diederick Stoffers wrote:
> Hi,
>
> Has anyone been able to successfully install R on CentOS5.4? I am having
> problems with dependencies perl is installed.

R is in epel and should as such be trivial to install.

/Peter

> Cheers,
>
> Diederick
>
> --> Finished Dependency Resolution
> R-core-2.10.0-2.el5.x86_64 from R-project has depsolving problems
>   --> Missing Dependency: perl(File::Copy::Recursive) is needed by package
> R-core-2.10.0-2.el5.x86_64 (R-project)


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Re: [CentOS] Installing R on CentOS 5

[Les Mikesell]

Diederick Stoffers wrote:
> Hi,
> 
> Has anyone been able to successfully install R on CentOS5.4? I am having 
> problems with dependencies perl is installed.
> 
> Cheers,
> 
> Diederick
> 
> --> Finished Dependency Resolution
> R-core-2.10.0-2.el5.x86_64 from R-project has depsolving problems
>   --> Missing Dependency: perl(File::Copy::Recursive) is needed by 
> package R-core-2.10.0-2.el5.x86_64 (R-project)

You probably need to add the epel yum repository.

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[CentOS] lvm monitoring

[Karanbir Singh]

Hi,

At the moment, I am monitoring my lvm resources on a machine with the 
usual 'pvs;vgs;lvs' output and comparing with whatever is a known good 
state. But this has a few problems:

1- I need to setup a known good state per machine, which can look quite 
different from each other : specially when machines are getting dynamic 
vm builds and teardowns dozens of times per day, or when disk resource 
allocations are spread over more than one machine.

2- Its hard to work out what is really going on with bits that are not 
mounted ( like snapshots ).

3- its hard to tie down to physical media ( I screen scrape at the 
moment, which is dirty and exceptionally prone to nose! )

I am sure there are plenty of people who are monitoring lvm setups on 
their machines, just wondering what it is that you guys are doing.

- KB
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Re: [CentOS] Is ext4 safe for a production server?

[Florin Andrei]

John R Pierce wrote:
> 
> I've always avoided XFS because A) it wsan't supported natively in RHEL 
> anyways, and B) I've heard far too many stories about catastrophic loss 
> problems and day long FSCK sessions after power failures [1] or what 
> have you

I've both heard about and experienced first-hand data loss (pretty 
severe actually, some incidents pretty recent) with XFS after power 
failure. It used to be great for performance (not so great now that Ext4 
is on the rise), but reliability was never its strong point. The bias on 
this list is surprising and unjustified.

FWIW, I was at SGI when XFS for Linux was released, and I probably was 
among its first users. It was great back then, but now it's over-rated.

-- 
Florin Andrei

http://florin.myip.org
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Re: [CentOS] Is ext4 safe for a production server?

[Ian Forde]

On Dec 7, 2009, at 10:30 AM, Florin Andrei   
wrote:

> John R Pierce wrote:
>>
>> I've always avoided XFS because A) it wsan't supported natively in  
>> RHEL
>> anyways, and B) I've heard far too many stories about catastrophic  
>> loss
>> problems and day long FSCK sessions after power failures [1] or what
>> have you
>
> I've both heard about and experienced first-hand data loss (pretty
> severe actually, some incidents pretty recent) with XFS after power
> failure. It used to be great for performance (not so great now that  
> Ext4
> is on the rise), but reliability was never its strong point. The  
> bias on
> this list is surprising and unjustified.

Given that I stated my experience with XFS, and my rationale for using  
it in *my* production environment, I take exception to your calling  
said experience unjustified.


> FWIW, I was at SGI when XFS for Linux was released, and I probably was
> among its first users. It was great back then, but now it's over- 
> rated.
>
> -- 
> Florin Andrei
>
> http://florin.myip.org
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Re: [CentOS] Is ext4 safe for a production server?

[Les Mikesell]

Florin Andrei wrote:
> John R Pierce wrote:
>> I've always avoided XFS because A) it wsan't supported natively in RHEL 
>> anyways, and B) I've heard far too many stories about catastrophic loss 
>> problems and day long FSCK sessions after power failures [1] or what 
>> have you
> 
> I've both heard about and experienced first-hand data loss (pretty 
> severe actually, some incidents pretty recent) with XFS after power 
> failure. It used to be great for performance (not so great now that Ext4 
> is on the rise), but reliability was never its strong point. The bias on 
> this list is surprising and unjustified.

Everyone on this list is somewhat accustomed to ignoring reports of bugs 
that are known to be fixed in current versions. Is there some reason to 
think that the current XFS on 64-bit Linux is more fragile or less well 
tested than ext4?

-- 
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[CentOS] how to do startup scripts?

[Roland Roland]

Hello,

I've just finished installing Atlassian's bamboo 
it comes with two ways to start it up one through a bash shell script bamboo.sh
and another through java script (this one is better as it has the ability to 
start up the service if it got shutdown for any reason)

so I'm wondering how can I set this service to start on boot..
I know how to set a script on login in my profile though not on boot..

any suggestion?
I've looked around about none interactive shells and so on.. so if I did a 
symbolic link from bamboo.sh script to /etc/init.d would that work?
what about variables inside the script would they b read ? 

obviously a newbie here so appreciate any detailed explanation if possible 
about interactive/ none interactive shells and of course if theres an advice 
about how to solve this issue..

PS: trying to educate myself about linux along the way so any explanation would 
be greatly appreciated...


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Re: [CentOS] how to do startup scripts?

[Joseph L. Casale]

>any suggestion?
>I've looked around about none interactive shells and so on.. so if I did a 
>symbolic link from bamboo.sh script to /etc/init.d would that work?
>what about variables inside the script would they b read ?

