Template file for creating linux services out of executables using the start-stop-daemon

start-stop-daemon-template

#!/bin/bash
### BEGIN INIT INFO
# Provides:          <service name>
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: <service description>
### END INIT INFO

#################################################################################
# 
# start-stop-daemon template for creating service scripts out of executables
# 
# Most of the installations can be achived by changing the variables below.
#
# This template is meant to be used freely. 
# This template derives from a common template that is found on the web. 
# Unfornately I could not find the original source to give the proper credits
#
# source: https://gist.github.com/bcap/5397674
# Feel free to contribute!
#################################################################################


#################################################################################
# Fill/change the following vars
#################################################################################

PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="<service description>"              # String describing the service
NAME="<service name>"                     # Name of the service, will be used in another vars
DAEMON="/usr/bin/service-executable"      # Path to the service executable, e.g. /usr/bin/java
DAEMON_ARGS="-a -b -some-arg=some-value"  # Arguments passed to the service startup

WORK_DIR="/var/lib/${NAME}"               # Working directory where the service will be started, defaults to /var/lib/${NAME}
USER=$NAME                                # User that will spawn the process, defaults to the service name
GROUP=$NAME                               # Group that will spawn the process, defaults to the service name
PIDFILE=/var/run/${NAME}.pid              # Pid file location, defaults to /var/run/${NAME}.pid
SCRIPTNAME=/etc/init.d/$NAME              # Location of this init script
LOG_PATH=/var/log/$NAME                   # Standard output and Standard error will be outputted here

START_STOP_DAEMON_OPTIONS="--chuid=$USER:$GROUP --background --chdir=$WORK_DIR"

#################################################################################
# Change the code below if needed
#################################################################################

# Exit if the package is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

#
# 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_STOP_DAEMON_OPTIONS --start --pidfile $PIDFILE --exec $DAEMON --test >> ${LOG_PATH}/${NAME}.out 2>> ${LOG_PATH}/${NAME}.err || return 1
  start-stop-daemon $START_STOP_DAEMON_OPTIONS --start --pidfile $PIDFILE --exec $DAEMON -- $DAEMON_ARGS >> ${LOG_PATH}/${NAME}.out 2>> ${LOG_PATH}/${NAME}.err || 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.
}

#
# 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 $PIDFILE
  RETVAL="$?"
  [ "$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.
  rm -f $PIDFILE
  return "$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 --signal 1 --quiet --pidfile $PIDFILE --name $NAME
  return 0
}

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)   [ "$VERBOSE" != no ] && log_end_msg 1 ;;
    esac
  ;;
  status)
    status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
  ;;
  #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 $DESC" "$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
  ;;
  *)
  #echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
  echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
  exit 3
  ;;
esac

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