Upgrading the Base OS in an M3 Anvil! Cluster
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Alteeve Wiki :: How To :: Upgrading the Base OS in an M3 Anvil! Cluster |
Overview
This article covers rebuilding an Anvil! to upgrade or change the base operating system of all the machines in the cluster.
In short, the process will be to remove each machine from the cluster, reinstall the new OS, and integrate it back into the cluster. We'll do Strikers, Subnodes and a DR host.
This tutorial will also serve as a guide to rebuilding a machine that failed and was replaced. The only difference will be that the installed OS will stay the same.
For this tutorial, we will be updating from CentOS Stream 8 to AlmaLinux 9. The process should work between RHEL, as either the source and/or the destination OS.
Updating
Whether replacing a machine that failed, or upgrading, it is critically important to update the cluster first. This will ensure that the versions of applications installed on the rebuilt machine matches / is compatible with the versions to be installed on the rebuilt systems.
If All Machines Are Online
If you're doing a planned update, and all machines in the Anvil! cluster is online, you can use striker-update-cluster.
This is the scenario we will be covering in this tutorial. If you are replacing a failed machine, see:
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