Init Script for Graphite/Gunicorn

gistfile1.sh

#! /bin/sh
### BEGIN INIT INFO
# Provides:          gunicorn-graphite
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Should-Start:      $nginx
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: gunicorn + nginx ubuntu init script
# Description:       gunicorn + nginx ubuntu init script
### END INIT INFO

# Author: Jeremy Chalmer
# Original Author: Nicolas Kuttler <hidden>
# http://drumcoder.co.uk/blog/2011/aug/26/installing-graphite-debian/
#
# This init script was written for Ubuntu 11.10 using start-stop-daemon.
# 
# Note: This init script does *NOT* use virtualenv.
#
# Enable with update-rc.d gunicorn-graphite


# Source init-functions:
#source /lib/lsb/init-functions
. /lib/lsb/init-functions

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin


# ----- gunicorn_django configuration -----
export PYTHONPATH=/opt/graphite/webapp
PROJECT=/opt/graphite/webapp/graphite
PORT=8000
LOGDIR=/var/log/gunicorn		# Make sure this directory is writeable by USER!
IP=localhost
WORKERS=1
USER=www-data
GROUP=www-data
# ----- end gunicorn_django configuration -----

# Name of executable daemon
NAME=gunicorn_django
DESC=$NAME
LOGFILE="$LOGDIR/$NAME.log"

# Path to Executable
DAEMON=$(which $NAME)

PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Lay out the arguments for gunicorn using the configuration from above.
GUNICORN_ARGS="	--user=$USER \
		--group=$GROUP \
		--daemon \
		--workers=$WORKERS \
		--bind=$IP:$PORT \
		--pid=$PIDFILE \
		--name=$NAME \
		--log-file=$LOGFILE \
		--log-level=info \
		-D settings.py"

# Exit if the package is not installed
if [ ! -x "$DAEMON" ]; then {
    echo "Couldn't find $DAEMON or not executable"
    exit 99
}
fi

# Load the VERBOSE setting and other rcS variables
[ -f /etc/default/rcS ] && . /etc/default/rcS

#
# Function that starts the daemon/service
#
do_start()
{
    # Return
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    
		# Test to see if the daemon is already running - return 1 if it is. 
    start-stop-daemon --start --pidfile $PIDFILE --make-pidfile --chdir $PROJECT \
        --exec $DAEMON --background --test -- $GUNICORN_ARGS > /dev/null || return 1
		
		# Start the daemon for real, return 2 if failed
    start-stop-daemon --start --pidfile $PIDFILE --make-pidfile --chdir $PROJECT \
        --exec $DAEMON -- $GUNICORN_ARGS || return 2
}

#
# Function that relaods the daemon's settings by sending SIGHUP
#
do_reload()
{
    start-stop-daemon --stop --quiet --pidfile $PIDDILE --exec $DAEMON --signal 1
}

#
# Function that stops the daemon/service
#
do_stop()
{
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    start-stop-daemon --stop --quiet --retry=TERM/10/KILL/5 --pidfile $PIDFILE --exec $DAEMON
    RETVAL="$?"
    [ "$RETVAL" = 2 ] && return 2

    # Wait for children to finish too if this is a daemon that forks
    # and if the daemon is only ever run from this initscript.
    # If the above conditions are not satisfied then add some other code
    # that waits for the process to drop all resources that could be
    # needed by services started subsequently.  A last resort is to
    # sleep for some time.

    start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
    [ "$?" = 2 ] && return 2

    # Many daemons don't delete their pidfiles when they exit.
		if [ -e "$PIDFILE" ]; then {
    	rm -f $PIDFILE
    }
		fi
		
    return "$RETVAL"
}


# Display / Parse Init Options
case "$1" in
  start)
 	 [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
	  do_start
	  case "$?" in
	    0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
	    2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	  esac
  ;;
  stop)
 	 [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
	  do_stop
	  case "$?" in
	    0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
	    2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	  esac
  ;;
  restart)
  	log_daemon_msg "Restarting $DESC" "$NAME"
		do_stop
		  case "$?" in
		    0|1)
		    do_start
		    case "$?" in
		      0) log_end_msg 0 ;;
		      1) log_end_msg 1 ;; # Old process is still running
		      *) log_end_msg 1 ;; # Failed to start
		    esac
	   ;;
    *)
      # Failed to stop
    log_end_msg 1
    ;;
  esac
  ;;
  reload)
  	log_daemon_msg "Reloading $DESC" "$NAME"
	  do_reload
	  case "$?" in
	    0) log_end_msg 0 ;;
	    *) log_end_msg 1 ;;
	  esac
  ;;
  status)
      if [ -s $PIDFILE ]; then
          pid=`cat $PIDFILE`
          kill -0 $pid >/dev/null 2>&1
          if [ "$?" = "0" ]; then
              echo "$NAME is running: pid $pid."
              RETVAL=0
          else
              echo "Couldn't find pid $pid for $NAME."
              RETVAL=1
          fi
      else
          echo "$NAME is stopped (no pid file)."
          RETVAL=1
      fi
  ;;
  *)
  echo "Usage: $SCRIPTNAME {start|stop|status|restart|reload}" >&2
  exit 3
  ;;
esac
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