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Kir Kolyshkin 0202c398ff runc exec: implement --cgroup

In some setups, multiple cgroups are used inside a container,
and sometime there is a need to execute a process in a particular
sub-cgroup (in case of cgroup v1, for a particular controller).
This is what this commit implements.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

2021-09-27 10:25:42 -07:00

2.8 KiB

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% runc-exec "8"

NAME

runc-exec - execute new process inside the container

SYNOPSIS

runc exec [option ...] container-id [--] command [arg ...]

runc exec [option ...] -p process.json container-id

OPTIONS

--console-socket path: Path to an AF_UNIX socket which will receive a file descriptor referencing the master end of the console's pseudoterminal. See docs/terminals.
--cwd path: Change to path in the container before executing the command.
--env|-e name=value: Set an environment variable name to value. Can be specified multiple times.
--tty|-t: Allocate a pseudo-TTY.
--user|-u uid[:gid]: Run the command as a user (and, optionally, group) specified by uid (and gid).
--additional-gids|-g gid: Add additional group IDs. Can be specified multiple times.
--process|-p process.json: Instead of specifying all the exec parameters directly on the command line, get them from a process.json, a JSON file containing the process specification as defined by the OCI runtime spec.
--detach|-d: Detach from the container's process.
--pid-file path: Specify the file to write the container process' PID to.
--process-label label: Set the asm process label for the process commonly used with selinux(7).
--apparmor profile: Set the apparmor(7) profile for the process.
--no-new-privs: Set the "no new privileges" value for the process.
--cap cap: Add a capability to the bounding set for the process. Can be specified multiple times.
--preserve-fds N: Pass N additional file descriptors to the container (stdio + $LISTEN_FDS + N in total). Default is 0.
--cgroup path | controller[,controller...]:path: Execute a process in a sub-cgroup. If the specified cgroup does not exist, an error is returned. Default is empty path, which means to use container's top level cgroup.; For cgroup v1 only, a particular controller (or multiple comma-separated controllers) can be specified, and the option can be used multiple times to set different paths for different controllers.; Note for cgroup v2, in case the process can't join the top level cgroup, runc exec fallback is to try joining the cgroup of container's init. This fallback can be disabled by using --cgroup /.

EXIT STATUS

Exits with a status of command (unless -d is used), or 255 if an error occurred.

EXAMPLES

If the container can run ps(1) command, the following will output a list of processes running in the container:

# runc exec <container-id> ps

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