[CentOS] What is the best way to setup Auto Failover Redundancy for Vicidial with Asterisk on CentOS or other Linux OS?

[Sam Acosta]

There seems obviously quite a lot of possible setup for server clustering
and redudancy, but let's say considering about three mid-range servers only
with FoneBridge --- What could be the best way to setup Auto Failover
Redundancy for Vicidial with Asterisk on CentOS or other Linux OS?

Sam



www.SamAcosta.Net
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Re: [CentOS] simple NFSv4 setup

[Kwan Lowe]

On Wed, Nov 18, 2009 at 5:18 PM, Joshua Baker-LePain  wrote:
> On Wed, 18 Nov 2009 at 4:05pm, Tim Nelson wrote
>
>> - "Joshua Baker-LePain"  wrote:
>
>>> /export         $CLIENT(ro,fsid=0)
>>> /export/qb3     $CLIENT(rw,nohide)
>
>> Your export:
>>
>> /export/qb3     $CLIENT(rw,nohide)
>>
>> And your mount:
>>
>> mount -t nfs4 $SERVER:/qb3 /usr/local/sge62/qb3
>>
>> The remote path is wrong. Either that's a typo or could be the cause of
>> your problem?
>
> No, that's how NFSv4 mounts work -- it's relative to the pseudo-root (the
> fsid=0 entry) on the server.  And the mount succeeds.  But it's a
> read-only mount, where it should be rw.
>

Not sure if this applies in your FS4 setup, but most of my NFS
permissions errors have stemmed from user ID mismatches on the host
server.  My NFS4 mounts are not using any true NFS4 features, however.
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[CentOS] stupid Centos-DS questions

[Alan McKay]

OK, I'm mostly through everything up to and including Chapter 5 in
http://www.redhat.com/docs/manuals/dir-server/8.1/install/Installation_Guide-Advanced_Configuration-Making-DS.html

And looking through the ToC for the rest, I do not see that my
questions will be answered by this doc.  So please feel free to point
me to other docs.

This manual seems to assuming I already know what it is I want to do,
and what "Directory Services" are all about.   Invalid assumption.

For example, right now I am reading about how to set up different
instances of this-or-that (Admin Server, Directory Server, yadda,
yadda).   What it does not tell me is why I would want to do that.  It
does not even tell me "what is an 'instance'" .

I've never done any sort of DS, so this is all new stuff to me.
Suggested reading is very welcomed.

What is even more welcome is pointers to case studies or template
examples.   We are a very small company with only about 30 people
right now.  Though we do have a convoluted network with 3 distinct
network areas separated by VPNs.  I'm new here (and put in charge),
and we are not even running DNS yet (eeep!  for REALZ!!!).   To me it
makes sense to have 3 different DNS subdomains because of some quirks
they have in their product architecture here.   I'm thinking
"office.example.dom", "production.example.com" and "rc.example.com".
And from the bit I've read so far on DS, it seems to be recommended to
have your DS mirror your DNS.   So we are small enough where I do not
think we need more than 1 server to run it all.  And I can make all
the machines talk to that server through the firewalls separating the
3 zones.  That is not an issue at all.   I'm not sure how this affects
my DS.   Would these be "instances"?

So many questions ... please suggest reading material.

thanks,
-Alan

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[CentOS] ATA error: hard drive going bad?

[Gilbert Sebenste]

Hello all,

Probably a stupid question, but I'll ask the pros just to be sure. Time 
for a new hard drive?



Nov 16 17:35:42 weather3 kernel: ata1.01: exception Emask 0x40 SAct 0x0 
SErr 0x80800 action 0x6
Nov 16 17:35:42 weather3 kernel: ata1: SError: { HostInt 10B8B }
Nov 16 17:35:42 weather3 kernel: ata1.01: cmd 
a0/00:00:00:00:00/00:00:00:00:00/b0 tag 0
Nov 16 17:35:42 weather3 kernel:  cdb 00 00 00 00 00 00 00 00  00 
00 00 00 00 00 00 00
Nov 16 17:35:42 weather3 kernel:  res 
51/20:03:00:00:00/00:00:00:00:00/b0 Emask 0x40 (internal error)
Nov 16 17:35:42 weather3 kernel: ata1.01: status: { DRDY ERR }
Nov 16 17:35:42 weather3 kernel: ata1: hard resetting link
Nov 16 17:35:43 weather3 kernel: ata1: SATA link up 1.5 Gbps (SStatus 113 
SControl 300)
Nov 16 17:35:43 weather3 kernel: ata1.01: configured for UDMA/100
Nov 16 17:35:43 weather3 kernel: ata1: EH complete

