Re: [CentOS] New kernel causes hardware error?

[Michael Schumacher]

Eric,

On Tuesday, June 22, 2010 you wrote:

> I have recently upgraded to 2.6.18-194.3.1.el5 and within several days
> the machine crashed with the following error (repeating in mcelog):

[...]

> Would this error indicate a motherboard or CPU problem? How can I 
> diagnose? or is there something funny with the Kernel?

I ran across the same problem some time ago. At that time the kernel
was updated to recognize a new chip set (the one I use). The errors
appeared with the new kernel, but of course they were there
(undetected) before. I was checking CPU, memory and finally main board
and it turned out that my TYAN board was faulty.
You may want to google the error message. I found the exact error
string to appear in the new kernel version for the first time.


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Re: [CentOS] New kernel causes hardware error?

[Tsuyoshi Nagata]

Hi! Eric
(2010/06/22 13:11), Eric Deis wrote:
> Transaction: Address/Command error

Its mother board (memory controller) problem.
Its *not* DIMM problem.(memtest can't detect this error.)
your data transfer(read/write) sometimes met bit errors.
This is Nehalem cpu's error detecting feature.(MCE)

Try new mother board,
or your MB always indicates this error in latest kernel,
Its time to buy certified vendors hardware.

Supermicro's MB is not certified hardware, but
she just indicates hardware problem.

Tsuyoshi.
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Re: [CentOS] New kernel causes hardware error?

[Peter Kjellstrom]

On Tuesday 22 June 2010, Eric Deis wrote:
> I have recently upgraded to 2.6.18-194.3.1.el5 and within several days
> the machine crashed with the following error (repeating in mcelog):

I'm guessing the old kernel just didn't notice.

The below MCEs indicate bad hardware. Since the DIMMs are a lot easier to 
debug I'd suggest you start there (but it could be the systemboard too). Try 
running with half you DIMMs then the other half.

/Peter

> MCE 0
> HARDWARE ERROR. This is *NOT* a software problem!
> Please contact your hardware vendor
> CPU 2 BANK 8 MISC 41
...


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Re: [CentOS] New kernel causes hardware error?

[John R Pierce]

On 06/22/10 12:21 AM, Peter Kjellstrom wrote:
> On Tuesday 22 June 2010, Eric Deis wrote:
>
>> I have recently upgraded to 2.6.18-194.3.1.el5 and within several days
>> the machine crashed with the following error (repeating in mcelog):
>>  
> I'm guessing the old kernel just didn't notice.
>
> The below MCEs indicate bad hardware. Since the DIMMs are a lot easier to
> debug I'd suggest you start there (but it could be the systemboard too). Try
> running with half you DIMMs then the other half.
>

and on nehalem (xeon 5500, 5600), the memory controller is in the CPUs, 
so they are suspect too.

first, however, i'd see if there's a BIOS flash upgrade for the 
mainboard.  these sometimes have microcode fixes for various specific 
Intel CPUs, and also may have updated memory timing parameters.


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Re: [CentOS] New kernel causes hardware error?

[Peter Kjellstrom]

On Tuesday 22 June 2010, John R Pierce wrote:
> On 06/22/10 12:21 AM, Peter Kjellstrom wrote:
> > On Tuesday 22 June 2010, Eric Deis wrote:
> >> I have recently upgraded to 2.6.18-194.3.1.el5 and within several days
> >> the machine crashed with the following error (repeating in mcelog):
> >
> > I'm guessing the old kernel just didn't notice.
> >
> > The below MCEs indicate bad hardware. Since the DIMMs are a lot easier to
> > debug I'd suggest you start there (but it could be the systemboard too).
> > Try running with half you DIMMs then the other half.
>
> and on nehalem (xeon 5500, 5600), the memory controller is in the CPUs,
> so they are suspect too.

In theory, yes. But while we've replaced many DIMMS and some system boards I 
don't think we've replaced a single (nehalem type) CPU (this observed during 
~1 CPU-months).

/Peter


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Re: [CentOS] Increasing NFS Performance

[lhecking]

Tim Nelson writes:
> Greetings all-
> 
> I have a CentOS 5 (Final) system that is serving up content to several other
> hosts via NFS. The amount of data transferred is rather small as most of the
> files are under 100kb and each export has maybe 100 files that are accessed
> regularly. I'm finding that as I add more hosts accessing the NFS server, the
> performance seems to be getting poorer. There are obvious delays when doing
> simple 'ls' on an NFS mounted directory.
 
 So, this is CentOS 5.0 or 5.1. You should upgrade to at least CentOS 5.2. The
 5.2 kernel fixes serious performance problems with NFS.

 I think this is the related kernel changelog. Our docs show that we had
 machines running 5.1 with kernel 2.6.18-53.1.21.el5.bz32 to work around
 the problem.

* Tue Feb 05 2008 Don Zickus  [2.6.18-78.el5]
...
- [nfs] reduce number of wire RPC ops, increase perf (Peter Staubach ) [32]



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Re: [CentOS] MiscFixed fonts in CentOS 5.5

[John Doe]

From: Niki Kovacs 
> The MiscFixed fonts don't seem to be available in 
> GNOME Terminal anymore.

I can find misc-fixed in gnome terminal and xfontsel...
I have these packages...

bitmap-fonts-0.3-5.1.1
bitstream-vera-fonts-1.10-7
chkfontpath-1.10.1-1.1
dejavu-lgc-fonts-2.10-1
fontconfig-2.4.1-7.el5
fontconfig-devel-2.4.1-7.el5
ghostscript-fonts-5.50-13.1.1
libXfont-1.2.2-1.0.3.el5_1
libXfontcache-1.0.2-3.1
liberation-fonts-1.0-1.el5
libfontenc-1.0.2-2.2.el5
urw-fonts-2.3-6.1.1
xorg-x11-font-utils-7.1-2
xorg-x11-fonts-100dpi-7.1-2.1.el5
xorg-x11-fonts-75dpi-7.1-2.1.el5
xorg-x11-fonts-ISO8859-1-100dpi-7.1-2.1.el5
xorg-x11-fonts-ISO8859-1-75dpi-7.1-2.1.el5
xorg-x11-fonts-Type1-7.1-2.1.el5
xorg-x11-fonts-base-7.1-2.1.el5
xorg-x11-fonts-misc-7.1-2.1.el5
xorg-x11-fonts-truetype-7.1-2.1.el5

JD


  
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Re: [CentOS] blog tool use the LDAP auth

[Mathieu Baudier]

> Wordpress should:
>
> http://wordpress.org/extend/plugins/simple-ldap-login/

I have already tested this Wordpress plugin a few months ago (on
CentOS 5.4 x86_64 with EPEL's Wordpress).
I needed to fiddle a bit with the UI, but quickly got an LDAP
integration working.

