Podman on Android

[bobmorane83]

Hi all,

I'm using Podman on Android on specific hardware. To make it work, I had to recompile the kernel with a few additional kernel flags. The minimal set I found in my case is the following:

CONFIG_POSIX_MQUEUE=y
CONFIG_PID_NS=y
CONFIG_CGROUP_PIDS=y

I understand the flags related to PID, but why is the mqueue flag required?
I couldn’t find any explanation, even in crun or conmon.
Can someone clarify this?

By the way, is there any way to bypass this requirement? Maybe through a Podman or crun option?

Thanks for your help,
BR

[bobmorane83]

Answering to my own question.

Podman create an config.json to be used by crun (or other) in the container image tree (.../userdata/).
In this file, in the mount section, a mounting point is added for /dev/mqueue.

    {
      "destination": "/dev/mqueue",
      "type": "mqueue",
      "source": "mqueue",
      "options": [
        "nosuid",
        "noexec",
        "nodev"
      ]
    },

This is done by default, even if --ipc=none is specified.

To bypass this problem use this simple podman option :

--mount type=bind,source=/dev/null,target=/dev/mqueue

I think that this mounting point should not be added to config.json when you use --ipc=none option.

BR.