Просмотр кода страницы 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
[https://gist.github.com/peterhost/715255 взято тут...]