Adjust mqueue/msg_max for container under MacOS

[DavidEdell]

I'm trying to run software in a container that makes heavy usage of POSIX message queues. It fails to run from within the container, even if using --privileged. Using arguments such as --sysctl 'fs.mqueue.msg_max=256' result in an "OCI permission denied" error.

Interestingly, the application does run without issue from within the podman machine. ie: podman machine ssh and then running the application from the mounted folder. From within the podman machine I also get permission denied errors if I try altering /proc/sys/fs/mqueue/msg_max from there.

Any ideas? Thanks.

[Luap99]

see #19737

rootless users cannot adjust the limt, if you create the machine with podman machine init --rootful it should work.

[DavidEdell]

That did the trick, thanks.

For future reference:

• podman machine stop && podman machine rm
• podman machine init --rootful
• ... rebuild container
• podman run -it --rm --sysctl 'fs.mqueue.msg_max=256' -v ${PWD}:/shared myImage