Hello List,
i have a question about upgrading an Ubuntu 18.04 FailOver System and hope to get some good hints.
- OS Ubuntu 18.04
- corosync 2.4.3
- pacemaker 1.1.18
- haproxy 1.8.8
I have a quite simple system. 2 members in a failover-cluster. I have 2 primitives configured, thats an IP and haproxy. both are grouped to have them active on same member. I followed typical webtutorials.
/etc/corosync/corosync.conf is minimalistic https://pastebin.com/tCLrXYrg
This works without problems for around 4 years.
Now i plan to do an OS Upgrade to Ubuntu 20.04 and reuse my failovermembers. I could also build a new cluster with new Ubuntu 22.04 servers, but i want to try the upgrade first.
Ubuntu 20.04 would have these versions:
- pacemaker 2.0.3
- corosync 3.0.3
- haproxy 2.0.29
Version from 18.04 and 20.04 differ considerable.
I read this document https://clusterlabs.org/pacemaker/doc/2.1/Pacemaker_Administration/html/upgrading.html
But iam still not sure to use the Rolling (7.2.2) or the Detach and Reattach (7.2.3) way. May be Detach and Reattach is more appropriate to my scenario.
The thing is to get the cluster working after 1 node is upgraded to make sure primitives/services are able to switch to upgraded host.
Or do you suggest building a new cluster with new servers, because versions from 18.04/20.04 differ to much?
Thank you,
Hajo
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