Kubevirt prerequisites

[SanekP]

Kubevirt requires /dev/kvm to have 107 group and /var/lib/kubelet dir. Looks like there no parameters to configure this.

What is the best way to make these changes in Kairos cloud-config?
Currently I have added next section:

stages:
  fs:
  - name: "Kubevirt"
    commands:
    - groupadd -g 107 qemu
    - chgrp qemu /dev/kvm
    - rm -rf /var/lib/kubelet/*
    - mount -o bind /var/lib/k0s/kubelet /var/lib/kubelet

But I assume this is not the best way.

[jimmykarily]

My take is that if it works then it's fine. But you may also fix it by putting all but the mount command in the Dockerfile (if you are building a custom image). Also the mount command maybe also be a symlink? (not that I can think of any benefit in doing it with a symlink, just saying).

[SanekP]

I'm using pre built images as it simpler. On kubevirt's discussions it is recommended to use mount.
I'm considering https://docs.k0sproject.io/stable/configuration/?h=kubelet#kubelet-root-directory hope it helps eliminate future bumps.

Initial question was about stages, substages and stage modules. Is it better to use ensure_entities and files instead more familiar groupadd & chgrp? Can files module just change group? https://kairos.io/docs/reference/stage_modules/#files

[jimmykarily]

afaict, the dirs plugin sets the group on existing directories: https://github.com/mudler/yip/blob/10286328a0deb0e81b205dd52f303963e57cc559/pkg/plugins/dir.go#L39-L44

docs: https://kairos.io/docs/reference/stage_modules/#directories