Flatcar fails to start due to missing /run/kubeadm/configure-kube-proxy.sh

[gabriel-samfira]

The resource seems to be written to /run/kubeadm/configure-kube-proxy.sh via the ignition files directive. This happens on boot in the initrd, however, the /run folder gets recreated once the initrd pivots to the real system and executes systemd. Thus, the file will be missing in the fully booted system and kubeadm fails.

If we really need to have that file in /run, then we need to write it via a systemd unit file on Flatcar.