Daemon init script for node.js based app/server (DEBIAN/UBUNTU)

 #!/bin/sh
 # ------------------------------------------------------------------------------ 
 # SOME INFOS : fairly standard (debian) init script.
 #                 Note that node doesn't create a PID file (hence --make-pidfile) 
 #                 has to be run in the background (hence --background)
 #                 and NOT as root (hence --chuid)
 #
 # MORE INFOS :  INIT SCRIPT       http://www.debian.org/doc/debian-policy/ch-opersys.html#s-sysvinit
 #               INIT-INFO RULES   http://wiki.debian.org/LSBInitScripts
 #               INSTALL/REMOVE    http://www.debian-administration.org/articles/28
 # ------------------------------------------------------------------------------
 #                                                                              #
 #                     BEGIN <MODIFY TO REFLECT YOUR SETTINGS>                  #
 #                                                                              #
 #
 #  1) Don't forget to also modify the COMMENTED fields in the "### BEGIN INIT INFO"
 #     below (don't uncomment them) if you wish to install system-wide with update-rc.d
 #     eg: provides, Short-Description, Description
 #
 #  2) in case you have different node.js servers running, each init.d script should
 #     (obviously) have a UNIQUE BASE name so that PIDS do not conflict
 #     --> name them accordingly
 #     eg: node_static_server, node_express1, node_load_balancer.sh...
 #
 #  3) copy the renamed/modified script(s) to /etc/init.d
 #     chmod 755,
 #
 #  4) if you wish the Daemon to be lauched at boot / stopped at shutdown :
 #     INSTALL : update-rc.d scriptname defaults 
 #     (UNINSTALL : update-rc.d -f  scriptname remove)
 #
 #  5)  based on : Debian /etc/init.d/skeleton
 #      modified by : Peter Host (www.oghme.com)
 # ______________________________________________________________________________ 
 ### BEGIN INIT INFO
 # Provides:          node_debian_init
 # Required-Start:    $remote_fs $named $syslog
 # Required-Stop:     $remote_fs $named $syslog
 # Default-Start:     2 3 4 5
 # Default-Stop:      0 1 6
 # Short-Description: DEBIAN initscript for node.js servers/apps
 # Description:       ex : proxy server is a node.js http server listening on
 #                    port 8080 (relayed from 80 by iptables). It balances
 #                    http requests between the main nodejs server 
 #                    (nodejs.mydomain.com:8000), the static file-server 
 #                    (static.mydomain.com) and the legacy apache server
 #                    (apache.mydomain.com) and possibly other servers
 #                    place this file in /etc/init.d.
 ### END INIT INFO
 
 # Author: My Name <myname@domain.tld>
 #
 # Please remove the "Author" lines above and replace them
 # with your own name if you copy and modify this script.
 # ______________________________________________________________________________ 
 #
 # PATH should only include /usr/* if it runs after the mountnfs.sh script
 PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin # modify if you need
 
 DAEMON_ARGS="/path/to/app.js"               # path to your node.js server/app
 					      # NB: don't use ~/ in path
 
 DESC="node.js http server"                  # whatever fancy description you like
 
 NODEUSER=myuser:mygroup                     # USER who OWNS the daemon process (no matter whoever runs the init script)
 					      # user:group (if no group is specified, the primary GID for that user is used)
 
 LOCAL_VAR_RUN=/usr/local/var/run            # in case the init script is run by non-root user, you need to
 					      # indicate a directory writeable by $NODEUSER to store the PID file
 					      # NB : 1) /usr/local/var/run does not exist by DEFAULT. Either create it
 					      #      or choose one of your own liking.
 					      #      2) node, npm,... are best NOT installed/run as ROOT.
 					      #         (see here: https://github.com/isaacs/npm/blob/master/README.md)
 
 NAME=node                                   # name of the node.js executable
 DAEMON=/usr/local/bin/$NAME                 # this SHOULD POINT TO where your node executable is
 #
 #                                                                              #
 #                   END </MODIFY TO REFLECT YOUR SETTINGS>                     #
 #                (Nothing else to modify from this point on...)                #
 # ------------------------------------------------------------------------------ 
 
 
 
 
 
 # Do NOT "set -e"
 
 [ $UID -eq "0" ] && LOCAL_VAR_RUN=/var/run # in case this script is run by root, override user setting
 THIS_ARG=$0
 INIT_SCRIPT_NAME=`basename $THIS_ARG`
 [ -h $THIS_ARG ] && INIT_SCRIPT_NAME=`basename $(readlink $THIS_ARG)` # in case of symlink
 INIT_SCRIPT_NAME_NOEXT=${INIT_SCRIPT_NAME%.*}                            
 PIDFILE="$LOCAL_VAR_RUN/$INIT_SCRIPT_NAME_NOEXT.pid"
 SCRIPTNAME=/etc/init.d/$INIT_SCRIPT_NAME
 
 # Exit if the package is not installed
 [ -x "$DAEMON" ] ||  { echo "can't find Node.js ($DAEMON)"  >&2; exit 0; }
 
 # Exit if the 'run' folder is not present
 [ -d "$LOCAL_VAR_RUN" ] || { echo "Directory $LOCAL_VAR_RUN does not exist. Modify the '$INIT_SCRIPT_NAME_NOEXT' init.d script ($THIS_ARG) accordingly" >&2; exit 0; }
 
 # Read configuration variable file if it is present
 [ -r /etc/default/$INIT_SCRIPT_NAME ] && . /etc/default/$INIT_SCRIPT_NAME
 