Well, you can add an entry for that shell script to rc.local (unsexy).

Open a copy of an existing init script, and start hacking (sexy).

Wait till rhel moves away from that archaic sys v like stuff into a more 
intelligent
system like smf (super lusty) but that might be a while:)

jlc
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Re: [CentOS] how to do startup scripts?

[James Hogarth]

Depending on the script placing it in /etc/init.d could work (with
appropriate symlinks to /etc/rc.x) however does the script follwo standard
behaviour for /etc/init.d scripts? (eg start, stop, restart, status.)


If you just want the script/java file called you could just pop it into
/etc/rc.local to run at the end of the start up sequence (you might need to
& to background it) ... with the reminder that it will only run at startup
then. To run it at other times you would need nohup  &

that would prevent it ending when you log out or you close a terminal window
(thus exiting the parent shell).

2009/12/7 Roland Roland 

>  Hello,
>
> I've just finished installing Atlassian's bamboo
> 
> it comes with two ways to start it up one through a bash shell script
> bamboo.sh
> and another through java script (this one is better as it has the ability
> to start up the service if it got shutdown for any reason)
>
> so I'm wondering how can I set this service to start on boot..
> I know how to set a script on login in my profile though not on boot..
>
> any suggestion?
> I've looked around about none interactive shells and so on.. so if I did a
> symbolic link from bamboo.sh script to /etc/init.d would that work?
> what about variables inside the script would they b read ?
>
> obviously a newbie here so appreciate any detailed explanation if possible
> about interactive/ none interactive shells and of course if theres an advice
> about how to solve this issue..
>
> PS: trying to educate myself about linux along the way so any explanation
> would be greatly appreciated...
>
>
>
>
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[CentOS] firefox-3.0.15 on CentOS 4

[Agile Aspect]

Hi - I updated firefox-3.0.5  from  firefox-3.0.15on CentOS 4 this
weekend and now I can't start it  because it has the wrong version
of NSS and I can't update NSS to the correct version.

Does anyone know where I can find the RPM for CentOS 4 version
of firefox-3.0.5?

Or how I can tell yum to install version firefox-3.0.5 instead of
firefox-3.0.15?

Thank you.

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Re: [CentOS] how to do startup scripts?

[John R Pierce]

Roland Roland wrote:
> Hello,
>  
> I've just finished installing Atlassian's bamboo 
> 
> it comes with two ways to start it up one through a bash shell script 
> bamboo.sh
> and another through java script (this one is better as it has the 
> ability to start up the service if it got shutdown for any reason)
>  
> so I'm wondering how can I set this service to start on boot..
> I know how to set a script on login in my profile though not on boot..
>  
> any suggestion?
> I've looked around about none interactive shells and so on.. so if I 
> did a symbolic link from bamboo.sh script to /etc/init.d would that work?
> what about variables inside the script would they b read ?
>  
> obviously a newbie here so appreciate any detailed explanation if 
> possible about interactive/ none interactive shells and of course if 
> theres an advice about how to solve this issue..
>  
> PS: trying to educate myself about linux along the way so any 
> explanation would be greatly appreciated...

you need to write a script for /etc/init.d that takes an argument 
"stop", "start", and optionally "restart" and/or "reload".

this script can either call that bamboo.sh script or just contain a copy 
of it as the 'start' part (I'd go with the latter if its really simple)

do remember, you have to set up any environment this process may needmay 
need.  DO NOT ASSUME ANY LOGIN ENVIRONMENT.

Take a look at /etc/init.d/smartd  as an example init script, as this is 
a fairly simple one.

your script should have a comment on top something like...

#!/bin/sh
#
# bamboo   Starts the bamboo service
#
# chkconfig:   345 05 95
# description:   blahblah blahdablah blah
# 

the important line there is chkconfig:   whihc in this case says, by 
default you want this service run at run levels 3,4,5, and it is to be 
started at priority 05 and stopped at priority 95
(lower means sooner ni the order of things)

after putting that script in /etc/init.d, then...

service bamboo {start|stop}

will manuallly start/stop this service, and

chkconfig bamboo on

and that will configure it to run at startup per those chkconfig options.

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Re: [CentOS] firefox-3.0.15 on CentOS 4

[Agile Aspect]

Opps - on CentOS 4 I upgrade from firefox-3.0.5 to firefox-3.0.15 and now I
need to back out to version firefox-3.0.5.

On Mon, Dec 7, 2009 at 12:09 PM, Agile Aspect  wrote:
> Hi - I updated firefox-3.0.5  from  firefox-3.0.15on CentOS 4 this
> weekend and now I can't start it  because it has the wrong version
> of NSS and I can't update NSS to the correct version.
>
> Does anyone know where I can find the RPM for CentOS 4 version
> of firefox-3.0.5?
>
> Or how I can tell yum to install version firefox-3.0.5 instead of
> firefox-3.0.15?
>
> Thank you.
>
> --
>      Enjoy global warming while it lasts.
>



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Re: [CentOS] how to do startup scripts?

[Gary L. Greene, Jr.]