As whether it is 100% secure, I would not guarantee it (I did the
above on a test environment), because the plugin did not look very
mature.
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Re: [CentOS] the Postfix packages are way too old

[Kai Schaetzl]

Florin Andrei wrote on Mon, 21 Jun 2010 12:42:46 -0700:

> No, that's fine, really. I was just pointing out that, for some 
> Internet-facing systems, this policy may be inadequate, due to the 
> fast-changing nature of the Internet.

I disagree. The included Postfix works just fine. You have a very specific 
need that 99.??? % of the users don't have. This doesn't rectify such a 
major version jump. You can always install a newer version that has the 
features you need by yourself - as you did.
Thanks for the link to the thread, though, interesting read.

Kai

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Re: [CentOS] Increasing NFS Performance

[Karanbir Singh]

On 22/06/2010 09:52, lheck...@users.sourceforge.net wrote:
>  So, this is CentOS 5.0 or 5.1. You should upgrade to at least CentOS 5.2. The
>  5.2 kernel fixes serious performance problems with NFS.

I agree, getting to the latest distro packages is a good idea. There
were some nfs issues in < 5.2 and then again for a short while during
the span of 5.4 there were issues. Mostly fixed afaik in 5.5 tree's.[1]

- KB

[1]: dont have the numbers on hand, but it shouldnt be too hard to just
install the latest kernels and do some tests.
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Re: [CentOS] the Postfix packages are way too old

[Karanbir Singh]

On 22/06/2010 11:31, Kai Schaetzl wrote:
> Florin Andrei wrote on Mon, 21 Jun 2010 12:42:46 -0700:
> 
>> No, that's fine, really. I was just pointing out that, for some 
>> Internet-facing systems, this policy may be inadequate, due to the 
>> fast-changing nature of the Internet.
> 
> I disagree. The included Postfix works just fine. You have a very specific 
> need that 99.??? % of the users don't have. This doesn't rectify such a 
> major version jump. You can always install a newer version that has the 
> features you need by yourself - as you did.

We have a mechanism in CentOS that allows for such functionality. Which
is : leave the distro packages as is, and use the Plus repo for added of
changed functionality that only a smaller percentage of the people might
need. And I am offering to help someone work through the process of
getting this package into the Plus repo.

Now the task of someone stepping up and taking on the responsibility is
open.

- KB
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Re: [CentOS] Migrating away from Nagios

[Karanbir Singh]

On 22/06/2010 00:52, Phil Manuel wrote:
> Has anyone looked at using icinga ? I know it replaces the front end of 
> nagios, and uses the same (slightly modified ?) backend, using the same 
> plugins.
> 

Icinga is an interesting project, and there is work going on under the
hood to make it a more flexible and more usable nagios variant. However,
they haven't actually released anything significant as yet. What you get
out of the box from Icinga is pretty much nagios at the moment.

- KB
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Re: [CentOS] Migrating away from Nagios

[Karanbir Singh]

On 21/06/2010 18:05, Les Mikesell wrote:
> I didn't know about that, but the first googled hit says you are 
> supposed to be able to write reusable tests in a human-readable language 
> which sounds way too unrealistic to ever work.  And I want a tool that 
> understands network equipment natively, not just it's own clients on 
> only the hardware/OS's where you are able to run them.
> 

I dont think its a one or the other situation. Flapjack + cucumber is
more oriented towards app developers being able to also contribute to
the monitoring and state management policies. And for that I've seen it
work well, but not used it myself.

We have a hom ebrew setup in place right now for the app and services
monitoring, that I am quite keen to replace as time permits.

- KB
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[CentOS] OT: Recommendation for a good Internationalized terminal software

[Digimer]

Hi all,

   We've got server-based application that runs on CentOS. Until now, 
most of our customer's end-users have accessed the application using 
either PuTTY or Teraterm. I was asked yesterday to try and find 
internationalized add ons or alternatives for our new Asian customers 
(Japan, Korea and China atm).

   I figured if anyone would be able to recommend terminal emulation 
programs, it'd be you guys. So, would anyone be able to recommend any 
windows-based, Asian character set telnet/ssh terminal apps?

   Thanks! Sorry for being a bit off topic, too. :)

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Re: [CentOS] [DRBD-user] Kernel independent DRBD packages for RHEL, CentOS and Scientific Linux

[JohnS]

On Mon, 2010-06-21 at 17:11 +0200, Ralph Angenendt wrote:
> On Mon, Jun 21, 2010 at 12:54 PM, Joseph L. Casale
>  wrote:
> >>This seems like duplication of effort with the CentOS people, since they
> >>already package DRBD for CentOS 5.x (and it works very well).
> >
> > No its not, the CentOS packages are no longer maintained...
> 
> http://dev.centos.org/testing/ tells me something else (and yes, this
> time they will go into extras).
> 
> Ralph
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The requested URL /testing/ was not found on this server.  I give up...

John

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Re: [CentOS] OT: Recommendation for a good Internationalized terminal software

[JohnS]

On Tue, 2010-06-22 at 07:23 -0400, Digimer wrote:
> Hi all,
> 
>We've got server-based application that runs on CentOS. Until now, 
> most of our customer's end-users have accessed the application using 
> either PuTTY or Teraterm. I was asked yesterday to try and find 
> internationalized add ons or alternatives for our new Asian customers 
> (Japan, Korea and China atm).
> 
>I figured if anyone would be able to recommend terminal emulation 
> programs, it'd be you guys. So, would anyone be able to recommend any 
> windows-based, Asian character set telnet/ssh terminal apps?
> 
>Thanks! Sorry for being a bit off topic, too. :)
---
Teraterm does not support Intl?

John

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Re: [CentOS] [DRBD-user] Kernel independent DRBD packages for RHEL, CentOS and Scientific Linux

[Bob Beers]

On Tue, Jun 22, 2010 at 9:03 AM, JohnS  wrote:
>
> On Mon, 2010-06-21 at 17:11 +0200, Ralph Angenendt wrote:
>> On Mon, Jun 21, 2010 at 12:54 PM, Joseph L. Casale
>>  wrote:
>> >>This seems like duplication of effort with the CentOS people, since they
>> >>already package DRBD for CentOS 5.x (and it works very well).
>> >
>> > No its not, the CentOS packages are no longer maintained...
>>
>> http://dev.centos.org/testing/ tells me something else (and yes, this
>> time they will go into extras).
>>
>> Ralph
> ---
> The requested URL /testing/ was not found on this server.  I give up...

a few clicks around and I found this:



Is that the place?

