What's the preferred approach to upgrade the MariaDB nodes?
We currently have a 4-node master-3slaves MariaDB 10.1.40 setup. We forced the version to 10.1.40 because replication would no longer work on 10.1.41 (which is a known problem).
We would like to upgrade to 10.2 or 10.3 at some point in the near future.
How should I do this? Does CluCo have any functionality to help with this?
While ClusterControl can upgrade minor versions of the databases, major version upgrades are intentionality not supported. This is not a process you should just run without proper preparations. The upgrade process, typically, is explained in MariaDB documentation. For example: https://mariadb.com/kb/en/library/upgrading-from-mariadb-101-to-mariadb-102/. You have to find the documentation relevant to what you want to do. It might be that the upgrade path will be 10.1 -> 10.2 -> 10.3. You should properly test your application on the new version to avoid possible incompatibilities. Major version upgrades are definitely more time consuming and you should take your time to prepare for it and verify that upgrade will not break your environment.Comment actions
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