On Monday 07 December 2009 12:10:50 pm John R Pierce wrote:
> Roland Roland wrote:
> > Hello,
> >
> > I've just finished installing Atlassian's bamboo
> > 
> > it comes with two ways to start it up one through a bash shell script
> > bamboo.sh
> > and another through java script (this one is better as it has the
> > ability to start up the service if it got shutdown for any reason)
> >
> > so I'm wondering how can I set this service to start on boot..
> > I know how to set a script on login in my profile though not on boot..
> >
> > any suggestion?
> > I've looked around about none interactive shells and so on.. so if I
> > did a symbolic link from bamboo.sh script to /etc/init.d would that work?
> > what about variables inside the script would they b read ?
> >
> > obviously a newbie here so appreciate any detailed explanation if
> > possible about interactive/ none interactive shells and of course if
> > theres an advice about how to solve this issue..
> >
> > PS: trying to educate myself about linux along the way so any
> > explanation would be greatly appreciated...
> 
> you need to write a script for /etc/init.d that takes an argument
> "stop", "start", and optionally "restart" and/or "reload".
> 
> this script can either call that bamboo.sh script or just contain a copy
> of it as the 'start' part (I'd go with the latter if its really simple)
> 
> do remember, you have to set up any environment this process may needmay
> need.  DO NOT ASSUME ANY LOGIN ENVIRONMENT.
> 
> Take a look at /etc/init.d/smartd  as an example init script, as this is
> a fairly simple one.
> 
> your script should have a comment on top something like...
> 
> #!/bin/sh
> #
> # bamboo   Starts the bamboo service
> #
> # chkconfig:   345 05 95
> # description:   blahblah blahdablah blah
> # 
> 
> the important line there is chkconfig:   whihc in this case says, by
> default you want this service run at run levels 3,4,5, and it is to be
> started at priority 05 and stopped at priority 95
> (lower means sooner ni the order of things)
> 
> after putting that script in /etc/init.d, then...
> 
> service bamboo {start|stop}
> 
> will manuallly start/stop this service, and
> 
> chkconfig bamboo on
> 
> and that will configure it to run at startup per those chkconfig options.
> 
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> 

Good documentation for this lives in the following directory:

/usr/share/doc/initscripts-/sysconfig.txt

The  should be replaced with the version string of the initscripts 
rpm found by running 'rpm -q initscripts --format %{VERSION} && echo' at the 
terminal.

-- 
Gary L. Greene, Jr.
IT Operations
Minerva Networks, Inc.
Cell:  (650) 704-6633
Phone: (408) 240-1239
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Re: [CentOS] how to do startup scripts?

[Les Mikesell]

Roland Roland wrote:
>
> I've just finished installing Atlassian's bamboo 
> 
> it comes with two ways to start it up one through a bash shell script 
> bamboo.sh
> and another through java script (this one is better as it has the 
> ability to start up the service if it got shutdown for any reason)
>  
> so I'm wondering how can I set this service to start on boot..
> I know how to set a script on login in my profile though not on boot..
>  
> any suggestion?
> I've looked around about none interactive shells and so on.. so if I did 
> a symbolic link from bamboo.sh script to /etc/init.d would that work?
> what about variables inside the script would they b read ?
>  
> obviously a newbie here so appreciate any detailed explanation if 
> possible about interactive/ none interactive shells and of course if 
> theres an advice about how to solve this issue..
>  
> PS: trying to educate myself about linux along the way so any 
> explanation would be greatly appreciated...

Others have covered the init script conventions, so I'll just suggest 
looking at Hudson (http://hudson-ci.org/) as a free alternative that you 
can get RPM-packaged or just drop the war file under the stock Centos 
tomcat.

-- 
   Les Mikesell
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Re: [CentOS] Is ext4 safe for a production server?

[Peter Kjellstrom]

On Monday 07 December 2009, Florin Andrei wrote:
> John R Pierce wrote:
> > I've always avoided XFS because A) it wsan't supported natively in RHEL
> > anyways, and B) I've heard far too many stories about catastrophic loss
> > problems and day long FSCK sessions after power failures [1] or what
> > have you
>
> I've both heard about and experienced first-hand data loss (pretty
> severe actually, some incidents pretty recent)

I'm sorry for your losses. That said, we've run many servers (100+) using many 
CentOS versions over the years and I don't know of one case of XFS caused 
data loss. For us XFS has always performed well and "just worked".

Our initial reason for using XFS over EXT3 was write performance on certain 
RAID-controllers but lately it's also about scalability (file system size).

> with XFS after power 
> failure. It used to be great for performance (not so great now that Ext4
> is on the rise),

I am looking forward to EXT4, but it is currently a tech. preview (compared to 
XFS "proven for many years")...

Just my €0.02,
 Peter

> but reliability was never its strong point. The bias on 
> this list is surprising and unjustified.
>
> FWIW, I was at SGI when XFS for Linux was released, and I probably was
> among its first users. It was great back then, but now it's over-rated.


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Re: [CentOS] firefox-3.0.15 on CentOS 4

[m . roth]

> Opps - on CentOS 4 I upgrade from firefox-3.0.5 to firefox-3.0.15 and now
> I need to back out to version firefox-3.0.5.
>
> On Mon, Dec 7, 2009 at 12:09 PM, Agile Aspect 
> wrote:
>> Hi - I updated firefox-3.0.5  from  firefox-3.0.15on CentOS 4 this
>> weekend and now I can't start it  because it has the wrong version
>> of NSS and I can't update NSS to the correct version.
>>
>> Does anyone know where I can find the RPM for CentOS 4 version
>> of firefox-3.0.5?
>>
>> Or how I can tell yum to install version firefox-3.0.5 instead of
>> firefox-3.0.15?

I literally a minute ago upgraded my firefox from 3.5.3 to 3.5.5. I
*always* do it as follows:
as root, cd to where it's installed (for me, /opt)
rm firefox
bunzip2 /whereIsavedit/firefox.tar.bz2
tar -xvf /whereIsavedit/firefox.tar
mv firefox firefox-
ln -s firefox- firefox

Then I have my link in /usr/bin/firefox pointing to, in my case,
/opt/firefox/firefox.