HTH,
-Bob
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Re: [CentOS] OT: Recommendation for a good Internationalized terminal software

[Digimer]

On 10-06-22 09:19 AM, JohnS wrote:
>
> On Tue, 2010-06-22 at 07:23 -0400, Digimer wrote:
>> Hi all,
>>
>> We've got server-based application that runs on CentOS. Until now,
>> most of our customer's end-users have accessed the application using
>> either PuTTY or Teraterm. I was asked yesterday to try and find
>> internationalized add ons or alternatives for our new Asian customers
>> (Japan, Korea and China atm).
>>
>> I figured if anyone would be able to recommend terminal emulation
>> programs, it'd be you guys. So, would anyone be able to recommend any
>> windows-based, Asian character set telnet/ssh terminal apps?
>>
>> Thanks! Sorry for being a bit off topic, too. :)
> ---
> Teraterm does not support Intl?
>
> John

Unless I am missing something, it seems to support German and Japanese 
only. I also need Korean and Chinese. :) I'd guess it'd show the info in 
the terminal itself in UTF8, but the menu would be nice to have in the 
user's first language, too.

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Re: [CentOS] Kernel independent OCFS2 packages for RHEL, Scientific Linux and CentOS

[Ross Walker]

On Jun 21, 2010, at 9:00 AM, Les Mikesell  wrote:

> Karanbir Singh wrote:
>> On 06/19/2010 08:58 AM, Farkas Levente wrote:
>>> agree. Karanbir, you used to say that community is about those people
>>> who help the community and not about those who use the community. ihmo
>>> Dag is one of those the made most for this community.
>> 
>> I don't see how any of that is even remotely relevant here. And of all 
>> the people, Dag is one person I know will understand that. Furthermore, 
>> I have much regard and respect for all the work that Dag does. But that 
>> has no relevance to the issue here.
>> 
>> Not expecting this list to be turned into a mass announcement list isnt 
>> a bad target imho. Besides, I would say the same thing irrespective of 
>> who it was.
> 
> Ummm, shouldn't the fact that this work replaces/supercedes stuff that the 
> centos project started and abandoned have some bearing here?  That is, there 
> are 
> very good reasons for it to be relevant to this audience regardless of the 
> personalities involved.

I think all parties have a valid point.

One, the list can't let every repo out there post an announcement about the 
availability of every package out there as the list will turn into an 
announcements list which is not what it is intended for.

Two, these are valuable announcements that the EL community should be able to 
see as it directly affects their environments.

What I propose is to have repos batch their announcements into a change log of 
packages updated since the last announcement (including pointers to the repo 
where detailed info can be found) and post no more then once a month or so.

Something along those lines would be acceptable and once agreed upon it should 
be added to the list's acceptable use guidelines.

-Ross

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Re: [CentOS] NFS performance - default rsize

[Alex Still]

[..]

>> /proc/mounts shows rsize has been negotiated to 1mB
>
> Have you tested the same thing with a Linux NFS server?
>
> The CentOS 5.x kernel has a maximum server [rw]size of 32Kb, so you
> would need to use something with a more recent kernel to get [rw]sizes
> to be 1Mb.
>

Haven't tried with a linux server, will do.
One thing tho, we are still mostly running old Fedora Core 6 installs
(migrating to CentOS), which also negotiated rsize to 1mB with the
same NFS server, and they don't have the problem :

$ dd if=toto of=/dev/null bs=1024k
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.44039 seconds, 72.8 MB/s

$ cat /etc/redhat-release
Fedora Core release 6 (Zod)

tail -1 /proc/mounts
nfs1:/local/users /users nfs
rw,vers=3,rsize=1048576,wsize=1048576,hard,intr,proto=tcp,timeo=600,retrans=2,sec=sys,addr=nfs1
0 0

The setup and hardware is strictly identical to the CentOS
environment. (we've installed both distros on the same servers, just
to be sure).

Network traces don't show anything special, no fragmentation or
delays. The only odd thing as I mentionned is that it's the client
which is waiting a long time between requests. Wonder what's happening
there.
Well I'll try with a linux NFS server see if it changes something,
will post here if we figure it out

Regards,

Alex
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Re: [CentOS] NFS performance - default rsize

[Ross Walker]

On Jun 21, 2010, at 12:26 PM, Alex Still  wrote:

> On Mon, Jun 21, 2010 at 4:38 PM, Nataraj  wrote:
> 
> [...]
> 
>> Well, it's been a long time since I've done troubleshooting on large NFS
>> networks, but here's an idea...
>> 
>> Are you seeing any kind of packet loss/retransmissions?  Take a look at
>> netstat  -s.  When I last did this work it was with NFS over udp, but I
>> think retransmitted packets will cause more performance loss with large
>> packet sizes.  I used to find machines with broken ethernet interfaces
>> that would cause these kinds of problems.
>> 
>> Nataraj
> 
> 
> Thanks guys for the feedback.
> I've done more tests : There are very very few retransmits (less than
> 0,01%) so I don't think that's what happening.
> The client still seems to be "waiting" for something between requests,
> very strange.
> 
> On some servers this behavior returned despite rsize being set to 32k,
> I had to set it to 8k to get reasonnable throughput. So there's
> definitly something fishy going on. This has been reported on over 20
> machines, so I don't think it's faulty hardware we're seeing.
> 
> Any thoughts, ideas on how to debug this ?

Can you explain the network environment and the connectivity between the client 
and server some more.

-Ross


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Re: [CentOS] How to specify the default route?

[Enrique Verdes]

El lun, 21-06-2010 a las 19:57 -0400, Rick Thomas escribió:
> I have a machine with two net interfaces.
> 
> it seems to always pick the wrong one (eth1) as the default route.
> 
> I can change it with
> 
>   route del default
>   route add default eth0
> 
> after it's up (or in rc.local, of course), but I'd like to figure out  
> what I need to do this "the CentOS way" (e.g. edit some configuration  
> file? Run some config utility, what?) once and for all.
> 
> Can somebody point me to the canonical documentation on the subject?   
> I've searched /usr/share/doc and the man pages, but I can't find  
> anything useful.
> 
> Googling for "default route centos" gives some interesting stuff, but  
> nothing definitive.

Maybe I'm missing something, but why you specify an interface and not an
IP address as default gateway?

You can specify the gateway in the /etc/sysconfig/networking file or in
the /etc/sysconfig/network-scripts/ifcfg-ethX, where X is the number of
the eth interface. The variable GATEWAY is used.

This files are read by /etc/init.d/network script, but probably this
script expect an IP address, should check the script to verify this.

It will be usefull if you send the output of the route -n command, and
the content of /etc/sysconfig/network-scripts/ifcfg-eth{0,1} so we can
help you better.

Enrique.