---

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(My opinions only!)  **
***
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Re: [CentOS] stupid Centos-DS questions

[Alan McKay]

OK, with some URL hacking I found this -

http://www.redhat.com/docs/manuals/dir-server/8.1/admin/index.html

Staring into it ...

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[CentOS] Oracle RAC 9i on RH AS 4 Update 5

[Wahyu Darmawan]

Hi all,
I've got problem when run command "gsdctl start", and appeared error like this :
/home/oracle/jre/1.1.8/bin/../lib/i686/native_threads/libzip.so:
symbol errno, version GLIBC_2.0 not defined in file libc.so.6 with
link time reference (libzip.so)
Unable to initialize threads: cannot find class java/lang/Thread
Could not create Java VM

Does anyone can help me? Appreciate with your response.

Thank you,
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Re: [CentOS] ATA error: hard drive going bad?

[Eero Volotinen]

Gilbert Sebenste wrote:
> Hello all,
> 
> Probably a stupid question, but I'll ask the pros just to be sure. Time 
> for a new hard drive?

Usually is when errors occur. You can get more information about drive's 
health using smartctl -a /dev/device

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Re: [CentOS] Oracle RAC 9i on RH AS 4 Update 5

[Eero Volotinen]

Wahyu Darmawan wrote:
> Hi all,
> I've got problem when run command "gsdctl start", and appeared error like 
> this :
> /home/oracle/jre/1.1.8/bin/../lib/i686/native_threads/libzip.so:
> symbol errno, version GLIBC_2.0 not defined in file libc.so.6 with
> link time reference (libzip.so)
> Unable to initialize threads: cannot find class java/lang/Thread
> Could not create Java VM
> 
> Does anyone can help me? Appreciate with your response.

Please, provide output from oracle logs.

Anyway, I think that something required package is not installed. Did 
you follow oracle documentation?

You can also get answer from oracle support about this issue.

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Re: [CentOS] Oracle RAC 9i on RH AS 4 Update 5

[nate]

Wahyu Darmawan wrote:

> Does anyone can help me? Appreciate with your response.

Go talk to Oracle, that's a big reason someone would go with
a company like Oracle is the support.

Make sure your configuration is on their supported list as
well.

nate



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Re: [CentOS] Oracle RAC 9i on RH AS 4 Update 5

[m . roth]

> Hi all,
> I've got problem when run command "gsdctl start", and appeared error like
> this :
> /home/oracle/jre/1.1.8/bin/../lib/i686/native_threads/libzip.so:
> symbol errno, version GLIBC_2.0 not defined in file libc.so.6 with
> link time reference (libzip.so)
> Unable to initialize threads: cannot find class java/lang/Thread
> Could not create Java VM
>
> Does anyone can help me? Appreciate with your response.

Looks like either what others have said, that some package is missing, or
that your environment's not right. Is LD_LIBRARY_PATH set correctly? How
'bout JAVA_HOME?

  mark

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Re: [CentOS] stupid Centos-DS questions

[Les Mikesell]