Back out? No problem, reset the symbolic link.

In your case, first, was it installed via rpm? If so, rpm -e; in my case, 
rm -r the directory it was installed in, then go to the mozilla site and
d/l the version you want, then follow my procedure, above.

If you insist on installing it via yum, or rpm, you can tell it a release
number - check the man page on those.

mark

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Re: [CentOS] firefox-3.0.15 on CentOS 4

[Agile Aspect]

I'm using yum and I when I specify the version if comes back
with nothing to install.

Hence the request for the RPM.

I found the RPM in the http://mirror.centos.org/centos-4 mirror.

Thanks for the reply.


On Mon, Dec 7, 2009 at 12:27 PM,   wrote:
>> Opps - on CentOS 4 I upgrade from firefox-3.0.5 to firefox-3.0.15 and now
>> I need to back out to version firefox-3.0.5.
>>
>> On Mon, Dec 7, 2009 at 12:09 PM, Agile Aspect 
>> wrote:
>>> Hi - I updated firefox-3.0.5  from  firefox-3.0.15on CentOS 4 this
>>> weekend and now I can't start it  because it has the wrong version
>>> of NSS and I can't update NSS to the correct version.
>>>
>>> Does anyone know where I can find the RPM for CentOS 4 version
>>> of firefox-3.0.5?
>>>
>>> Or how I can tell yum to install version firefox-3.0.5 instead of
>>> firefox-3.0.15?
>
> I literally a minute ago upgraded my firefox from 3.5.3 to 3.5.5. I
> *always* do it as follows:
> as root, cd to where it's installed (for me, /opt)
> rm firefox
> bunzip2 /whereIsavedit/firefox.tar.bz2
> tar -xvf /whereIsavedit/firefox.tar
> mv firefox firefox-
> ln -s firefox- firefox
>
> Then I have my link in /usr/bin/firefox pointing to, in my case,
> /opt/firefox/firefox.
>
> Back out? No problem, reset the symbolic link.
>
> In your case, first, was it installed via rpm? If so, rpm -e; in my case,
> rm -r the directory it was installed in, then go to the mozilla site and
> d/l the version you want, then follow my procedure, above.
>
> If you insist on installing it via yum, or rpm, you can tell it a release
> number - check the man page on those.
>
>        mark
>
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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Lucian @ lastdot.org]

On Mon, Dec 7, 2009 at 12:24 PM, Diederick Stoffers
 wrote:
> [r...@localhost ~]# uname -a
> Linux localhost.localdomain 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3 16:48:13
> EST 2009 x86_64 x86_64 x86_64 GNU/Linux
>
> On 7 dec 2009, at 13:12, Rudi Ahlers wrote:
>
> what kernel are you running?
>
> On Mon, Dec 7, 2009 at 2:05 PM, Diederick Stoffers 
> wrote:
>
> Hi,
>
> We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 64
>
> bits version of Fedora 12 lists the correct amount of 128GB, CentOS only
>
> finds 32GB (and so does Scientific Linux). I would much prefer to use CentOS
>
> (most of the software we use is specifically designed for CentOS). Does
>
> anyone know what is causing this/how to fix it?
>
> Many Thanks,
>
> Diederick
>
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>
>
>
>
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> Web: http://www.SoftDux.com
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>

Try to run xentop (xm top) and see if it displays the correct ammount of memory.
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Re: [CentOS] CentOS 5.4 x86_64 only detects 32GB RAM while Fedora x86_64 correctly lists 128GB

[Jake]

On Mon, Dec 7, 2009 at 4:35 PM, Lucian @ lastdot.org wrote:

> On Mon, Dec 7, 2009 at 12:24 PM, Diederick Stoffers
>  wrote:
> > [r...@localhost ~]# uname -a
> > Linux localhost.localdomain 2.6.18-164.6.1.el5xen #1 SMP Tue Nov 3
> 16:48:13
> > EST 2009 x86_64 x86_64 x86_64 GNU/Linux
> >
> > On 7 dec 2009, at 13:12, Rudi Ahlers wrote:
> >
> > what kernel are you running?
> >
> > On Mon, Dec 7, 2009 at 2:05 PM, Diederick Stoffers  >
> > wrote:
> >
> > Hi,
> >
> > We have a new 24-core Dell PowerEdge R905 server with 128GB's RAM. The 64
> >
> > bits version of Fedora 12 lists the correct amount of 128GB, CentOS only
> >
> > finds 32GB (and so does Scientific Linux). I would much prefer to use
> CentOS
> >
> > (most of the software we use is specifically designed for CentOS). Does
> >
> > anyone know what is causing this/how to fix it?
> >
> > Many Thanks,
> >
> > Diederick
>

From:
http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Virtualization-en-US/ch-virt-hw-support.html


"The Red Hat Enterprise Linux Virtualization kernel does not support more
than 32GB of memory for x86_64 systems. If you need to boot the
virtualization kernel on systems with more than 32GB of physical memory
installed, you must append the kernel command line with mem=32G. This
example shows how to enable the proper parameters in the grub.conf file:

title Red Hat Enterprise Linux Server  (2.6.18-4.elxen)
root  (hd0, 0)
kernel   /xen.gz-2.6.18-4-el5 mem=32G
module   /vmlinuz -2.6.18-4.el5xen ro root=LABEL=/
module   /initrd-2.6.18-4.el5xen.img"


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[CentOS] how to find last updates for Centos 5.3?

