I didn't notice my GKE cluster is in Rapid channel. Until today I want to add Node Pool.
It shows Node version "1.17.5-gke.6" is unsupported.
https://cloud.google.com/kubernetes-engine/docs/release-notes-rapid#may_27_2020
My questions are:
I can't find anything about that in gcloud cli, official documents and stackoverflow.
When you create a cluster you have two options to choose from
A. Realease channel [Rapid/Regular/Stable]
B. Static version
1.How to downgrade GKE master version.
From documentation, it mentions that if you are in release channel [Rapid/Regular/Stable], downgrading is not possible.
With static version it is possible to downgrade with the following limitations.
2.How to update a GKE cluster to not use rapid channel.
This is not possible and it will give the following error
Migrating off of releaseChannel RAPID is not supported.More information can be also found here in regards to the migration between different release channels.