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

1. !/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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