> 
> Thanks!
> 
> Rick
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Re: [CentOS] Samba3x daily logged errors with Win7 clients

[Steve Snyder]

On 05/25/2010 08:08 AM, Steve Snyder wrote:
> In the course of upgrading from CentOS 5.4 to CentOS 5.5 I changed from
> using the samba (v3.0.x) packages to the samba3x (v3.3.8) packages,
> mostly because the newer version was said to better support Win7.  The
> Samba server services Linux, WinXP, and Win7 clients.
>
> Now I get many, many errors logged to the Samba logs shortly after 3:00
> AM, but only from the Win7 clients.  I get roughly 430 sets of these
> messages in a twenty-second (!) period:
>
> [2010/05/25 03:17:36,  1] smbd/service.c:make_connection_snum(748)
> create_connection_server_info failed: NT_STATUS_ACCESS_DENIED
>
> These errors are never seen in the Samba logs that track the Linux and
> WinXP clients, only the Win7 clients.  I don't run virus scans or
> anything else (that I know of) on the Win7 machines in the middle of the
> night, but I do have the usual cron jobs running on the CentOS server
> around that time.  Could be related to log rotation or something like that?
>
> I haven't seen a loss of connectivity, but then I don't use the client
> machines at 3:15AM.  If there is a brief connection failure I wouldn't
> know it.
>
> I used my old (Samba 3.0.x) config file, user definitions and password
> database when I made the switch to the new (Samba 3.3.8) server and the
> newer code didn't seem to have any complaints with them.  The client
> shares seem to work without any problems.
>
> Any thoughts on what could be generating all these errors?
>
> Thanks.

Sorry for replying to my own post, but I want to report the resolution 
for those who will experience the same problem.

My Win7 clients each have several connected network drives, shares 
exported by Samba.  Of these all have Samba "guest ok" configurations 
except one, the user's home directory.  This is the source of the problem.

On Win7 "Windows Defender" by default runs a daily scan for viruses, 
etc.  It runs this scheduled task as user SYSTEM.  All is well with 
SYSTEM accessing the "guest ok" shares, but  roughly 430 errors are 
generated when attempting to scan the user's home share.

With Samba logging cranked up to level 2 the full errors look like this:

[2010/06/22 09:00:25,  2] lib/access.c:check_access(406)
   Allowed connection from 192.168.0.6 (192.168.0.6)
[2010/06/22 09:00:25,  2] smbd/service.c:create_connection_server_info(656)
   guest user (from session setup) not permitted to access this share 
(nancy)
[2010/06/22 09:00:25,  1] smbd/service.c:make_connection_snum(748)
   create_connection_server_info failed: NT_STATUS_ACCESS_DENIED

That "nancy" is the name of the user's home directory.  No other shares 
generate Samba errors, though all are scanned by Windows Defender.

Win7 runs this daily task as SYSTEM so that it may run regardless of 
which (or any) user is logged in.  I'm fine with just disabling the 
scheduled scan, but others may want to try playing with the user account 
used to run the scan.

FYI.
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Re: [CentOS] OT: Recommendation for a good Internationalized terminal software

[JohnS]

On Tue, 2010-06-22 at 09:24 -0400, Digimer wrote:
> On 10-06-22 09:19 AM, JohnS wrote:
> >
> > On Tue, 2010-06-22 at 07:23 -0400, Digimer wrote:
> >> Hi all,
> >>
> >> We've got server-based application that runs on CentOS. Until now,
> >> most of our customer's end-users have accessed the application using
> >> either PuTTY or Teraterm. I was asked yesterday to try and find
> >> internationalized add ons or alternatives for our new Asian customers
> >> (Japan, Korea and China atm).
> >>
> >> I figured if anyone would be able to recommend terminal emulation
> >> programs, it'd be you guys. So, would anyone be able to recommend any
> >> windows-based, Asian character set telnet/ssh terminal apps?
> >>
> >> Thanks! Sorry for being a bit off topic, too. :)
> > ---
> > Teraterm does not support Intl?
> >
> > John
> 
> Unless I am missing something, it seems to support German and Japanese 
> only. I also need Korean and Chinese. :) I'd guess it'd show the info in 
> the terminal itself in UTF8, but the menu would be nice to have in the 
> user's first language, too.
--
Well that is correct. Heres Simp Chinese.  Send me a valid email and I
will give you the details 

[泰拉期限]
DLG_SYSTEM_FONT =系统，14,0
DLG_TAHOMA_FONT =宋体，8,0

MENU_FILE =＆文件
MENU_FILE_NEW =＆新的连接... \ tAlt + N的

John

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[CentOS] problem rebuilding kvm package on centos 5.5

[David Mansfield]

Hi All:

I'm trying to rebuild the kvm SRPM (kvm-83-164.el5_5.9.src.rpm)
on a centos 5.5 x86_64 and it's failing with the message:

error: Failed build dependencies:
kernel-devel-x86_64 = 2.6.18-194.el5 is needed by kvm-83-164.9.x86_64

I have already run "yum-builddep " and here is the output
(indicates nothing missing)

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * addons: mirror.highspeedweb.net
 * base: mirror.cogentco.com
 * epel: mirror.seas.harvard.edu
 * extras: mirror.skiplink.com
 * rpmforge: fr2.rpmfind.net
 * updates: mirrors.adams.net
Excluding Packages from Extra Packages for Enterprise Linux 5 - x86_64
Finished
Checking for new repos for mirrors
SDL-devel-1.2.10-8.el5.x86_64
dev86-0.16.17-2.2.x86_64
iasl-20090123-1.el5.x86_64
zlib-devel-1.2.3-3.x86_64
gnutls-devel-1.4.1-3.el5_4.8.x86_64
texi2html-1.76-4.fc6.noarch
rsync-3.0.7-1.el5.rf.x86_64
1:pkgconfig-0.21-2.el5.x86_64
pciutils-devel-2.2.3-8.el5_4.x86_64
qspice-libs-devel-0.3.0-54.el5.x86_64
kernel-devel-2.6.18-194.3.1.el5.x86_64
kernel-devel-2.6.18-194.el5.x86_64
No uninstalled build requires

I can't figure how this missing dependency would be resolved?

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[CentOS] NFS exports network mask

[Carlos S]

Hi,

I need to export NFS shares to all clients in a subnetwork, except
that one client will have different NFS options. I am not sure how to
write subnest mask for this in exports file. For all clients it was
easy as all I had to do was 10.0.0.0/16 or 10.0.0.0/255.255.0.0.  How
do I modify exports file to have special rule/entry for this
particular IP? Any pointers on how to do this?

--
Thanks,
CS
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Re: [CentOS] Migrating away from Nagios

[Les Mikesell]

On 6/22/2010 6:06 AM, Karanbir Singh wrote:
> On 21/06/2010 18:05, Les Mikesell wrote:
>> I didn't know about that, but the first googled hit says you are
>> supposed to be able to write reusable tests in a human-readable language
>> which sounds way too unrealistic to ever work.  And I want a tool that
>> understands network equipment natively, not just it's own clients on
>> only the hardware/OS's where you are able to run them.
>>
>
> I dont think its a one or the other situation. Flapjack + cucumber is
> more oriented towards app developers being able to also contribute to
> the monitoring and state management policies. And for that I've seen it
> work well, but not used it myself.