[Paul Johnson]

I'm setting up a Rocks Cluster Linux system
 using Centos 5.3 as the OS.  Rocks is
an organizing framework for multi node systems, it tries to
orchestrate kickstart installs across many systems and interaction
among those many systems as a compute cluster.

One problem with administering these systems is that the OS updates
can break the Rocks framework.  I've tried Rocks with Centos5.4, but
there is some incompatability.  The Rocks system is based on Centos
5.2, it tolerates 5.3, but not 5.4.  The Rocks experts seem to
discourage us from making any RPM package updates, but I'm
adventuresome enough to think that I can at least try to make some
selective updates.

I wish I had access to a Centos update folder AS IT EXISTED before
Centos 5.4 was released.  The last update set that applied to 5.3,in
other words.  But I can't figure how to get that, because Centos
servers just have the current updates under a folder marked 5.  If I
try to update against the current 5 server, it will pull in lots and
lots of new RPMS from the Centos base, and I don't want that.

I can't afford the risk of updating against the current Centos
offerings because Rocks might not work anymore, or so I'm told by the
Rocks experts.

Any ideas about how to go back in time and get the last 5.3 update batch??

pj

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Re: [CentOS] how to find last updates for Centos 5.3?

[Alan McKay]

> I wish I had access to a Centos update folder AS IT EXISTED before
> Centos 5.4 was released.  The last update set that applied to 5.3,in
> other words.

Crap, I just removed one with no backups.



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 - Michael Pollan, author of "In Defense of Food"
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Re: [CentOS] how to find last updates for Centos 5.3?

[Alan McKay]

On Mon, Dec 7, 2009 at 6:00 PM, Alan McKay  wrote:
>> I wish I had access to a Centos update folder AS IT EXISTED before
>> Centos 5.4 was released.  The last update set that applied to 5.3,in
>> other words.
>
> Crap, I just removed one with no backups.

Actually, nope, I still have a copy.All 18G of it.

Not sure what would be the best way to get it to you if you cannot
find it elsewhere.


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[CentOS] how to find last updates for Centos 5.3?

[R P Herrold]

On Mon, 7 Dec 2009, Alan McKay wrote:

>> I wish I had access to a Centos update folder AS IT EXISTED before
>> Centos 5.4 was released.  The last update set that applied to 5.3,in
>> other words.
>
> Crap, I just removed one with no backups.

and 1) as it was partially inconsistent with upstream, and 
prior practice, as some items were pushed 'early' compared to 
prior release processes, and
 2) since vault.centos.org  has all, with datestamps to 
permit building any particular point in time variant,

... this is important just how?

-- Russ herrold
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Re: [CentOS] how to find last updates for Centos 5.3?

[Lars Hecking]

> Any ideas about how to go back in time and get the last 5.3 update batch??

 Grab a copy of centos/5.3/updates along with centos/5.3/os from your
 nearest CentOS mirror and set up your own local repository.


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Re: [CentOS] how to find last updates for Centos 5.3?

[Greg Bailey]

Paul Johnson wrote:
> I wish I had access to a Centos update folder AS IT EXISTED before
> Centos 5.4 was released.  The last update set that applied to 5.3,in
> other words.  But I can't figure how to get that, because Centos
> servers just have the current updates under a folder marked 5.  If I
> try to update against the current 5 server, it will pull in lots and
> lots of new RPMS from the Centos base, and I don't want that.
>
> Any ideas about how to go back in time and get the last 5.3 update batch??
>
> pj
>
>   

Looks like the mirror sites still have the 5.3 updates at (for x86):

http://mirror.centos.org/centos/5.3/updates/i386/RPMS/

so I imagine you could manually edit the 
/etc/yum.repos.d/CentOS-Base.repo file and put "5.3" in there explicitly.

Usually, though, old versions like 5.3 are eventually removed from the 
regular mirror servers and moved to the "vault" site, where you'd be 
able to access it via:

http://vault.centos.org/5.3/

once it's moved there (not populated at present).

-Greg

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Re: [CentOS] how to find last updates for Centos 5.3?

[John R Pierce]

Lars Hecking wrote:
>> Any ideas about how to go back in time and get the last 5.3 update batch??
>> 
>
>  Grab a copy of centos/5.3/updates along with centos/5.3/os from your
>  nearest CentOS mirror and set up your own local repository.
>   

thats been purged from the mirrors.


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Re: [CentOS] how to find last updates for Centos 5.3?

[Brian Mathis]

On Mon, Dec 7, 2009 at 6:12 PM, John R Pierce  wrote:
> Lars Hecking wrote:
>>> Any ideas about how to go back in time and get the last 5.3 update batch??
>>>
>>
>>  Grab a copy of centos/5.3/updates along with centos/5.3/os from your
>>  nearest CentOS mirror and set up your own local repository.
>>
>
> that's been purged from the mirrors.
>


Not true, and it's the thing that's most irritating about this policy.
 The RPMs are still there, just not the sqlite repodata files that yum
needs.  So if you got to a mirror, you can see all of the files, but
yum doesn't work.

The only way is to make your own repo.  You need to mirror the files
you want, then install "createrepo".  After you've got that installed:
cd centos/5.3
for dir in */x86_64/ */i386/
do
createrepo --database $dir
done

Then you can make a new repo file in /etc/yum.repos.d pointing to your
new location.
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Re: [CentOS] how to find last updates for Centos 5.3?

