[Linux-cluster] Guidelines on Upgrades

[Brett Delle Grazie]

Hi,

On Tue, 2010-08-17 at 10:52 -0400, Ben Turner wrote:
> Rolling update from 5.x zstream to 5.x+1 should work.  For example 5.5z to 5.6 should work with rolling updates but 5.4 to 5.6 may have problems.
> 

Just be sure to keep cman and lvm2-cluster in sync on a single node
(i.e. update _both_ to current versions). Otherwise you'll lose your
clustered (GFS/GFS2) file systems due to breaking internal API changes
(socket where clvmd reads/writes from).  This means you _will_ need
access to cluster and cluster-storage repos in RHN.

Current CMAN in RHEL5.5 updates will break clustered file systems if you
do not have the appropriate lvm2-cluster rpm to match.

See the changelog on cman for details.

> -Ben
> 
> 
> 
> ----- Original Message -----
> From: "Mikko Partio" <mpartio at gmail.com>
> To: "linux clustering" <linux-cluster at redhat.com>
> Sent: Saturday, August 14, 2010 1:18:51 AM GMT -05:00 US/Canada Eastern
> Subject: Re: [Linux-cluster] Guidelines on Upgrades
> 
> 
> 
> 
> 
> On Sat, Aug 14, 2010 at 12:11 AM, Robert Hayden < rhayden.public at gmail.com > wrote: 
> 
> 
> Looking for guidelines on when RHCS components can be upgraded in a rolling fashion and when it is best to simply take a full cluster downtime. I am looking at 2-6 node clusters with each node providing a unique set of functions along with common functions. Each node has a dedicated failover node(s). 
> 
> A couple of examples: 
> Minor OS upgrades, e.g. RHEL 5.3 to RHEL 5.5 
> Major OS upgrades, e.g. RHEL 5.x to RHEL 6.x 
> Errata for key cluster component, e.g. openais, cman, etc, without kernel updates 
> 
> 
> 
> My understanding is that major upgrade require rebuilding the cluster from scratch, ie. no upgrade is possible. And with minor upgrades, I've tried doing rolling upgrades and sometime they do work and sometime don't. The problem is that you don't know which upgrades will work, so my current approach is just to upgrade the whole cluster at a time. Sure, requires some downtime (5-15 minutes) but that's better than having a freezed cluster requiring hours of work to get back online. 
> 
> 
> Just my $0.02. 
> 
> 
> Regards 
> 
> 
> Mikko 
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> 
> 

-- 
Best Regards,

Brett Delle Grazie

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