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Re: [Linux-cluster] Xen / Redhat cluster : 5.3 to 5.4 upgrade question and best practice

On Wed, Feb 10, 2010 at 4:31 PM, F M <dist-list lexum umontreal ca> wrote:
I need to upgrade a Xen cluster using RH servers from 5.3 to 5.4.

It is a 3 nodes cluster (+qdisk) and 1 luci server for management.

All VM are in a GFS2 FS in /home/domU/FQDN folders.

Each FQDN folder contains :
-The xen config file
-the VM FQDN.img  file

I read about some issues with rgmanager from 5.4 (unable to create VM config files that were not in /etc/xen). This bug has been fixed in rgmanager-2.0.52-1.el5_4.1
Can I safely apply the update without modifying any config made with 5.3 ? Do I need to tweak the cluster.conf between 5.3 and 5.4 ?

I had to add use_virsh="0"  in cluster.conf to start vm as a cluster service.

Like this:
<vm autostart="1" domain="fd1" exclusive="0" hypervisor="xen" max_restarts="0" migrate="live" name="abc.domain.com" path="/guests" recovery="restart" restart_expire_time="0" use_virsh="0"/>


Is it better to upgrade the luci server before the nodes ?

I am also curious about the nodes, what is the best practice : moving VM , removing the node from the cluster, upgrading and then reboot, see if everything is fine and go for the next one after that ? Can I stay with a mix of 5.3 and 5.4 for several days ?



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