Dear All,

We set up scrun (slurm 23.11.5) integrated with rootless podman, referring to the official documentation. https://slurm.schedmd.com/containers.html#podman-scrun https://slurm.schedmd.com/scrun.html#SECTION_Example-%3CB%3Escrun.lua%3C/B%3...

However, runc/crun prints the error message and fails to run the container. Looking at the error message from runc, it seems that there is a problem with the GID mapping configuration.

- runc [hoge@slm-master hoge]$ podman run centos echo "Hello World" time="2024-04-03T02:39:36Z" level=error msg="runc run failed: cannot specify gid=5 mount option for rootless container: User namespaces enabled, but no group mapping found." srun: error: slm-worker: task 0: Exited with exit code 1

- crun [hoge@slm-master hoge]$ podman run centos echo "Hello World" srun: error: slm-worker: task 0: Exited with exit code 1 mount `devpts` to `dev/pts`: Invalid argument

When we removed the process of linux.gidMappings configuration from scrun.lua, runc failed to run the container due to the different error, but crun succeeded.

- scrun.lua (The process of linux.gidMappings configuration) ... snip ... -- Provide default group map as root if one not provided -- mappings fail with build??? if (true or config["linux"]["gidMappings"] == nil) then config["linux"]["gidMappings"] = {{containerID=process_group_id, hostID=math.floor(group_id), size=1}} end ... snip ...

- runc [hoge@slm-master hoge]$ podman run centos echo "Hello World" time="2024-04-03T02:37:18Z" level=error msg="runc run failed: User namespaces enabled, but no gid mappings found." srun: error: slm-worker: task 0: Exited with exit code 1

- crun [hoge@slm-master hoge]$ podman run centos echo "Hello World" Hello World

Therefore, we would like to know the following two questions. - The reason for the failure to run the container - Required or recommended configuration to run the container

Best Regards, Toshiki Sonoda