mount external volume on (read-only) /usr

[till]

Is it possible to (bind) mount a volume to a path on the read-only /usr partition?

As in, my k8s distro wants to write to /usr/libexec/k0s. All my attempts to mount anything there, result in mount failures all over the place when the node boots (and ran ignition). But I was curious if that is somehow possible.

[pothos]

A bind mount may be lost due to systemd-sysext images being (re)loaded. A solution that brings in a symlink through a systemd-sysext image is what we did here: https://github.com/flatcar/sysext-bakery/blob/7bbe7864bac89cbbeb2f71f206a794240bd63155/create_kubernetes_sysext.sh#L87

We should add this symlink to the generic image, I created an issue for that: #1193

[pothos]

I created a PR flatcar/scripts#1238

[till]

Is #1328 related?

[pothos]

Not really, the libexec symlink is part of the real /usr, not an overlay.