flatcar
[RFE] Create test coverage and documentation for Podman
Current situation
We have a supported Podman sysext extension but no test coverage for it nor documentation https://www.flatcar.org/docs/latest/provisioning/sysext/#flatcar-release-extensions-official
As part of our docs we should note that /etc/sub?id is created automatically for all users and groups created by ignition. You should not attempt to modify these files further using ignition as there is a conflict and you wind up with the first line of your sub?id files mangled as the core user is forced into, overwriting whatever is on the first line.
As part of our docs we should note that /etc/sub?id is created automatically for all users and groups created by ignition. You should not attempt to modify these files further using ignition as there is a conflict and you wind up with the first line of your sub?id files mangled as the core user is forced into, overwriting whatever is on the first line.
Before we can confirm this in docs though, we have to get /etc/sub[ug]id working. See: https://github.com/flatcar/Flatcar/issues/1733
Before getting into testing, @yufi16 will have a look to provide initial documentation. This is some ideas of elements to cover following elements:
- really small intro to Podman
- how to run Podman (with and without rootless mode (subuid / subgid settings)
- how to run Podman without Docker / Containerd
- a more advanced example to use ZFS + Podman: https://github.com/containers/storage/blob/main/docs/containers-storage.conf.5.md#storage-table
Note: Incus documentation can be used as inspiration (https://www.flatcar.org/docs/latest/container-runtimes/incus/), the goal here is not to rewrite Podman documentation.