Alan McKay wrote:
> OK, I'm mostly through everything up to and including Chapter 5 in
> http://www.redhat.com/docs/manuals/dir-server/8.1/install/Installation_Guide-Advanced_Configuration-Making-DS.html
> 
> And looking through the ToC for the rest, I do not see that my
> questions will be answered by this doc.  So please feel free to point
> me to other docs.
> 
> This manual seems to assuming I already know what it is I want to do,
> and what "Directory Services" are all about.   Invalid assumption.
> 
> For example, right now I am reading about how to set up different
> instances of this-or-that (Admin Server, Directory Server, yadda,
> yadda).   What it does not tell me is why I would want to do that.  It
> does not even tell me "what is an 'instance'" .
> 
> I've never done any sort of DS, so this is all new stuff to me.
> Suggested reading is very welcomed.
> 
> What is even more welcome is pointers to case studies or template
> examples.   We are a very small company with only about 30 people
> right now.  Though we do have a convoluted network with 3 distinct
> network areas separated by VPNs.  I'm new here (and put in charge),
> and we are not even running DNS yet (eeep!  for REALZ!!!).   To me it
> makes sense to have 3 different DNS subdomains because of some quirks
> they have in their product architecture here.   I'm thinking
> "office.example.dom", "production.example.com" and "rc.example.com".
> And from the bit I've read so far on DS, it seems to be recommended to
> have your DS mirror your DNS. 

You don't _have_ to delegate DNS subdomains off to different servers or 
make different zone files for them.  It just provides a hierarchical 
branch point if different people will be managing the namespace.  If it 
is all managed together, it is fine to have records for 
a.office.example.com and a.production.example.com all in the zone file 
for example.com.

-- 
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lesmikes...@gmail.com

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[CentOS] my mail is refusing messages

[Nelson Gonzaga]

Hi there,
I trying to send e-mail using this:

mail -s "maillog" ngonz...@yahoo.com < /var/log/maillog

but sendmail refused and I don't know why, see my maillog:

Nov 19 14:31:33 servertdoc sendmail[11258]: nAJGVXXi011258: from=root, 
size=353085, class=0, nrcpts=1, 
msgid=<200911191631.najgvxxi011...@servertdoc.toshiba.fmg>, relay=r...@localhost

Nov 19 14:31:33 servertdoc sendmail[11258]: nAJGVXXi011258: 
to=ngonz...@yahoo.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, 
mailer=relay, pri=383085, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, 
stat=Deferred: Connection refused by [127.0.0.1]

There is some wrong setup, what can be?


  

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Re: [CentOS] my mail is refusing messages

[Eero Volotinen]

Nelson Gonzaga wrote:
> Hi there,
> I trying to send e-mail using this:
> 
> mail -s "maillog" ngonz...@yahoo.com  < 
> /var/log/maillog
> 
> but sendmail refused and I don't know why, see my maillog:
> 
> Nov 19 14:31:33 servertdoc sendmail[11258]: nAJGVXXi011258: from=root, 
> size=353085, class=0, nrcpts=1, 
> msgid=<200911191631.najgvxxi011...@servertdoc.toshiba.fmg>, 
> relay=r...@localhost
> 
> Nov 19 14:31:33 servertdoc sendmail[11258]: nAJGVXXi011258: 
> to=ngonz...@yahoo.com, ctladdr=root (0/0), delay=00:00:00, 
> xdelay=00:00:00, mailer=relay, pri=383085, relay=[127.0.0.1] 
> [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
> 
> There is some wrong setup, what can be?

Yes, you need to setup smarthost correctly and start sendmail ..

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RHCE
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Re: [CentOS] my mail is refusing messages

[Robert]

Eero Volotinen wrote:
> Nelson Gonzaga wrote:
>   
>> Hi there,
>> I trying to send e-mail using this:
>>
>> mail -s "maillog" ngonz...@yahoo.com  < 
>> /var/log/maillog
>>
>> but sendmail refused and I don't know why, see my maillog:
>>
>> Nov 19 14:31:33 servertdoc sendmail[11258]: nAJGVXXi011258: from=root, 
>> size=353085, class=0, nrcpts=1, 
>> msgid=<200911191631.najgvxxi011...@servertdoc.toshiba.fmg>, 
>> relay=r...@localhost
>>
>> Nov 19 14:31:33 servertdoc sendmail[11258]: nAJGVXXi011258: 
>> to=ngonz...@yahoo.com, ctladdr=root (0/0), delay=00:00:00, 
>> xdelay=00:00:00, mailer=relay, pri=383085, relay=[127.0.0.1] 
>> [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
>>
>> There is some wrong setup, what can be?
>> 
>
> Yes, you need to setup smarthost correctly and start sendmail ..
>   
I recently solved this one using a small program named "email", 
available at http://www.cleancode.org/projects/email

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Re: [CentOS] stupid Centos-DS questions

[Alan McKay]

This is the sort of thing that leaves me baffled :

http://www.redhat.com/docs/manuals/dir-server/8.1/admin/Creating_Directory_Entries.html

It tells me the following, but does not really provide a context for
me as to why I'd want to do this or how this would relate to the
real-world problem I am trying to solve.   I think I'm going to have
to pick up a copy of the LDAP book someone mentioned a while back in
another of my threads.