[Brian Mathis]

On Mon, Dec 7, 2009 at 6:03 PM, R P Herrold  wrote:
> On Mon, 7 Dec 2009, Alan McKay wrote:
>
>>> I wish I had access to a Centos update folder AS IT EXISTED before
>>> Centos 5.4 was released.  The last update set that applied to 5.3,in
>>> other words.
>>
>> Crap, I just removed one with no backups.
>
> and 1) as it was partially inconsistent with upstream, and
> prior practice, as some items were pushed 'early' compared to
> prior release processes, and
>     2) since vault.centos.org  has all, with datestamps to
> permit building any particular point in time variant,
>
> ... this is important just how?
>
> -- Russ herrold

2) 5.3 is NOT on the vault.

3) This is important for the reasons the OP described in his post.
Just because you may already know the answer does not make it
unimportant to the OP.
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Re: [CentOS] how to find last updates for Centos 5.3?

[Karanbir Singh]

On 07/12/09 23:19, Brian Mathis wrote:
> Not true, and it's the thing that's most irritating about this policy.
>   The RPMs are still there, just not the sqlite repodata files that yum
> needs.  So if you got to a mirror, you can see all of the files, but
> yum doesn't work.


well, Brian - you seem to be looking in the wrong place, also you are 
mistaken about requirements for sqlite data. So, here is where it stands:

5.3 has not been moved to vault.c.o as yet, due to disk space issues, we 
should have that resolved in the next few weeks. Once its moved, it will 
exist there for as long as we are able to keep it ( we still have all of 
2.1 / 3.* / 4.* and 5.* so far )

all metadata for 5.3 is still available in the right place. eg:
http://mirror.centos.org/centos/5.3/updates/i386/repodata/
http://mirror.centos.org/centos/5.3/os/i386/repodata/

Every release ever done by CentOS stays public, and we make every effort 
to keep atleast the binary and source files available ( so this 
best-effort-warranty does not extend to debuginfo pkgs ).

hth

- KB
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[CentOS] Xorg goes bonkers, bazillion NVIDIA errors...

[fred smith]

on one of my Centos 5.4 boxes, a machine that's around 5 years old and
has always run Centos and X, and has had the same Nvidia card in it for
its entire life, I'm suddenly getting these lines in the xorg log file:

(WW) NVIDIA(0): WAIT (2, 6, 0x8000, 0x, 0x03c0)
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***
(EE) NVIDIA(0): Failed to allocate clip rectangle
(EE) NVIDIA(0):  *** Aborting ***

followed by millions more like them. it's currently sitting mostly
unused, except that it's running a Folding At Home client. it'll run
for a day or a week then I'll note the screen is in powersave mode, will
attempt to wake it up by moving the mouse or touching a key and nothing
happens. (for purposes of this testing I've disabled the screensaver,
so the screen should never shut off.) I can SOMETIMES ssh into it, if
it hasn't completely died yet, and if I can, top shows that Xorg is
consuming about 99% of the CPU instead of the folding at home client
which should be consuming most of it. I guess it's busy spewing errors
to the Xorg log file, or something.

The last time I found it like this I tried to kill xorg. kill -15 wouldn't
kill it so I tried kill -9, then the whole box seized up, requiring a
reset.

sometimes it's already unresponsive, even to ssh or ping, by the time I
notice the problem.

it's running an old Nvidia Geforce 4 MX400 card and the Nvidia proprietary
driver NVIDIA-Linux-x86-96.43.01-pkg1.run, downloaded directly from the 
nvidia web site. the date on that file is Oct 2007, so that means that's
the one that it has been using since then. but it's only the last 6 weeks
or so it's started doing this.

other than some vaguely-defined "nvidia driver problems", what may be
going on here?  (I can buy an nvidia conflict with the stock centos
kernel, but I'd be dubious, since it's been running this driver for
two years and earlier versions for 4 or 5. any such conflict would seem
likely a kernel issue, to me, since it's newly exhibited.)

Thanks!

Fred
-- 
 Fred Smith -- fre...@fcshome.stoneham.ma.us -
   But God demonstrates his own love for us in this: 
 While we were still sinners, 
  Christ died for us.
--- Romans 5:8 (niv) --
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Re: [CentOS] Xorg goes bonkers, bazillion NVIDIA errors...

[Robert Heller]

At Mon, 7 Dec 2009 18:58:40 -0500 CentOS mailing list  wrote:

> 
> on one of my Centos 5.4 boxes, a machine that's around 5 years old and
> has always run Centos and X, and has had the same Nvidia card in it for
> its entire life, I'm suddenly getting these lines in the xorg log file:
> 
> (WW) NVIDIA(0): WAIT (2, 6, 0x8000, 0x, 0x03c0)
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> (EE) NVIDIA(0): Failed to allocate clip rectangle
> (EE) NVIDIA(0):  *** Aborting ***
> 
> followed by millions more like them. it's currently sitting mostly
> unused, except that it's running a Folding At Home client. it'll run
> for a day or a week then I'll note the screen is in powersave mode, will
> attempt to wake it up by moving the mouse or touching a key and nothing
> happens. (for purposes of this testing I've disabled the screensaver,
> so the screen should never shut off.) I can SOMETIMES ssh into it, if
> it hasn't completely died yet, and if I can, top shows that Xorg is
> consuming about 99% of the CPU instead of the folding at home client
> which should be consuming most of it. I guess it's busy spewing errors
> to the Xorg log file, or something.
> 
> The last time I found it like this I tried to kill xorg. kill -15 wouldn't
> kill it so I tried kill -9, then the whole box seized up, requiring a
> reset.
> 
> sometimes it's already unresponsive, even to ssh or ping, by the time I
> notice the problem.
> 
> it's running an old Nvidia Geforce 4 MX400 card and the Nvidia proprietary
> driver NVIDIA-Linux-x86-96.43.01-pkg1.run, downloaded directly from the 
> nvidia web site. the date on that file is Oct 2007, so that means that's
> the one that it has been using since then. but it's only the last 6 weeks
> or so it's started doing this.
> 
> other than some vaguely-defined "nvidia driver problems", what may be
> going on here?  (I can buy an nvidia conflict with the stock centos
> kernel, but I'd be dubious, since it's been running this driver for
> two years and earlier versions for 4 or 5. any such conflict would seem
> likely a kernel issue, to me, since it's newly exhibited.)

