docker stop

Usage:  docker stop [OPTIONS] CONTAINER [CONTAINER...]

Stop one or more running containers

Options:
      --help       Print usage
  -t, --time int   Seconds to wait for stop before killing it (default 10)

The main process inside the container will receive SIGTERM, and after a grace period, SIGKILL.

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https://docs.docker.com/v1.12/engine/reference/commandline/stop/