3.1.1. Creating a Root Entry
Each time a new database is created, it is associated with the suffix
that will be stored in the database. The directory entry representing
that suffix is not automatically created.
To create a root entry for a database:


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[CentOS] New install RAID 1+0

[Craig White]

I have a new server to setup. 4 hard drives and I had intended it to be
hardware raid but that's a long story.

Does it make sense to set up the first two hard drives with RAID-0
partitions and then get through the install and then go back later and
then create identically sized RAID-0 partitions on the other two drives
and finally create the RAID-1 mirror from the first to the second?

Craig


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Re: [CentOS] stupid Centos-DS questions

[S.Tindall]

On Thu, 2009-11-19 at 12:31 -0500, Alan McKay wrote:
> This is the sort of thing that leaves me baffled :
> 
> http://www.redhat.com/docs/manuals/dir-server/8.1/admin/Creating_Directory_Entries.html
> 
> It tells me the following, but does not really provide a context for
> me as to why I'd want to do this or how this would relate to the
> real-world problem I am trying to solve.   I think I'm going to have
> to pick up a copy of the LDAP book someone mentioned a while back in
> another of my threads.

Alan,

Yes, RH documentation can be a little terse.


Look at the fedora 389 directory server (aka fedora directory server)
documentation:

http://directory.fedoraproject.org/wiki/Documentation


There is also a brief writeup on LDAP architecture there:

http://directory.fedoraproject.org/wiki/Architecture


Steve



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Re: [CentOS] New install RAID 1+0

[John R Pierce]

Craig White wrote:
> I have a new server to setup. 4 hard drives and I had intended it to be
> hardware raid but that's a long story.
>
> Does it make sense to set up the first two hard drives with RAID-0
> partitions and then get through the install and then go back later and
> then create identically sized RAID-0 partitions on the other two drives
> and finally create the RAID-1 mirror from the first to the second?
>   

are we to assume that your 'long story' involves this *not* being 
hardware raid?  so you're setting this up with mdraid?  or what?

if mdraid, I'd probably boot the CD (or PXE) to rescue mode, use fdisk 
and mdadm to partition and raid the drives as you like, then reboot the 
CD/PXE into normal install mode, and install onto the md devices you 
pre-created.

oh, and you normally build two mirrors (raid1) then stripe them together 
(raid0) rather than the other way around.


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Re: [CentOS] stupid Centos-DS questions

[Alan McKay]

On Thu, Nov 19, 2009 at 1:40 PM, S.Tindall
 wrote:
> Look at the fedora 389 directory server (aka fedora directory server)
> documentation:

thanks - on my way!


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Re: [CentOS] New install RAID 1+0

[Ron Loftin]

On Thu, 2009-11-19 at 11:30 -0700, Craig White wrote:
> I have a new server to setup. 4 hard drives and I had intended it to be
> hardware raid but that's a long story.
> 
> Does it make sense to set up the first two hard drives with RAID-0
> partitions and then get through the install and then go back later and
> then create identically sized RAID-0 partitions on the other two drives
> and finally create the RAID-1 mirror from the first to the second?

I suggest that you consider LVM over RAID 1.

Since you have 4 disks, I would make a small RAID 1 on your first two
disks ( or if you are using IDE disks, the primary and secondary
masters ) to be /boot ( GRUB doesn't work with booting directly from
LVM ) and then create one or more RAID 1 devices in the remaining space.
You then use the RAID 1 devices as physical volumes in the LVM setup,
and create logical volumes however you wish.

My own "personal opinion" is that I use one RAID 1 device to support a
volume group that I call "sysdisk" and use for "system" filesystems such
as /, /var, /tmp, and swap.  I use any additional RAID 1 devices in a
volume group I call "export" and put all of my data ( home directories,
downloaded audio/visual media, ISO images, etc. ) in logical
volumes/filesystems there.

