[ClusterLabs] Upgrade to OLE8 + Pacemaker

[Jibrail, Qusay (GfK)]

Hello,

I am aiming for upgrading one of the cluster node to OLE8 (current version OLE7) and test if postfix is working fine.
If yes then upgrade the second node to OLE8.

My questions:
Will Pacemaker configuration works after the upgrade?
Do I need to make any changes before or after the upgrade to OLE8?
So server3 will be done first and then server4. Is that the right order?
Do I need to stop any services before the upgrade?

[root at server3 ~]# pacemakerd --version
Pacemaker 1.1.23-1.0.1.el7_9.1
Written by Andrew Beekhof

[root at server3 ~]# pcs status
Cluster name: xxxxxxxxxx
Stack: corosync
Current DC: server3 (version 1.1.23-1.0.1.el7_9.1-9acf116022) - partition with quorum
Last updated: Tue Oct  3 07:29:46 2023
Last change: Sun May  1 17:02:03 2022 by hacluster via crmd on server3

2 nodes configured
2 resource instances configured

Online: [ server3 server4 ]

Full list of resources:

Clone Set: smtpout-postfix-res-clone [smtpout-postfix-res]
     Started: [ server3 server4 ]

Daemon Status:
  corosync: active/enabled
  pacemaker: active/enabled
  pcsd: active/enabled

[root at server3 ~]# postconf -d | grep mail_version
mail_version = 2.10.1
milter_macro_v = $mail_name $mail_version

[root at server3 ~]# lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch
Distributor ID: OracleServer
Description:    Oracle Linux Server release 7.9
Release:        7.9
Codename:       n/a

Kind regards,
––
Qusay Jibrail
Senior Infrastructure Engineer – Linux | GfK IT Services
GfK – an NIQ company | The Netherlands
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