Can't the app developer side either expose some status values via xml 
over http or add an extension for net-snmp?  It seems to me that if you 
have to design a new framework you've already missed the point.

-- 
   Les Mikesell
lesmikes...@gmail.com
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Re: [CentOS] NFS performance - default rsize

[Alex Still]

[...]

>> On some servers this behavior returned despite rsize being set to 32k,
>> I had to set it to 8k to get reasonnable throughput. So there's
>> definitly something fishy going on. This has been reported on over 20
>> machines, so I don't think it's faulty hardware we're seeing.
>>
>> Any thoughts, ideas on how to debug this ?
>
> Can you explain the network environment and the connectivity between the 
> client and server some more.

Clients are blade servers. The blade chassis have integrated cisco
switches, which are plugged to a cisco 6509. The NFS server is on
another site 40km away, directly connected to another 6509.  These
datacenters are linked via DWDM.
Latency between a client and the NFS server is about half a
millisecond. Jumbo frames are enabled.

Blades have 1 Gb link
The NFS server has multiple 1Gb links, used for different shares
Neither are close to full utilization, maybe 100Mb/s of traffic and 20
000 paquets/s at the server end


Alex
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Re: [CentOS] Migrating away from Nagios

[Les Mikesell]

On 6/21/2010 11:27 PM, Joseph L. Casale wrote:
>> Has anyone looked at using icinga ?
>
> The forums are nearly dead, doesn't look like much of the Nagios
> folk jumped ship yet. Archives show next to no activity.
>
> Frankly, if I am migrating away from Nagios, I would likely be compelled
> to put any effort into a significant improvement like Zenoss or OpenNMS
> rather than trade apples for apples...

If you'd like to listen to an audio session with the project leads, both 
Zenoss and OpenNMS have been featured on the FLOSS Weekly podcast 
(http://twit.tv/floss).  Zenoss is session 124 (very recent) and OpenNMS 
was session 15 which is a bit dated but these discussions aren't 
particularly technical - but they give you a feeling for the philosophy 
of the projects, where they are headed, who uses them, and how they mesh 
their commercial and opensource aspects.

I happen to have a long commute and play stuff like this on the way...

-- 
   Les Mikesell
 lesmikes...@gmail.com
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Re: [CentOS] NFS performance - default rsize

[JohnS]

On Tue, 2010-06-22 at 17:44 +0200, Alex Still wrote:

> 
> Clients are blade servers. The blade chassis have integrated cisco
> switches, which are plugged to a cisco 6509. The NFS server is on
> another site 40km away, directly connected to another 6509.  These
> datacenters are linked via DWDM.
> Latency between a client and the NFS server is about half a
> millisecond. Jumbo frames are enabled.
> 
> Blades have 1 Gb link
> The NFS server has multiple 1Gb links, used for different shares
> Neither are close to full utilization, maybe 100Mb/s of traffic and 20
> 000 paquets/s at the server end
---
http://www.google.com/search?hl=en&client=firefox-a&hs=qKR&rls=org.mozilla%3Aen-US%3Aofficial&q=cisco+6509+nfs+problems&aq=f&aqi=&aql=&oq=&gs_rfai=

Your not the only one with the prob..

John

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Re: [CentOS] NFS exports network mask

[James Pearson]

Carlos S wrote:
> Hi,
> 
> I need to export NFS shares to all clients in a subnetwork, except
> that one client will have different NFS options. I am not sure how to
> write subnest mask for this in exports file. For all clients it was
> easy as all I had to do was 10.0.0.0/16 or 10.0.0.0/255.255.0.0.  How
> do I modify exports file to have special rule/entry for this
> particular IP? Any pointers on how to do this?

Something like:

/some/disk  10.0.0.0/16(ro) 10.0.0.2(rw)

This will export /some/disk read-write to 10.0.0.2 and read-only to the 
rest of the hosts on the 10.0.0.0/16 network

James Pearson
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[CentOS] XFS on CentOS

[Boris Epstein]

Hi all,

Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
OpenSUSE) CentOS does not come with XFS support by default but rather
requires custom modifications after the install in order for you to be
able to support XFS on your CentOS machine? Just seems a little odd
given how much CentOS is oriented to be used as a server OS.

Thanks.

Boris.
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Re: [CentOS] XFS on CentOS

[aurfalien]

On 06/22/2010 08:57 AM, Boris Epstein wrote:
> Hi all,
>
> Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
> OpenSUSE) CentOS does not come with XFS support by default but rather
> requires custom modifications after the install in order for you to be
> able to support XFS on your CentOS machine? Just seems a little odd
> given how much CentOS is oriented to be used as a server OS.
>
> Thanks.
>
> Boris.
> ___
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> http://lists.centos.org/mailman/listinfo/centos
>
I've always thought that Centos follows RHEL exactly, cuz it is made 
from there source.

I think this is better asked of RHEL.

If Centos were to deviate from the RHEL dev path, then ity may no longer 
be Centos.

Am I wrong?
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Re: [CentOS] XFS on CentOS

[Athmane Madjoudj]

On 06/22/2010 04:57 PM, Boris Epstein wrote:
> Hi all,
>
> Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
> OpenSUSE) CentOS does not come with XFS support by default but rather
> requires custom modifications after the install in order for you to be
> able to support XFS on your CentOS machine? Just seems a little odd
> given how much CentOS is oriented to be used as a server OS.
>
> Thanks.
>

AFAIK, XFS kernel, modules and utils are available in CentOSPlus[1] repo

[1] http://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus


-- 
Athmane Madjoudj
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Re: [CentOS] problem rebuilding kvm package on centos 5.5

[Akemi Yagi]

On Tue, Jun 22, 2010 at 8:02 AM, David Mansfield  wrote:
> Hi All:
>
> I'm trying to rebuild the kvm SRPM (kvm-83-164.el5_5.9.src.rpm)
> on a centos 5.5 x86_64 and it's failing with the message:
>
> error: Failed build dependencies:
>        kernel-devel-x86_64 = 2.6.18-194.el5 is needed by kvm-83-164.9.x86_64
>
> I have already run "yum-builddep " and here is the output
> (indicates nothing missing)

> kernel-devel-2.6.18-194.3.1.el5.x86_64
> kernel-devel-2.6.18-194.el5.x86_64
> No uninstalled build requires
>
> I can't figure how this missing dependency would be resolved?

It looks as if you have all required packages. Can you confirm that
kernel-devel is indeed there?  What is the output from:

rpm -qa kernel\* | sort

Akemi
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Re: [CentOS] NFS exports network mask

[Carlos S]

Thanks James.

So does exports list has any priority for loading config. e.g. I have
general rule as 10.0.0.0/16 for read-only and then 10.0.0.20 as
read-write. Then 10.0.0.20 overrides (default) 10.0.0.0/16 options?

--
CS.