 # Load the VERBOSE setting and other rcS variables
 . /lib/init/vars.sh
 
 # Define LSB log_* functions.
 # Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
 . /lib/lsb/init-functions
 
 # uncomment to override system setting
 # VERBOSE=yes
 
 #
 # 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
 	  start-stop-daemon --start --quiet --pidfile $PIDFILE --chuid $NODEUSER --background --exec $DAEMON --test > /dev/null \
 		  || { [ "$VERBOSE" != no ] && log_daemon_msg  "  --->  Daemon already running $DESC" "$INIT_SCRIPT_NAME_NOEXT"; return 1; }
 	  start-stop-daemon --start --quiet --chuid $NODEUSER --make-pidfile --pidfile $PIDFILE --background --exec $DAEMON -- \
 		  $DAEMON_ARGS \
 		  || { [ "$VERBOSE" != no ] && log_daemon_msg  "  --->  could not be start $DESC" "$INIT_SCRIPT_NAME_NOEXT"; return 2; }
 	  # Add code here, if necessary, that waits for the process to be ready
 	  # to handle requests from services started subsequently which depend
 	  # on this one.  As a last resort, sleep for some time.
 	  [ "$VERBOSE" != no ] && log_daemon_msg  "  --->  started $DESC" "$INIT_SCRIPT_NAME_NOEXT"
 }
 
 #
 # 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/30/KILL/5 --pidfile $PIDFILE  --chuid $NODEUSER --name $DAEMON
 	  RETVAL="$?"
 	  #[ "$VERBOSE" != no ] && [ "$RETVAL" = 1 ] && log_daemon_msg  "  --->  SIGKILL failed => hardkill $DESC" "$INIT_SCRIPT_NAME_NOEXT"
 	  [ "$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=0/3/KILL/5 --pidfile $PIDFILE  --chuid $NODEUSER --exec $DAEMON -- $DAEMON_ARGS
 	  [ "$?" = 2 ] && return 2
 	  # Many daemons don't delete their pidfiles when they exit.
 	  rm -f $PIDFILE
   [ "$VERBOSE" != no ] && [ "$RETVAL" = 1 ] && log_daemon_msg "  --->  $DESC not running" "$INIT_SCRIPT_NAME_NOEXT"
   [ "$VERBOSE" != no -a "$RETVAL" = 0 ] && log_daemon_msg "  --->  $DESC stopped" "$INIT_SCRIPT_NAME_NOEXT"
 	  return "$RETVAL"
 }
 
 #
 # Function that sends a SIGHUP to the daemon/service
 #
 do_reload() {
 	  #
 	  # If the daemon can reload its configuration without
 	  # restarting (for example, when it is sent a SIGHUP),
 	  # then implement that here.
 	  #
 	  start-stop-daemon --stop --quiet --signal 1 --pidfile $PIDFILE  --chuid $NODEUSER --name $NAME
 	  return 0
 }
 
 #
 # Function that returns the daemon 
 #
 do_status() {
   #
   # http://refspecs.freestandards.org/LSB_3.1.1/LSB-Core-generic/LSB-Core-generic/iniscrptact.html
   # 0 program is running or service is OK
   # 1 program is dead and /var/run pid file exists
   # (2 program is dead and /var/lock lock file exists) (not used here)
   # 3 program is not running
   # 4 program or service status is unknown
   RUNNING=$(running)
   
   # $PIDFILE corresponds to a live $NAME process
   ispidactive=$(pidof $NAME | grep `cat $PIDFILE 2>&1` >/dev/null 2>&1)
   ISPIDACTIVE=$?
 
   if [ -n "$RUNNING" ]; then
     if [ $ISPIDACTIVE ]; then 
 	log_success_msg "$INIT_SCRIPT_NAME_NOEXT (launched by $USER) (--chuid $NODEUSER) is running"
 	exit 0      
     fi
   else
     if [ -f $PIDFILE ]; then
 	log_success_msg "$INIT_SCRIPT_NAME_NOEXT (launched by $USER) (--chuid $NODEUSER) is not running, phantom pidfile $PIDFILE"
 	exit 1
     else
 	log_success_msg "no instance launched by $USER, of $INIT_SCRIPT_NAME_NOEXT (--chuid $NODEUSER) found"
 	exit 3
     fi
   fi
   
 }
 
 running() {
   RUNSTAT=$(start-stop-daemon --start --quiet --pidfile $PIDFILE --chuid $NODEUSER --background --exec $DAEMON --test > /dev/null)
   if [ "$?" = 1 ]; then
     echo y
   fi
   
 }
 
 
 case "$1" in
   start)
 	  [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$INIT_SCRIPT_NAME_NOEXT"
 	  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 $DESC" "$INIT_SCRIPT_NAME_NOEXT"
 	  do_stop
 	  case "$?" in
 		  0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
 		  2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
 	  esac
 	  ;;
   #reload|force-reload)
 	  #
 	  # If do_reload() is not implemented then leave this commented out
 	  # and leave 'force-reload' as an alias for 'restart'.
 	  #
 	  #log_daemon_msg "Reloading $DESC" "$NAME"
 	  #do_reload
 	  #log_end_msg $?
 	  #;;
   restart|force-reload)
 	  #
 	  # If the "reload" option is implemented then remove the
 	  # 'force-reload' alias
 	  #
 	  log_daemon_msg "Restarting $DESC" "$INIT_SCRIPT_NAME_NOEXT"
 	  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)
     do_status
   ;;
   *)
 	  #echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
 	  echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
 	  exit 3
 	  ;;
 esac
 
 exit 0

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