graphite-api init.d script debian

init.d_graphite-api.sh

#! /bin/sh
### BEGIN INIT INFO
# Provides:          graphite-api
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: graphite api init script
# Description:       An init script for Graphite's API daemon.
### END INIT INFO
 
#
# Enable with update-rc.d carbon-cache defaults
 
 
# 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
 

# Name of executable daemon
NAME=graphite-api
DESC=graphite-api
 
 
# Path to Executable
DAEMON=`which gunicorn`

 
# NOTE: This is a hard-coded PID file, based on carbon-cache.py. If you have more the one carbon-cache
#       instance running on this machine, you'll need to figure out a better way to calculate the PID file.
PIDFILE=/var/run/graphite-api.pid
 
SCRIPTNAME=/etc/init.d/$NAME
 
# Exit if the package is not installed
if [ ! -x "$DAEMON" ]; then {
    echo "Couldn't find $DAEMON or not executable"
    exit 99
}
fi

USER="www-data"
PORT=8000
CMD="-b 0.0.0.0:$PORT -w 2 --log-level debug graphite_api.app:app >>/var/log/graphite/graphite-api.log 2>&1"
 
# 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 --chuid $USER \
        --exec $DAEMON --test -- start > /dev/null || return 1

    start-stop-daemon --start --background --quiet --chuid $USER \
                    --pidfile "$PIDFILE" --make-pidfile \
                    --startas /bin/bash -- -c "exec $DAEMON $CMD"
}
 
#
# 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
    log_daemon_msg "Stopping $DESC" "$NAME"
    start-stop-daemon --stop --signal 2 --retry 5 --quiet --pidfile $PIDFILE
    RETVAL="$?"
    [ "$RETVAL" = 2 ] && return 2
 
                # Delete the exisitng PID file
    if [ -e "$PIDFILE" ]; then {
        rm $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
  ;;
  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|restart|status}" >&2
  exit 3
  ;;
esac
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