On Tue, Jun 22, 2010 at 11:29 AM, James Pearson
 wrote:
> Carlos S wrote:
>> Hi,
>>
>> I need to export NFS shares to all clients in a subnetwork, except
>> that one client will have different NFS options. I am not sure how to
>> write subnest mask for this in exports file. For all clients it was
>> easy as all I had to do was 10.0.0.0/16 or 10.0.0.0/255.255.0.0.  How
>> do I modify exports file to have special rule/entry for this
>> particular IP? Any pointers on how to do this?
>
> Something like:
>
> /some/disk  10.0.0.0/16(ro) 10.0.0.2(rw)
>
> This will export /some/disk read-write to 10.0.0.2 and read-only to the
> rest of the hosts on the 10.0.0.0/16 network
>
> James Pearson
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Re: [CentOS] XFS on CentOS

[Miguel Medalha]

> Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
> OpenSUSE) CentOS does not come with XFS support by default but rather
> requires custom modifications after the install in order for you to be
> able to support XFS on your CentOS machine? Just seems a little odd
> given how much CentOS is oriented to be used as a server OS

The 64 bit version of CentOS does support XFS.

The reason why it is only supported by the 64bit version has recently 
been discussed on this list. Please search the list's archives.

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Re: [CentOS] XFS on CentOS

[Boris Epstein]

On Tue, Jun 22, 2010 at 12:35 PM, aurfalien  wrote:
> On 06/22/2010 08:57 AM, Boris Epstein wrote:
>> Hi all,
>>
>> Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
>> OpenSUSE) CentOS does not come with XFS support by default but rather
>> requires custom modifications after the install in order for you to be
>> able to support XFS on your CentOS machine? Just seems a little odd
>> given how much CentOS is oriented to be used as a server OS.
>>
>> Thanks.
>>
>> Boris.
>> ___
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>> http://lists.centos.org/mailman/listinfo/centos
>>
> I've always thought that Centos follows RHEL exactly, cuz it is made
> from there source.
>
> I think this is better asked of RHEL.
>
> If Centos were to deviate from the RHEL dev path, then ity may no longer
> be Centos.
>
> Am I wrong?
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>

Good points. OK, then: why does RHEL not support XFS straight out of the box? :)

Boris.
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Re: [CentOS] OT: Recommendation for a good Internationalized terminal software

[Simon Billis]

Digimer sent a missive on 2010-06-22:

> Hi all,
> 
>We've got server-based application that runs on CentOS. Until now,
> most of our customer's end-users have accessed the application using
> either PuTTY or Teraterm. I was asked yesterday to try and find
> internationalized add ons or alternatives for our new Asian customers
> (Japan, Korea and China atm).
> 
>I figured if anyone would be able to recommend terminal emulation
> programs, it'd be you guys. So, would anyone be able to recommend any
> windows-based, Asian character set telnet/ssh terminal apps?
> 
>Thanks! Sorry for being a bit off topic, too. :)
Hi,

Check out
http://www.celestialsoftware.net/terminal-features/international-terminal-fe
atures.html I use absolute telnet and I love it. It does everything that I
need and more. I've not used the international features, but I think that it
may work for you.

Rgds
Simon.




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Re: [CentOS] XFS on CentOS

[Steve Huff]

On Jun 22, 2010, at 12:41 PM, Boris Epstein wrote:

> why does RHEL not support XFS straight out of the box?


i suspect you would be more likely to receive a meaningful answer from one of 
these sources:

https://listman.redhat.com/mailman/listinfo/rhelv5-list
https://listman.redhat.com/mailman/listinfo/rhelv6-beta-list

in addition, this bugzilla entry 
(https://bugzilla.redhat.com/show_bug.cgi?id=213744#c10) suggests that you can 
contact Eric Sandeen at RH for further information about XFS in RHEL.

-shuff

--
If this were played upon a stage now, I could condemn it as an improbable 
fiction. - Fabian, Twelfth Night, III,v
http://five.sentenc.es



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Re: [CentOS] XFS on CentOS

[Ray Van Dolson]

On Tue, Jun 22, 2010 at 01:48:42PM -0400, Steve Huff wrote:
> 
> On Jun 22, 2010, at 12:41 PM, Boris Epstein wrote:
> 
> > why does RHEL not support XFS straight out of the box?
> 
> i suspect you would be more likely to receive a meaningful answer
> from one of these sources:
> 
> https://listman.redhat.com/mailman/listinfo/rhelv5-list
> https://listman.redhat.com/mailman/listinfo/rhelv6-beta-list
> 
> in addition, this bugzilla entry
> (https://bugzilla.redhat.com/show_bug.cgi?id=213744#c10) suggests
> that you can contact Eric Sandeen at RH for further information about
> XFS in RHEL.

FYI, XFS should be fully supported in RHEL6 and at some point in RHEL5
(I believe it's "layered" right now).  The kernel supports it, but the
userspace tools must be retrieved separately from a special channel or
through support.

Red Hat had to hire an XFS engineer so they could properly support it.

Ray
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Re: [CentOS] Migrating away from Nagios

[Andres Lucena]

On Tue, Jun 22, 2010 at 6:53 AM, Rajagopal Swaminathan
 wrote:
> Greetings,
>
>
> On 6/21/10, Jane Curry  wrote:
>>
>> If you want further help, please ask!
>>
>
>
> Havwe you tried Zabbix, the NextGen NMS?
>

+1 to Zabbix

LAMP software, agent for all plataforms, script friendly, SNMP, IPMI,
all the letters you'll need. And maps; oh and I forgot a little
detail... Do you like graphs?? Well, out of the box, working beautiful
graphs, and everything is configured through the Web-GUI. Also you can
do export/import (XML format) and lots of magic, even in the new
version there is an API.

So, I would use Zabbix, it replaced both Nagios+Munin+MRTG in the work
where I am right now. I LOVE GRAPHS!; and also if you want, you can
have Enterprise support.


Regards,
Andres
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Re: [CentOS] How to specify the default route?

[Rick Thomas]

Thanks! to all who replied.

I solved it by putting identical "GATEWAY=" clauses in each of

/etc/sysconfig/networking/devices/ifcfg-eth0
/etc/sysconfig/networking/devices/ifcfg-eth1

This works without error, even though the gateway IP address in  
question is not accessible from eth1.

I haven't tried taking the GATEWAY clause(s) out of the ifcfg files  
and moving it to the /etc/sysconfig/network file alone.  Does anybody  
know if that's the preferred configuration option?

Thanks!

