A service init script for docker on openstack

openstack-docker

#!/bin/bash

### BEGIN INIT INFO
# INIT INFO
# Provides:          docker
# Required-Start:    networking
# Required-Stop:     networking
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: docker
# Description:       docker
### END INIT INFO

. /etc/init.d/functions

NAME=docker
PID_FILE="/var/run/${NAME}.pid"
DOCKER_UNIX_SOCKET=/var/run/docker.sock
DOCKER_GROUP=nova
SERVICE_TIMEOUT=60
DELAY=0

status_q() {
  status -p $PID_FILE $NAME > /dev/null
  return $?
}

start_app() {
   nohup /usr/bin/docker -b br100 -d >/var/log/docker.log 2>&1 </dev/null &
   local res=$?

   sleep 3
   chgrp $DOCKER_GROUP $DOCKER_UNIX_SOCKET
   chmod g+rw $DOCKER_UNIX_SOCKET
   
   return $res
}

check_config() {
   # Do not start if there is no config file.
   # [ ! -f "$CONFIG_FILE" ] && return 6
   return 0
}

start() {
        status_q; res=$?

  if [ $res -eq 3 ]; then
           echo -n $"$NAME starting..."

           start_app

           echo $! > $PID_FILE

           [ $DELAY -gt 0 ] && sleep $DELAY
           status_q; res=$?

           [ $res -eq 0 ] && success || failure
           echo
        elif [ $res -eq 0 ]; then
           success; echo "$NAME is already running"
        else
           failure; echo "$NAME is not running, res: $res"
        fi
        return $res
}


stop() {
        status_q; res=$?
        if [ $res -eq 3 ]; then
           success && echo "$NAME is not running"
        else
           killproc -p $PID_FILE; res=$?

           if [ $res -eq 0 ]; then
             rm -f PID_FILE
             success && echo "$NAME has been stopped"
           else
             failure && echo "$NAME cannot be stopped ($res)"
           fi
        fi

        return $res
}

case $1 in
  start)
           start
           exit $?
  ;;
  stop)
           stop
           exit $?
  ;;
  status)
     echo -n $"$NAME running..."
           status_q; res=$?

     [ $res -eq 0 ] && success || failure
     echo
           exit $res
  ;;
  restart)
           stop
           start
           exit $?
  ;;
  *)
    echo "Usage: $0 {start|stop|restart|status}"
    exit 2
    ;;
esac