#148 (comment) lists the docker CLI allowed values which include an empty string:

docker run --help | grep cgroup
      --cgroupns string                Cgroup namespace to use (host|private)
                                       'host':    Run the container in the Docker host's cgroup namespace
                                       'private': Run the container in its own private cgroup namespace
                                       '':        Use the cgroup namespace as configured by the
                                                  default-cgroupns-mode option on the daemon (default)

Would this be also needed to be carried over to the compose world?

@thediveo cgroup: "" would probably better be defined in a compose file by not setting cgroup attribute. Then the actual behavior would be left to the container runtime (out of the scope of the compose spec) which is indeed default-cgroupns-mode option on docked, but could be a different choice with alternative runtimes.

+1

has this been released? Which version of compose has it? I don't see it reflected in https://docs.docker.com/compose/compose-file/

Don't know the exact version but as of "Docker compose version v2.18.1" it is available. I'm now using it to slightly simplify my deployments; see here: https://github.com/thediveo/lxkns/blob/develop/README.md#quick-start

This has also finally landed in the documentation: https://docs.docker.com/compose/compose-file/05-services/#cgroup