Rick

> El lun, 21-06-2010 a las 19:57 -0400, Rick Thomas escribió:
>> I have a machine with two net interfaces.
>>
>> it seems to always pick the wrong one (eth1) as the default route.
>>
>> I can change it with
>>
>>  route del default
>>  route add default eth0
>>
>> after it's up (or in rc.local, of course), but I'd like to figure out
>> what I need to do this "the CentOS way" (e.g. edit some configuration
>> file? Run some config utility, what?) once and for all.
>>
>> Can somebody point me to the canonical documentation on the subject?
>> I've searched /usr/share/doc and the man pages, but I can't find
>> anything useful.
>>
>> Googling for "default route centos" gives some interesting stuff, but
>> nothing definitive.

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Re: [CentOS] NFS performance - default rsize

[Ross Walker]

On Jun 22, 2010, at 11:44 AM, Alex Still  wrote:

> [...]
> 
>>> On some servers this behavior returned despite rsize being set to 32k,
>>> I had to set it to 8k to get reasonnable throughput. So there's
>>> definitly something fishy going on. This has been reported on over 20
>>> machines, so I don't think it's faulty hardware we're seeing.
>>> 
>>> Any thoughts, ideas on how to debug this ?
>> 
>> Can you explain the network environment and the connectivity between the 
>> client and server some more.
> 
> Clients are blade servers. The blade chassis have integrated cisco
> switches, which are plugged to a cisco 6509. The NFS server is on
> another site 40km away, directly connected to another 6509.  These
> datacenters are linked via DWDM.
> Latency between a client and the NFS server is about half a
> millisecond. Jumbo frames are enabled.
> 
> Blades have 1 Gb link
> The NFS server has multiple 1Gb links, used for different shares
> Neither are close to full utilization, maybe 100Mb/s of traffic and 20
> 000 paquets/s at the server end

I have seen non-standard jumbo frames cause problems in the past.

Can you try unmounting shares on one client, setting the MTU to 1500, re-mount 
the shares and see how it works?

TCP between server and client will negotiate down to client's MSS so no need to 
change server's MTU.

-Ross

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Re: [CentOS] problem rebuilding kvm package on centos 5.5

[David Mansfield]

On Tue, 2010-06-22 at 09:25 -0700, Akemi Yagi wrote:
> On Tue, Jun 22, 2010 at 8:02 AM, David Mansfield  wrote:
> > Hi All:
> >
> > I'm trying to rebuild the kvm SRPM (kvm-83-164.el5_5.9.src.rpm)
> > on a centos 5.5 x86_64 and it's failing with the message:
> >
> > error: Failed build dependencies:
> >kernel-devel-x86_64 = 2.6.18-194.el5 is needed by kvm-83-164.9.x86_64
> >
> > I have already run "yum-builddep " and here is the output
> > (indicates nothing missing)
> 
> > kernel-devel-2.6.18-194.3.1.el5.x86_64
> > kernel-devel-2.6.18-194.el5.x86_64
> > No uninstalled build requires
> >
> > I can't figure how this missing dependency would be resolved?
> 
> It looks as if you have all required packages. Can you confirm that
> kernel-devel is indeed there?  What is the output from:
> 
> rpm -qa kernel\* | sort
> 

Note: the above "yum-builddep" sucked in the "kernel-xen-devel" for some
reason, not sure why.  Here's the output of the above:

kernel-2.6.18-194.3.1.el5
kernel-2.6.18-194.el5
kernel-devel-2.6.18-194.3.1.el5
kernel-headers-2.6.18-194.3.1.el5
kernel-xen-devel-2.6.18-194.3.1.el5

Thanks,
David


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Re: [CentOS] How to specify the default route?

[Les Mikesell]

On 6/22/2010 1:51 PM, Rick Thomas wrote:
> Thanks! to all who replied.
>
> I solved it by putting identical "GATEWAY=" clauses in each of
>
>   /etc/sysconfig/networking/devices/ifcfg-eth0
>   /etc/sysconfig/networking/devices/ifcfg-eth1
>
> This works without error, even though the gateway IP address in
> question is not accessible from eth1.
>
> I haven't tried taking the GATEWAY clause(s) out of the ifcfg files
> and moving it to the /etc/sysconfig/network file alone.  Does anybody
> know if that's the preferred configuration option?

It doesn't matter as long as there is only one.  You could just remove 
the GATEWAY line from ifcfg-eth1 and only specify it in ifcfg-eth0 since 
that is the only one that will work anyway.  The only reason to specify 
a GATEWAY on other interfaces would be if you sometimes have one active 
and sometimes another and each network has a router that will work as a 
default.

-- 
   Les Mikesell
 lesmikes...@gmail.com
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Re: [CentOS] OT: Recommendation for a good Internationalized terminalsoftware

[Jason Pyeron]

> -Original Message-
> From: Digimer
> Sent: Tuesday, June 22, 2010 7:24
> Subject: [CentOS] OT: Recommendation for a good Internationalized
terminalsoftware
> 
> Hi all,
> 
>We've got server-based application that runs on CentOS. 
> Until now, most of our customer's end-users have accessed the 
> application using either PuTTY or Teraterm. I was asked 

Teraterm, being a japenese software product, should support it, in utf8 mode.

> yesterday to try and find internationalized add ons or 
> alternatives for our new Asian customers (Japan, Korea and China atm).
> 
>I figured if anyone would be able to recommend terminal 
> emulation programs, it'd be you guys. So, would anyone be 
> able to recommend any windows-based, Asian character set 
> telnet/ssh terminal apps?
> 
>Thanks! Sorry for being a bit off topic, too. :)
> 
> --
> Digimer
> E-Mail: li...@alteeve.com
> AN!Whitepapers: http://alteeve.com
> Node Assassin:  http://nodeassassin.org
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Re: [CentOS] problem rebuilding kvm package on centos 5.5

[William Hooper]

On Tue, Jun 22, 2010 at 3:02 PM, David Mansfield  wrote:
> On Tue, 2010-06-22 at 09:25 -0700, Akemi Yagi wrote:
>> On Tue, Jun 22, 2010 at 8:02 AM, David Mansfield  
>> wrote:
>> > Hi All:
>> > error: Failed build dependencies:
>> >        kernel-devel-x86_64 = 2.6.18-194.el5 is needed by 
>> > kvm-83-164.9.x86_64
>> rpm -qa kernel\* | sort
>>
>
> Note: the above "yum-builddep" sucked in the "kernel-xen-devel" for some
> reason, not sure why.  Here's the output of the above:
>
> kernel-2.6.18-194.3.1.el5
> kernel-2.6.18-194.el5
> kernel-devel-2.6.18-194.3.1.el5
> kernel-headers-2.6.18-194.3.1.el5
> kernel-xen-devel-2.6.18-194.3.1.el5

The message says it is looking for kernel-devel-2.6.18-194.el5, but
you only have kernel-devel-2.6.18-194.3.1.el5.  Note the extra "3.1".

-- 
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Re: [CentOS] How to specify the default route?

[Rick Thomas]

So I tried moving the GATEWAY clause into etc/sysconfig/network and  
out of the individual ifcfg-eth? files.  It works.

