add note why docker "daemon" doesn't fork

[packages/docker.git] / docker.init

#!/bin/sh
#
# Create lightweight, portable, self-sufficient containers.
#
# chkconfig:	345 20 80
#
# description:	Docker is an open-source project to easily create lightweight, portable, \
#  self-sufficient containers from any application. The same container that a \
#  developer builds and tests on a laptop can run at scale, in production, on \
#  VMs, bare metal, OpenStack clusters, public clouds and more. \
# processname:	docker
# pidfile: /var/run/docker.pid
#

# Source function library
. /etc/rc.d/init.d/functions

# Get network config
. /etc/sysconfig/network

# Check that networking is up.
if is_yes "${NETWORKING}"; then
	if [ ! -f /var/lock/subsys/network -a "$1" != stop -a "$1" != status ]; then
		msg_network_down "Docker"
		exit 1
	fi
else
	exit 0
fi

# Get service config - may override defaults
[ -f /etc/sysconfig/docker ] && . /etc/sysconfig/docker

pidfile="/var/run/docker.pid"

start() {
	# Check if the service is already running?
	if [ -f /var/lock/subsys/docker ]; then
		msg_already_running "Docker"
		return
	fi

	# NOTE: docker daemon actually doesn't go to background, need to do that ourselves
	# https://github.com/docker/docker/issues/2758

	msg_starting "Docker"
	daemon --fork /usr/bin/docker daemon $OPTIONS
	RETVAL=$?
	[ $RETVAL -eq 0 ] && touch /var/lock/subsys/docker
}

stop() {
	if [ ! -f /var/lock/subsys/docker ]; then
		msg_not_running "Docker"
		return
	fi

	# Stop daemons.
	msg_stopping "Docker"
	killproc --pidfile $pidfile docker
	rm -f /var/lock/subsys/docker
}

condrestart() {
	if [ ! -f /var/lock/subsys/docker ]; then
		msg_not_running "Docker"
		RETVAL=$1
		return
	fi

	stop
	start
}

RETVAL=0
# See how we were called.
case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  restart)
	stop
	start
	;;
  try-restart)
	condrestart 0
	;;
  force-reload)
	condrestart 7
	;;
  status)
	status --pidfile $pidfile docker docker
	RETVAL=$?
	;;
  *)
	msg_usage "$0 {start|stop|restart|try-restart|force-reload|status}"
	exit 3
esac

exit $RETVAL