[Pacemaker] Pacemaker/Corosync on Ubuntu 12.04

[Andrew Beekhof]

On 02/05/2013, at 8:21 AM, Andrew Martin <amartin at xes-inc.com> wrote:

> ----- Original Message -----
>> From: "Robert Parsons" <rparsons at tappublishing.com>
>> To: "The Pacemaker cluster resource manager" <pacemaker at oss.clusterlabs.org>
>> Sent: Wednesday, May 1, 2013 4:03:46 PM
>> Subject: [Pacemaker] Pacemaker/Corosync on Ubuntu 12.04
>> 
>> 
>> 
>> We're wanting to build a web server farm with approx 18 nodes. We're
>> aware of scalability issues with Corosync/Pacemaker but we're also
>> told
>> that it is getting better with newer versions of the software. Ubuntu
>> 12.04 is packaged with corosync 1.4.2 and pacemaker 1.1.6.  I imagine
>> that we'll probably need to remove the packages and compile from
>> source
>> to get the later versions.  What is the latest version suitable for
>> production?

I'd suggest a 1.1.10 release candidate.
I would have said 1.1.9 but there were some unfortunate memory leaks :-(

>> 
>> Also, does anyone have any suggestion for tuning Corosync to scale to
>> 18-24 nodes, running 18 services?

Generally you just want to back off on the token/membership timeouts.

>> 
>> Thanks for any help.
>> 
>> --
>> Robert Parsons
>> Chief Information Officer
>> TAP Publishing Company
>> 174 Fourth St
>> Crossville, TN 38557-0509
>> 931-484-5137
>> 
>> 
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>> Getting started:
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>> 
> Robert,
> 
> I have also been using Ubuntu 12.04 for Corosync/Pacemaker clusters. I've found 
> that the feature series (1.1.x) of Pacemaker has too many changes/bugs to be used 
> in a production environment, so I am waiting for the next stable series, 1.2.0.

Development on 1.1 is really winding down, I dare say 1.1.10 will be very close to 1.2.0

> I
> have also been working to build updated packages of Corosync and Pacemaker for
> Ubuntu 12.04, which you can find in this PPA:
> https://launchpad.net/~asmartin/+archive/cluster-stable
> 
> The Corosync 2.x series has some important improvements regarding quorum and 
> membership data, so it is the version I would prefer to use in clusters going
> forward. See this article for more information:
> http://blog.clusterlabs.org/blog/2012/pacemaker-and-cluster-filesystems/
> 
> Thanks,
> 
> Andrew
> 
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