K8s version management

[matthieu-robin]

As a user or a Cozystack admin, I would like to be able to choose my K8s version ( specifically) independant of the Cozystack app version ( if possible)
And be sure of the version. Old version of Kubernetes needs to be still available.

[mattia-eleuteri]

This could extends to all the application present in the catalog.
I would like to choose my MariaDB version, I would like to choose my Reddis version, etc...
LTS supported versions should be available.

[kvaps]

I think we should consider using LTS versions by default.

But we need to develop a policy for supporting every specific version.

For example Kubernetes support only latest 3 versions
https://kubernetes.io/releases/

[matthieu-robin]

Could be cool if we can select the kind of upgrade: Node Cycling or Rolling Update for K8s cluster.

[samuelarogbonlo]

Looks like a cool issue. @matthieu-robin @kvaps @mattia-eleuteri Do you think I should do a small PR on this ?

Also, I will need the helm directory

[kvaps]

@samuelarogbonlo thank you,

The version should be specified in two places:

control-plane:

cozystack/packages/apps/kubernetes/templates/cluster.yaml

Line 127 in da1e705

version: 1.30.1

cozystack/packages/apps/kubernetes/templates/cluster.yaml

Line 237 in da1e705

version: v1.30.1

and workers, which is a bit more tricky, as we need to have separate docker image for every version:

cozystack/packages/apps/kubernetes/images/ubuntu-container-disk/Dockerfile

Line 39 in da1e705

&& guestfish --remote command "apt-get install -y kubelet kubeadm" \