So I guess that's the preferred solution, because it puts the  
information in a single place.  There's no need to make sure two or  
more places are synchronized if anything changes.

Thanks to all!

Rick

On Jun 22, 2010, at 2:51 PM, Rick Thomas wrote:

> Thanks! to all who replied.
>
> I solved it by putting identical "GATEWAY=" clauses in each of
>
>   /etc/sysconfig/networking/devices/ifcfg-eth0
>   /etc/sysconfig/networking/devices/ifcfg-eth1
>
> This works without error, even though the gateway IP address in  
> question is not accessible from eth1.
>
> I haven't tried taking the GATEWAY clause(s) out of the ifcfg files  
> and moving it to the /etc/sysconfig/network file alone.  Does  
> anybody know if that's the preferred configuration option?
>
> Thanks!
>
> Rick
>
>> El lun, 21-06-2010 a las 19:57 -0400, Rick Thomas escribió:
>>> I have a machine with two net interfaces.
>>>
>>> it seems to always pick the wrong one (eth1) as the default route.
>>>
>>> I can change it with
>>>
>>> route del default
>>> route add default eth0
>>>
>>> after it's up (or in rc.local, of course), but I'd like to figure  
>>> out
>>> what I need to do this "the CentOS way" (e.g. edit some  
>>> configuration
>>> file? Run some config utility, what?) once and for all.
>>>
>>> Can somebody point me to the canonical documentation on the subject?
>>> I've searched /usr/share/doc and the man pages, but I can't find
>>> anything useful.
>>>
>>> Googling for "default route centos" gives some interesting stuff,  
>>> but
>>> nothing definitive.
>
>
>

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Re: [CentOS] XFS on CentOS

[Peter Kjellstrom]

On Tuesday 22 June 2010, Athmane Madjoudj wrote:
> On 06/22/2010 04:57 PM, Boris Epstein wrote:
> > Hi all,
> >
> > Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
> > OpenSUSE) CentOS does not come with XFS support by default but rather
> > requires custom modifications after the install in order for you to be
> > able to support XFS on your CentOS machine? Just seems a little odd
> > given how much CentOS is oriented to be used as a server OS.
> >
> > Thanks.
>
> AFAIK, XFS kernel, modules and utils are available in CentOSPlus[1] repo

This is not correct anymore. The kernel module is in the normal kernel 
(atleast in 5.4 and 5.5) and the xfsprogs package is in CentOS-extras.

Note that XFS is not available for i386 since it has problems with 4K kernel 
stacks (in some situations).

/Peter

> [1] http://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus


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Re: [CentOS] XFS on CentOS

[Peter Kjellstrom]

On Tuesday 22 June 2010, Boris Epstein wrote:
> Hi all,
>
> Does anybody know why unlike so many Linux distros (Fedora, Ubuntu,
> OpenSUSE) CentOS does not come with XFS support by default

It does, try "modinfo xfs" or "yum list xfsprogs".

> but rather 
> requires custom modifications after the install in order for you to be
> able to support XFS on your CentOS machine?

It's not available in the installer since it's considered a "technology 
preview" by Redhat.

/Peter

> Just seems a little odd 
> given how much CentOS is oriented to be used as a server OS.
>
> Thanks.
>
> Boris.


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Re: [CentOS] XFS on CentOS

[Miguel Medalha]

> It's not available in the installer since it's considered a "technology
> preview" by Redhat.
>

... which causes no problem whatsoever. It is normally used for data 
partitions, not system partitions.
One can install the OS and then create the necessary partitions with XFS.
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Re: [CentOS] NFS exports network mask

[James Pearson]

Carlos S wrote:
> Thanks James.
> 
> So does exports list has any priority for loading config. e.g. I have
> general rule as 10.0.0.0/16 for read-only and then 10.0.0.20 as
> read-write. Then 10.0.0.20 overrides (default) 10.0.0.0/16 options?

I don't believe the order is important - however, I suggest you test it 
out to confirm.

James
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Re: [CentOS] New kernel causes hardware error?

[Eric Deis]

Thanks Guys!

Your advice helped me fix the problem.

Yes, it was the motherboard that was the issue. I update the firmware 
and must have had some microcode fixes to support my CPU (John mentioned 
the memory controller is in the CPU for Xeon 5500).

Now upon reboot using 2.6.18-194.3.1.el5 no errors are found in mcelog.

I will do some further testing, but think that I'm in the clear.


Thank you so much! I spent hours googling trying to find a solution to 
this, couldn't find the error reported anywhere else. Glad to have some 
people I can turn to for advice.


All the best,
eric



Tsuyoshi Nagata wrote:
> Hi! Eric
> (2010/06/22 13:11), Eric Deis wrote:
>   
>> Transaction: Address/Command error
>> 
>
> Its mother board (memory controller) problem.
> Its *not* DIMM problem.(memtest can't detect this error.)
> your data transfer(read/write) sometimes met bit errors.
> This is Nehalem cpu's error detecting feature.(MCE)
>
> Try new mother board,
> or your MB always indicates this error in latest kernel,
> Its time to buy certified vendors hardware.
>
> Supermicro's MB is not certified hardware, but
> she just indicates hardware problem.
>
> Tsuyoshi.
>   
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[CentOS] 2 DVDs for CentOS 5.5

[David McGuffey]

Just finished downloading the DVD with bittorrent. Ended up with two iso
files (1 of 2 and 2 of 2).  sha1sum checks out on both.

This is the first time I've encountered two DVDs.  Will the install
politely ask for DVD #2 when it is time?



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Re: [CentOS] 2 DVDs for CentOS 5.5

[Baird, Josh]

DVD2 only contains OpenOffice packages.  Unless you need to install these from 
the DVD, you should be fine without DVD 2.
 
Josh



From: centos-boun...@centos.org on behalf of David McGuffey
Sent: Tue 6/22/2010 9:46 PM
To: CentOS mailing list
Subject: [CentOS] 2 DVDs for CentOS 5.5



Just finished downloading the DVD with bittorrent. Ended up with two iso
files (1 of 2 and 2 of 2).  sha1sum checks out on both.

This is the first time I've encountered two DVDs.  Will the install
politely ask for DVD #2 when it is time?



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Re: [CentOS] NFS exports network mask

[Carlos S]

Had to put exclusive IP address before subnet-masked entry. Thanks for
the pointers.

--
CS.

On Tue, Jun 22, 2010 at 5:06 PM, James Pearson
 wrote:
> Carlos S wrote:
>>
>> Thanks James.
>>
>> So does exports list has any priority for loading config. e.g. I have
>> general rule as 10.0.0.0/16 for read-only and then 10.0.0.20 as
>> read-write. Then 10.0.0.20 overrides (default) 10.0.0.0/16 options?
>
> I don't believe the order is important - however, I suggest you test it out
> to confirm.
>
> James
>
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