Random thoughts: it is possible that the video card has 'died' on some
level -- such as its on-board memory is developing errors or some
component has shifted out of spec, etc.  Does the card have a fan on it
(some video cards have little processor elements with heat sinks AND
fans).  Is the card covered in a thick layer of dust (and thus not
being cooled properly)?  Are all of the case fans on this '5 year old
box' working?  Is the PSU still in spec?  Is its fan working? I'd try
cracking the case and have a serious visit with Mr. Vacume Cleaner. 
Then powering it back up (with the case cover off) and checking to see
if the fans are *all* working.

> 
> Thanks!
> 
> Fred

-- 
Robert Heller -- 978-544-6933
Deepwoods Software-- Download the Model Railroad System
http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
hel...@deepsoft.com   -- http://www.deepsoft.com/ModelRailroadSystem/
   
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Re: [CentOS] Xorg goes bonkers, bazillion NVIDIA errors...

[nate]

fred smith wrote:

> other than some vaguely-defined "nvidia driver problems", what may be
> going on here?  (I can buy an nvidia conflict with the stock centos
> kernel, but I'd be dubious, since it's been running this driver for
> two years and earlier versions for 4 or 5. any such conflict would seem
> likely a kernel issue, to me, since it's newly exhibited.)

hardware going bad? Is the card active or passively cooled?

Try the latest driver? Have any other cards that are the same model# you
could try in that box?

nate



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Re: [CentOS] Xorg goes bonkers, bazillion NVIDIA errors...

[fred smith]

On Mon, Dec 07, 2009 at 07:24:01PM -0500, Robert Heller wrote:
> At Mon, 7 Dec 2009 18:58:40 -0500 CentOS mailing list  
> wrote:
> 
> > 
> > on one of my Centos 5.4 boxes, a machine that's around 5 years old and
> > has always run Centos and X, and has had the same Nvidia card in it for
> > its entire life, I'm suddenly getting these lines in the xorg log file:
> > 
> > (WW) NVIDIA(0): WAIT (2, 6, 0x8000, 0x, 0x03c0)
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > (EE) NVIDIA(0): Failed to allocate clip rectangle
> > (EE) NVIDIA(0):  *** Aborting ***
> > 
> > followed by millions more like them. it's currently sitting mostly
> > unused, except that it's running a Folding At Home client. it'll run
> > for a day or a week then I'll note the screen is in powersave mode, will
> > attempt to wake it up by moving the mouse or touching a key and nothing
> > happens. (for purposes of this testing I've disabled the screensaver,
> > so the screen should never shut off.) I can SOMETIMES ssh into it, if
> > it hasn't completely died yet, and if I can, top shows that Xorg is
> > consuming about 99% of the CPU instead of the folding at home client
> > which should be consuming most of it. I guess it's busy spewing errors
> > to the Xorg log file, or something.
> > 
> > The last time I found it like this I tried to kill xorg. kill -15 wouldn't
> > kill it so I tried kill -9, then the whole box seized up, requiring a
> > reset.
> > 
> > sometimes it's already unresponsive, even to ssh or ping, by the time I
> > notice the problem.
> > 
> > it's running an old Nvidia Geforce 4 MX400 card and the Nvidia proprietary
> > driver NVIDIA-Linux-x86-96.43.01-pkg1.run, downloaded directly from the 
> > nvidia web site. the date on that file is Oct 2007, so that means that's
> > the one that it has been using since then. but it's only the last 6 weeks
> > or so it's started doing this.
> > 
> > other than some vaguely-defined "nvidia driver problems", what may be
> > going on here?  (I can buy an nvidia conflict with the stock centos
> > kernel, but I'd be dubious, since it's been running this driver for
> > two years and earlier versions for 4 or 5. any such conflict would seem
> > likely a kernel issue, to me, since it's newly exhibited.)
> 
> Random thoughts: it is possible that the video card has 'died' on some
> level -- such as its on-board memory is developing errors or some
> component has shifted out of spec, etc.  Does the card have a fan on it
> (some video cards have little processor elements with heat sinks AND
> fans).  Is the card covered in a thick layer of dust (and thus not
> being cooled properly)?  Are all of the case fans on this '5 year old
> box' working?  Is the PSU still in spec?  Is its fan working? I'd try
> cracking the case and have a serious visit with Mr. Vacume Cleaner. 
> Then powering it back up (with the case cover off) and checking to see
> if the fans are *all* working.

it's actually a brand new PS. I had to steal the PS from this computer
for another more critical one whose PS up and died. Did some research
and found that the 500W Antec Basiq 500 was alleged to be a good one for
being modestly priced, so I bought one (the original PS was also an Antec,
350W, and it ran flawlessly for all those years). the trouble did appear
a while afterthat, so it could be something weird about the PS. I don't
have a 'scope to view the noise levels of the output, but at least the
voltages all look good on my DVM while under "normal" load.

the video card does have a fan, I'll have to look at it again--last
time I checked it was running fine. there are actually six fans in the
computer, and all were fine at last check.

little dirt in it--there's a filter on the intake in front (with a
120mm intake fan) that I cleaned while I had it apart to steal its
PS, and mopped up what other loose filth I could find. mostly, the
collection of cat fur on the input filter nicely blocked smaller bits
of dust from entering. :) It usually gets opened up and the fur cleaned
out twice a year, more or less.

