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init.d script to start and stop an app

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#! /bin/sh

### BEGIN INIT INFO
# Provides:          <my_app> application instance
# Required-Start:    $all
# Required-Stop:     $all
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts instance of <my_app> app
# Description:       starts instance of <my app> app using start-stop-daemon
### END INIT INFO

############### EDIT ME ##################
# path to workingenv install if any
PYTHONPATH=<path to pylons workingenv>/lib/python2.4

# path to app
APP_PATH=<path to my_app>

# path to paster bin
DAEMON=<path to pylons workingenv>/bin/paster

# startup args
DAEMON_OPTS=" serve --log-file <my logfile> --server-name=main production.ini"

# script name
NAME=<my_rc_script.sh>

# app name
DESC=<my_app>

# pylons user
RUN_AS=<user to switch to after startup>

PID_FILE=/var/run/paster.pid

############### END EDIT ME ##################

test -x $DAEMON || exit 0

set -e

case "$1" in
  start)
        echo -n "Starting $DESC: "
        start-stop-daemon -d $APP_PATH -c $RUN_AS --start --background --pidfile $PID_FILE  --make-pidfile --exec $DAEMON -- $DAEMON_OPTS
        echo "$NAME."
        ;;
  stop)
        echo -n "Stopping $DESC: "
        start-stop-daemon --stop --pidfile $PID_FILE
        echo "$NAME."
        ;;

  restart|force-reload)
        echo -n "Restarting $DESC: "
        start-stop-daemon --stop --pidfile $PID_FILE
        sleep 1
        start-stop-daemon -d $APP_PATH -c $RUN_AS --start --background --pidfile $PID_FILE  --make-pidfile --exec $DAEMON -- $DAEMON_OPTS
        echo "$NAME."
        ;;
  *)
        N=/etc/init.d/$NAME
        echo "Usage: $N {start|stop|restart|force-reload}" >&2
        exit 1
        ;;
esac

exit 0

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Comments (4)

 

  1. Nov 20, 2008

    Rick Noelle says:

    Note that start-stop-daemon is a Debian command so this script will not work as ...

    Note that start-stop-daemon is a Debian command so this script will not work as is on a typical Fedora or RedHat server.

    1. Nov 21, 2008

      Rick Noelle says:

      I have added a Red Hat version to the Cookbook.

      I have added a Red Hat version to the Cookbook.

  2. Nov 13, 2009

    KLEIN Stéphane says:

    Warning ! In this script PYTHONPATH isn't used !

    Warning ! In this script PYTHONPATH isn't used !

  3. Jul 04, 2010

    Geoff Clements says:

    I've just created an alternative initscript (for Debian again, sorry!). The adva...

    I've just created an alternative initscript (for Debian again, sorry!). The advantage of this one is that it starts multiple servers. There are two files:

    /etc/init.d/pylons:

    /etc/init.d/pylons

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    #! /bin/bash
### BEGIN INIT INFO
# Provides:          pylons
# Required-Start:    $remote_fs
# Required-Stop:     $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Control Pylons Servers
# Description:       Starts and stops Pylons servers as defined in
#                    /etc/default/pylons.
### END INIT INFO

# Author: Geoff Clements <geoff@electron.me.uk>
#

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="Pylons Servers"

# Exit if the default file does not exist
[ -f "/etc/default/pylons" ] || exit 0

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

# 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

#
# Function that starts the daemon/service
#
do_start()
{
    [ x${START_PYLONS} != xYES ] && return 0
    serv_no=0
    for server in ${SERVERS[@]}; do
        if test -r ${server}; then
            PIDFILE=/var/run/pylons_$((serv_no++)).pid
            DAEMON=${PYENV}/bin/paster
            DAEMON_OPTS="serve ${server}" 
            [ -f ${PIDFILE} ] && continue
            log_daemon_msg "Starting ${DAEMON} ${DAEMON_OPTS}"
            start-stop-daemon --start --quiet --background --make-pidfile \
                --chuid ${PYLONS_UG} --pidfile $PIDFILE \
                --exec ${DAEMON} -- ${DAEMON_OPTS}
            log_end_msg $?
        fi
    done
}

#
# Function that stops the daemon/service
#
do_stop()
{
    RETVAL=0
    for PIDFILE in /var/run/pylons_*.pid; do
        start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 \
            --pidfile $PIDFILE
        [ $? -gt ${RETVAL} ] && RETVAL=$?
        rm -f $PIDFILE
    done
    log_end_msg ${RETVAL}
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
    RETVAL=0
    for PIDFILE in /var/run/pylons_*.pid; do
	start-stop-daemon --stop --signal 1 --quiet --pidfile $PIDFILE
        [ $? -gt ${RETVAL} ] && RETVAL=$?
    done
    log_end_msg ${RETVAL}
}

case "$1" in
  start)
	log_daemon_msg "Starting $DESC"; echo "..."
	do_start
	;;
  stop)
	log_daemon_msg "Stopping $DESC"
	do_stop
	;;
  reload|force-reload)
	log_daemon_msg "Reloading $DESC"
	do_reload
	;;
  restart)
	log_daemon_msg "Restarting $DESC"; echo
	do_stop
	sleep 5
        do_start
        ;;
  *)
	echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
	#echo "Usage: $SCRIPTNAME {start|stop|restart|force-reload}" >&2
	exit 3
	;;
esac

    /etc/default/pylons

    /etc/default/pylons

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    # Author: Geoff Clements <geoff@electron.me.uk>
#

# This is the control file for running Pylons servers. It is read by
# /etc/init.d/pylons
#

# The big red button, set it to any value other than "YES" to
# prevent all Pylons servers from starting
START_PYLONS=YES

# Location of the virtual environment
PYENV=/var/pyenv

# Which python is in the virtual environment
PYTHON=python2.5

# Set which user and group the servers should run as
PYLONS_UG='www-data:www-data'

# Definition of the servers to start
# To start a server you must assign it to: SERVERS[0], SERVERS[1], 
# SERVERS[2] ... etc.
# The servers are started in numerical order.
# The value to use should be the full path to the ini file, normally
# production.ini, feel free to use the pre-defined variables above.
# In order to prevent any individual server from starting just put an
# underscore at the start of the server path, see SERVER[1] example
# below.
# WARNING:
# Do not make any adjustment other than adding new servers to this list
# whilst the servers are running. Please stop all servers before making 
# a change.
SERVERS[0]=${PYENV}/lib/${PYTHON}/site-packages/placeholder/production.ini
SERVERS[1]=_${PYENV}/lib/${PYTHON}/site-packages/not_real/production.ini

    These files are available from ftp://ftp.electron.me.uk/pylons_sysv.tar.gz


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