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I think you can modify /oem/90_custom.yaml (or it's v1.1.1 equivalent) and find the part that writes out /etc/rancher/rke2/config.yaml.d/90-harvester-server.yaml and edit the kubelet-args section to add an arg to enable the feature gate. I am doing something similar to enable CPU Manager. kubelet-arg: - "max-pods=200" - "cpu-manager-policy=static" - "feature-gates=CPUManager=true"

will simply writing to file /etc/rancher/rke2/config.yaml.d/90-harvester-server.yaml will update the k8s cluster or do I need to restart any server or pod ?

I don't know if you can update that file and restart kubelet manually or not. I always applied the setting via a reboot to make sure the config file change worked and since I was in a test environment.

Let me try with the first approach because reboot in prod/staging won't be a great solution for us