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PID Namespace

When --pidns (since v0.5.0) is specified, RootlessKit executes the child process in a new PID namespace. The RootlessKit child process becomes the init (PID=1). When RootlessKit terminates, all the processes in the namespace are killed with SIGKILL.

See also pid_namespaces(7).

Cgroup Namespace

When --cgroupns (since v0.10.0) is specified, RootlessKit executes the child process in a new cgroup namespace.

Cgroup2 evacuation

Cgroup2 evacuation is supported since v0.13.0.

e.g., systemd-run -p Delegate=yes --user -t rootlesskit --cgroupns --pidns --evacuate-cgroup2=evac --net=slirp4netns bash

When the current process belongs to /foo group (visible under /sys/fs/cgroup/foo) and evacuation group name is like bar,

  • All processes in the /foo group are moved to /foo/bar group, by writing PIDs into /sys/fs/cgroup/foo/bar/cgroup.procs
  • As many controllers as possible are enabled for /foo/* groups, by writing /sys/fs/cgroup/foo/cgroup.subtree_control