I have read article on https://podman.io/blogs/2019/09/26/podman-in-hpc.html. And I have built openmpi image with fedroa.30 and centos.7.9.2009. The hello_c runs successfully on fedroa.30 image. But hello_c failed to run on centos.7.9.2009. It hang when runs on centos.7.9.2009 image. I run it with -d, and it hang at "[rsyncdk2:2674797] [[58966,0],0] Releasing job data for [INVALID]". The following is the whole message. [rsync@rsyncdk2 ~] mpirun -d -v -host rsyncdk2:2 podman run --rm --env-host --userns=keep-id --network=host --pid=host --ipc=host 69fb54f4bb75 /home/hello_c [rsyncdk2:2674797] procdir: /tmp/ompi.rsyncdk2.1000/pid.2674797/0/0 [rsyncdk2:2674797] jobdir: /tmp/ompi.rsyncdk2.1000/pid.2674797/0 [rsyncdk2:2674797] top: /tmp/ompi.rsyncdk2.1000/pid.2674797 [rsyncdk2:2674797] top: /tmp/ompi.rsyncdk2.1000 [rsyncdk2:2674797] tmp: /tmp [rsyncdk2:2674797] sess_dir_cleanup: job session dir does not exist [rsyncdk2:2674797] sess_dir_cleanup: top session dir not empty - leaving [rsyncdk2:2674797] procdir: /tmp/ompi.rsyncdk2.1000/pid.2674797/0/0 [rsyncdk2:2674797] jobdir: /tmp/ompi.rsyncdk2.1000/pid.2674797/0 [rsyncdk2:2674797] top: /tmp/ompi.rsyncdk2.1000/pid.2674797 [rsyncdk2:2674797] top: /tmp/ompi.rsyncdk2.1000 [rsyncdk2:2674797] tmp: /tmp [rsyncdk2:2674797] [[58966,0],0] Releasing job data for [INVALID]