Mixed cluster with 8.0.3 and 8.2.2

[nazari]

Hi! I have a 6-node cluster at 8.0.3 version and I was thinking to add 1 new cluster with 8.2.2 version (that's someone else working setup) Is there a problem to have some nodes in 8.0.3 and others in 8.2.2?

 

[Hannes Laimer]

Hey,

ideally nodes in a cluster should have the same version. But having them diverge, especially within the same major version, is no problem.

 

[nazari]

Hey,

ideally nodes in a cluster should have the same version. But having them diverge, especially within the same major version, is no problem.

Thanks, got your point, same major version like 8.x.x has no problem, but we should not have 7.x.x with 8.x.x

 

[Hannes Laimer]

Thanks, got your point, same major version like 8.x.x has no problem, but we should not have 7.x.x with 8.x.x

Also that is fine, the cluster itself is not very picky. The only thing are migrations, from an older to a newer major version is always supported, from a newer to older (so PVE 8 to a PVE 7 node) not officially, but in practice this will also work just fine, we just don't support it officially so there may be breaking changes between major versions that could complicate that. (But I can't think of something from the top of my head for 7 and 8 specifically)

tldr; having major versions at most 1 apart in the same cluster is supported, otherwise it wouldn't be possible to upgrade a cluster and having it stable during the update.