runc kill - kill sends the specified signal (default: SIGTERM) to the container's init process
runc kill [command options] <container-id> <signal>
Where "<container-id>" is the name for the instance of the container and "<signal>" is the signal to be sent to the init process.
--all, -a send the specified signal to all processes inside the container
For example, if the container id is "ubuntu01" the following will send a "KILL" signal to the init process of the "ubuntu01" container:
# runc kill ubuntu01 KILL