One of the benefits of LVM is that you can have more than one physical
volume ( PV ) in a volume group, which will let you construct logical
volumes ( LV ) that are larger than your hard disks.  You can also
resize LVs/filesystems and do some other useful things.

My $0.02 (US) worth.

> 
> Craig
> 
> 
-- 
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Re: [CentOS] New install RAID 1+0

[Craig White]

On Thu, 2009-11-19 at 10:42 -0800, John R Pierce wrote:
> Craig White wrote:
> > I have a new server to setup. 4 hard drives and I had intended it to be
> > hardware raid but that's a long story.
> >
> > Does it make sense to set up the first two hard drives with RAID-0
> > partitions and then get through the install and then go back later and
> > then create identically sized RAID-0 partitions on the other two drives
> > and finally create the RAID-1 mirror from the first to the second?
> >   
> 
> are we to assume that your 'long story' involves this *not* being 
> hardware raid?  so you're setting this up with mdraid?  or what?
> 
> if mdraid, I'd probably boot the CD (or PXE) to rescue mode, use fdisk 
> and mdadm to partition and raid the drives as you like, then reboot the 
> CD/PXE into normal install mode, and install onto the md devices you 
> pre-created.
> 
> oh, and you normally build two mirrors (raid1) then stripe them together 
> (raid0) rather than the other way around.

yes, mdraid

OK, noted... make them in raid-1 first - I gather all of the mdadm
commands will have to be done in the shell prior to install.

Thanks

Craig


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Re: [CentOS] simple NFSv4 setup

[Joshua Baker-LePain]

On Thu, 19 Nov 2009 at 9:21am, Kwan Lowe wrote

> Not sure if this applies in your FS4 setup, but most of my NFS
> permissions errors have stemmed from user ID mismatches on the host
> server.  My NFS4 mounts are not using any true NFS4 features, however.

My problem isn't a permissions issue -- it's the fact that the mount on 
the client is read-only.  And NFS4 doesn't rely on numerical UID/GID 
matching anymore.  It uses the username string (via rpc.idmapd).  In any 
case, both the usernames and UIDs/GIDs match on these two systems.

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Re: [CentOS] New install RAID 1+0

[Benjamin Franz]

Craig White wrote:
> I have a new server to setup. 4 hard drives and I had intended it to be
> hardware raid but that's a long story.
>
> Does it make sense to set up the first two hard drives with RAID-0
> partitions and then get through the install and then go back later and
> then create identically sized RAID-0 partitions on the other two drives
> and finally create the RAID-1 mirror from the first to the second?
>   

No. That just makes it so that if you have a failure you won't be able 
to boot, which kind of defeats the point of having a RAID array. Make 
your /boot partition a RAID1 partition right off the bat. That is so you 
can tell GRUB to boot from any of the drives. You can choose RAID10 
directly for the rest of your drive with the 5.4 installer.

-- 
Benjamin Franz

-- 
Benjamin Franz

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Re: [CentOS] New install RAID 1+0

[Craig White]

On Thu, 2009-11-19 at 10:54 -0800, Benjamin Franz wrote:
> Craig White wrote:
> > I have a new server to setup. 4 hard drives and I had intended it to be
> > hardware raid but that's a long story.
> >
> > Does it make sense to set up the first two hard drives with RAID-0
> > partitions and then get through the install and then go back later and
> > then create identically sized RAID-0 partitions on the other two drives
> > and finally create the RAID-1 mirror from the first to the second?
> >   
> 
> No. That just makes it so that if you have a failure you won't be able 
> to boot, which kind of defeats the point of having a RAID array. Make 
> your /boot partition a RAID1 partition right off the bat. That is so you 
> can tell GRUB to boot from any of the drives. You can choose RAID10 
> directly for the rest of your drive with the 5.4 installer.

yes, I understand about /boot

I didn't know that RAID-10 was an option now in the installer...problems
are solved

Thanks

Craig


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Re: [CentOS] stupid Centos-DS questions

[Rob Kampen]

Alan McKay wrote:

This is the sort of thing that leaves me baffled :

http://www.redhat.com/docs/manuals/dir-server/8.1/admin/Creating_Directory_Entries.html

It tells me the following, but does not really provide a context for
me as to why I'd want to do this or how this would relate to the
real-world problem I am trying to solve.   I think I'm going to have
to pick up a copy of the LDAP book someone mentioned a while back in
another of my threads.

