How to list rootless containers of ALL the users?

Is there a command to show the containers and images present in the server? That means for root and all the users (rootless containers)?

su -
podman container ps --all

shows only root's containers.

I expected root to be able to see all the other containers.

Solution

I don't think there is any command to list all containers for all users, but you could list all containers for an arbitrary user:

sudo systemd-run --machine=username@ --quiet --user --collect --pipe --wait podman container ps --all

(a recent version of systemd is needed for the command above).

You could also use machinectl

$ sudo -i
# machinectl shell username@
Connected to the local host. Press ^] three times within 1s to exit session.
$ podman container ps --all

Both executables belong to the systemd project.

$ rpm -qf /usr/bin/systemd-run
systemd-249.9-1.fc35.x86_64
$ rpm -qf /usr/bin/machinectl 
systemd-container-249.9-1.fc35.x86_64
$ cat /etc/fedora-release 
Fedora release 35 (Thirty Five)

As to why not use su see

Quote Why can't I run rootless Podman containers when I log into a user via sudo or su? from https://www.redhat.com/sysadmin/sudo-rootless-podman