Can a k3s cluster contain master nodes with different k3s version?

[batulziiy]

Hi all,

I know it is recommended to have the same version of k3s nodes in cluster, however I got a situation where I need to add a new node with different version of k3s (to be more specific v1.31.4+k3s1) to the existing cluster where master nodes have the version v1.26.3+k3s1.
Do you have any idea if it can lead to a problem?
For now I have a cluster with 5 master nodes with version : v1.26.3+k3s1
The version that I want to add a new node : v1.31.4+k3s1
That node with late version will be removed after some time once I finished checking something. Do you guys think it's safe to try?

Thanks all

[dereknola]

We support the standard K8s skew policy https://kubernetes.io/releases/version-skew-policy/, which means 1 minor different between servers. So you cannot mix 1.26 and 1.31 servers. At most, you can mix 1.26 and 1.27 servers.

[batulziiy]

I see, thanks for the answer, now it's clear to me.