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Changing systemd unit properties

In case runc uses systemd to set cgroup parameters for a container (i.e. --systemd-cgroup CLI flag is set), systemd creates a scope (a.k.a. transient unit) for the container, usually named like runc-$ID.scope.

The systemd properties of this unit (shown by systemctl show runc-$ID.scope after the container is started) can be modified by adding annotations to container's runtime spec (config.json). For example:

        "annotations": {
                "org.systemd.property.TimeoutStopUSec": "uint64 123456789",
                "org.systemd.property.CollectMode":"'inactive-or-failed'"
        },

The above will set the following properties:

  • TimeoutStopSec to 2 minutes and 3 seconds;
  • CollectMode to "inactive-or-failed".

The values must be in the gvariant format (for details, see gvariant documentation).

To find out which type systemd expects for a particular parameter, please consult systemd sources.