3.1.1. Creating a Root Entry
Each time a new database is created, it is associated with the suffix
that will be stored in the database. The directory entry representing
that suffix is not automatically created.
To create a root entry for a database:

  

Alan,
I have Gerald Carters Book - published by O'reilly called "LDAP System 
Administration"
It gives a bit more of the stuff you're looking for as to: why do 
certain things?

It is openLDAP centric, thus will need to deal with the differences.
I have a plan to get my own LDAP working any day now (have installed 
CentOS DS on two machines - this is straight forward and works as per 
the wiki instructions) but not yet managed to get it playing nice.

HTH
Rob

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[CentOS] serial console config package?

[Jiann-Ming Su]

I've been installing CentOS via PXE and using a serial console
interface.  The installation works great.  I notice that during the
install process, the following line gets added automatically to
/etc/inittab:

  co:2345:respawn:/sbin/agetty ttyS0 9600 vt100-nav

Which package does this?  Is it kudzu?  Thanks for any insights.

-- 
Jiann-Ming Su
"I have to decide between two equally frightening options.
 If I wanted to do that, I'd vote." --Duckman
"The system's broke, Hank.  The election baby has peed in
the bath water.  You got to throw 'em both out."  --Dale Gribble
"Those who vote decide nothing.
Those who count the votes decide everything.”  --Joseph Stalin
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Re: [CentOS] serial console config package?

[Larry Brigman]

On Thu, Nov 19, 2009 at 12:42 PM, Jiann-Ming Su  wrote:
> I've been installing CentOS via PXE and using a serial console
> interface.  The installation works great.  I notice that during the
> install process, the following line gets added automatically to
> /etc/inittab:
>
>  co:2345:respawn:/sbin/agetty ttyS0 9600 vt100-nav
>
> Which package does this?  Is it kudzu?  Thanks for any insights.
>

It is probably anaconda during the kickstart due to what you have in
the kickstart
file for doing the serial install.
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Re: [CentOS] serial console config package?

[Jiann-Ming Su]

On Thu, Nov 19, 2009 at 3:51 PM, Larry Brigman  wrote:
> On Thu, Nov 19, 2009 at 12:42 PM, Jiann-Ming Su  wrote:
>> I've been installing CentOS via PXE and using a serial console
>> interface.  The installation works great.  I notice that during the
>> install process, the following line gets added automatically to
>> /etc/inittab:
>>
>>  co:2345:respawn:/sbin/agetty ttyS0 9600 vt100-nav
>>
>> Which package does this?  Is it kudzu?  Thanks for any insights.
>>
>
> It is probably anaconda during the kickstart due to what you have in
> the kickstart
> file for doing the serial install.

I'm pretty sure it's not anaconda.  I've been playing with the
kickstart file.  If I do a yum remove of some packages, that console
line does not get added to inittab.  Right now, I'm suspecting it's
kudzu since that's one of the packages I remove.


-- 
Jiann-Ming Su
"I have to decide between two equally frightening options.
 If I wanted to do that, I'd vote." --Duckman
"The system's broke, Hank.  The election baby has peed in
the bath water.  You got to throw 'em both out."  --Dale Gribble
"Those who vote decide nothing.
Those who count the votes decide everything.”  --Joseph Stalin
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Re: [CentOS] Why swap if there's still physical memory available

[Scott McClanahan]

> Also, the top values may not tell the whole story - RES should include 
> paged-in code plus memory allocated by the program.   VIRT includes code 
> not paged in yet and linked shared libraries, so the difference may not 
> all be in swap.
> 

I thought I remembered reading (maybe LKML) that RES also didn't account
for the COW efficiency of shared libraries.  Meaning RES could
potentially show a value which is larger than actual physical memory
used.  Sorry if I'm spreading misinformation :)

Thanks. 

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