> 
> > 
> > Thanks!
> > 
> > Fred
> 
> -- 
> Robert Heller -- 978-544-6933
> Deepwoods Software-- Download the Model Railroad System
> http://www.deepsoft.com/  -- Binaries for Linux and MS-Windows
> hel...@deepsoft.com   -- http://www.deepsoft.com/ModelRailroadSystem/
>

Re: [CentOS] Xorg goes bonkers, bazillion NVIDIA errors...

[fred smith]

On Mon, Dec 07, 2009 at 04:46:50PM -0800, nate wrote:
> fred smith wrote:
> 
> > other than some vaguely-defined "nvidia driver problems", what may be
> > going on here?  (I can buy an nvidia conflict with the stock centos
> > kernel, but I'd be dubious, since it's been running this driver for
> > two years and earlier versions for 4 or 5. any such conflict would seem
> > likely a kernel issue, to me, since it's newly exhibited.)
> 
> hardware going bad? Is the card active or passively cooled?

see otherposting about fans and PS. new PS. all fans working.

> 
> Try the latest driver? Have any other cards that are the same model# you
> could try in that box?
Hmm. not the same, but there is a spare higher-spec/newer nvidia card
around I could stick in it, also AGP, so it would fit.

-- 
 Fred Smith -- fre...@fcshome.stoneham.ma.us -
  "And he will be called Wonderful Counselor, Mighty God, Everlasting Father,
  Prince of Peace. Of the increase of his government there will be no end. He 
 will reign on David's throne and over his kingdom, establishing and upholding
  it with justice and righteousness from that time on and forever."
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Re: [CentOS] Is ext4 safe for a production server?

[Christopher Chan]

Florin Andrei wrote:
> John R Pierce wrote:
>> I've always avoided XFS because A) it wsan't supported natively in RHEL 
>> anyways, and B) I've heard far too many stories about catastrophic loss 
>> problems and day long FSCK sessions after power failures [1] or what 
>> have you
> 
> I've both heard about and experienced first-hand data loss (pretty 
> severe actually, some incidents pretty recent) with XFS after power 
> failure. It used to be great for performance (not so great now that Ext4 
> is on the rise), but reliability was never its strong point. The bias on 
> this list is surprising and unjustified.


Yes. Used XFS for a mail queue and once lost 4000 emails thanks to XFS's 
aggressive caching after a power loss before barriers were introduced. 
However, XFS now supports barriers and so, so long as you do not use lvm 
or you use hardware raid with a bbu cache and thus not needing to use 
barriers, you are safe.

> 
> FWIW, I was at SGI when XFS for Linux was released, and I probably was 
> among its first users. It was great back then, but now it's over-rated.
> 

For sure it is the most complicated filesystem in Linux with the largest 
block code.
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Re: [CentOS] Is ext4 safe for a production server?

[Christopher Chan]

Ian Forde wrote:
> On Dec 7, 2009, at 10:30 AM, Florin Andrei   
> wrote:
> 
>> John R Pierce wrote:
>>> I've always avoided XFS because A) it wsan't supported natively in  
>>> RHEL
>>> anyways, and B) I've heard far too many stories about catastrophic  
>>> loss
>>> problems and day long FSCK sessions after power failures [1] or what
>>> have you
>> I've both heard about and experienced first-hand data loss (pretty
>> severe actually, some incidents pretty recent) with XFS after power
>> failure. It used to be great for performance (not so great now that  
>> Ext4
>> is on the rise), but reliability was never its strong point. The  
>> bias on
>> this list is surprising and unjustified.
> 
> Given that I stated my experience with XFS, and my rationale for using  
> it in *my* production environment, I take exception to your calling  
> said experience unjustified.
> 

The thing is that none of you ever stated how XFS was used. With 
hardware raid or software raid or lvm or memory disk...

Anyway, data loss issues today should come down to not setting up 
properly. Like disabling barriers on disks that have their write cache 
enabled.
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[CentOS] Does CentOS provide commerical support ?

[premrajm]

Hi ,

I wanted to know about any commercial support for centOS 5.3 like kernel 
customization and others from centOS community or developers. Please 
provide information on the same

Regards,
Premraj M



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Re: [CentOS] Does CentOS provide commerical support ?

[Rudi Ahlers]

On Tue, Dec 8, 2009 at 7:19 AM,   wrote:
>
> Hi ,
>
> I wanted to know about any commercial support for centOS 5.3 like kernel
> customization and others from centOS community or developers. Please provide
> information on the same
>
> Regards,
> Premraj M
>
>


If I'm not mistaken, this is where Redhat comes to play. They offer
the Commercial support. CentOS is based on Redhat, without te
commercial support.


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Office: 087 805 9573
Cell: 082 554 7532
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Re: [CentOS] Does CentOS provide commerical support ?

[Neil Aggarwal]

> > I wanted to know about any commercial support for centOS 
> 5.3 like kernel
> > customization

> If I'm not mistaken, this is where Redhat comes to play.

Will RedHat compile a custom kernel for one user?
I think they are too large an organization for that.

I think the OP is looking for a consultant from the CentOS
community to edit source code and create a custome kernel.
There have to be people on this (or the developers) list
that can do that for him.

Neil

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