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Ubuntu/webserver/nginx/init

From MattWiki
noteThis Page was written with Ubuntu 12.04 LTS in mind, and may not work correctly with other versions or distributions.

You may also download this init file in gzip format. 

#! /bin/sh
### BEGIN INIT INFO
# Provides:          nginx
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: nginx init.d dash script for Ubuntu <=9.10.
# Description:       nginx init.d dash script for Ubuntu <=9.10.
### END INIT INFO
#------------------------------------------------------------------------------
# nginx - this Debian Almquist shell (dash) script, starts and stops the nginx 
#         daemon for ubuntu 9.10 and lesser version numbered releases.
#
# description:  Nginx is an HTTP(S) server, HTTP(S) reverse \
#               proxy and IMAP/POP3 proxy server.  This \
#		script will manage the initiation of the \
#		server and it's process state.
#
# processname: nginx
# config:      /usr/local/nginx/conf/nginx.conf
# pidfile:     /acronymlabs/server/nginx.pid
# Provides:    nginx
#
# Author:  Jason Giedymin
#          <jason.giedymin AT gmail.com>.
#
# Version: 2.0 02-NOV-2009 jason.giedymin AT gmail.com
# Notes: nginx init.d dash script for Ubuntu <=9.10.
# 
# This script's project home is:
# 	http://code.google.com/p/nginx-init-ubuntu/
#
#------------------------------------------------------------------------------
#                               MIT X11 License
#------------------------------------------------------------------------------
#
# Copyright (c) 2009 Jason Giedymin, http://Amuxbit.com formerly
#				     http://AcronymLabs.com
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#------------------------------------------------------------------------------
 
#------------------------------------------------------------------------------
#                               Functions
#------------------------------------------------------------------------------
. /lib/lsb/init-functions
 
#------------------------------------------------------------------------------
#                               Consts
#------------------------------------------------------------------------------
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
DAEMON=/usr/local/sbin/nginx
 
PS="nginx"
PIDNAME="nginx"				#lets you do $PS-slave
PIDFILE=$PIDNAME.pid                    #pid file
PIDSPATH=/var/run
 
DESCRIPTION="Nginx Server..."
 
RUNAS=root                              #user to run as
 
SCRIPT_OK=0                             #ala error codes
SCRIPT_ERROR=1                          #ala error codes
TRUE=1                                  #boolean
FALSE=0                                 #boolean
 
lockfile=/var/lock/subsys/nginx
NGINX_CONF_FILE="/usr/local/nginx/conf/nginx.conf"
 
#------------------------------------------------------------------------------
#                               Simple Tests
#------------------------------------------------------------------------------
 
#test if nginx is a file and executable
test -x $DAEMON || exit 0
 
# Include nginx defaults if available
if [ -f /etc/default/nginx ] ; then
        . /etc/default/nginx
fi
 
#set exit condition
#set -e
 
#------------------------------------------------------------------------------
#                               Functions
#------------------------------------------------------------------------------
 
setFilePerms(){
 
        if [ -f $PIDSPATH/$PIDFILE ]; then
                chmod 400 $PIDSPATH/$PIDFILE
        fi
}
 
configtest() {
	$DAEMON -t -c $NGINX_CONF_FILE
}
 
getPSCount() {
	return `pgrep -f $PS | wc -l`
}
 
isRunning() {
        if [ $1 ]; then
                pidof_daemon $1
                PID=$?
 
                if [ $PID -gt 0 ]; then
                        return 1
                else
                        return 0
                fi
        else
                pidof_daemon
                PID=$?
 
                if [ $PID -gt 0 ]; then
                        return 1
                else
                        return 0
                fi
        fi
}
 
#courtesy of php-fpm
wait_for_pid () {
        try=0
 
        while test $try -lt 35 ; do
 
                case "$1" in
                        'created')
                        if [ -f "$2" ] ; then
                                try=''
                                break
                        fi
                        ;;
 
                        'removed')
                        if [ ! -f "$2" ] ; then
                                try=''
                                break
                        fi
                        ;;
                esac
 
                #echo -n .
                try=`expr $try + 1`
                sleep 1
        done
}
 
status(){
	isRunning
	isAlive=$?
 
	if [ "${isAlive}" -eq $TRUE ]; then
                echo "$PIDNAME found running with processes:  `pidof $PS`"
        else
                echo "$PIDNAME is NOT running."
        fi
 
 
}
 
removePIDFile(){
	if [ $1 ]; then
                if [ -f $1 ]; then
        	        rm -f $1
	        fi
        else
		#Do default removal
		if [ -f $PIDSPATH/$PIDFILE ]; then
        	        rm -f $PIDSPATH/$PIDFILE
	        fi
        fi
}
 
start() {
        log_daemon_msg "Starting $DESCRIPTION"
 
	isRunning
	isAlive=$?
 
        if [ "${isAlive}" -eq $TRUE ]; then
                log_end_msg $SCRIPT_ERROR
        else
                start-stop-daemon --start --quiet --chuid $RUNAS --pidfile $PIDSPATH/$PIDFILE --exec $DAEMON \
                -- -c $NGINX_CONF_FILE
                setFilePerms
                log_end_msg $SCRIPT_OK
        fi
}
 
stop() {
	log_daemon_msg "Stopping $DESCRIPTION"
 
	isRunning
	isAlive=$?
        if [ "${isAlive}" -eq $TRUE ]; then
                start-stop-daemon --stop --quiet --pidfile $PIDSPATH/$PIDFILE
 
		wait_for_pid 'removed' $PIDSPATH/$PIDFILE
 
                if [ -n "$try" ] ; then
                        log_end_msg $SCRIPT_ERROR
                else
                        removePIDFile
	                log_end_msg $SCRIPT_OK
                fi
 
        else
                log_end_msg $SCRIPT_ERROR
        fi
}
 
reload() {
	configtest || return $?
 
	log_daemon_msg "Reloading (via HUP) $DESCRIPTION"
 
        isRunning
        if [ $? -eq $TRUE ]; then
		`killall -HUP $PS` #to be safe
 
                log_end_msg $SCRIPT_OK
        else
                log_end_msg $SCRIPT_ERROR
        fi
}
 
quietupgrade() {
	log_daemon_msg "Peforming Quiet Upgrade $DESCRIPTION"
 
        isRunning
        isAlive=$?
        if [ "${isAlive}" -eq $TRUE ]; then
		kill -USR2 `cat $PIDSPATH/$PIDFILE`
		kill -WINCH `cat $PIDSPATH/$PIDFILE.oldbin`
 
		isRunning
		isAlive=$?
		if [ "${isAlive}" -eq $TRUE ]; then
			kill -QUIT `cat $PIDSPATH/$PIDFILE.oldbin`
			wait_for_pid 'removed' $PIDSPATH/$PIDFILE.oldbin
                        removePIDFile $PIDSPATH/$PIDFILE.oldbin
 
			log_end_msg $SCRIPT_OK
		else
			log_end_msg $SCRIPT_ERROR
 
			log_daemon_msg "ERROR! Reverting back to original $DESCRIPTION"
 
			kill -HUP `cat $PIDSPATH/$PIDFILE`
			kill -TERM `cat $PIDSPATH/$PIDFILE.oldbin`
			kill -QUIT `cat $PIDSPATH/$PIDFILE.oldbin`
 
			wait_for_pid 'removed' $PIDSPATH/$PIDFILE.oldbin
                        removePIDFile $PIDSPATH/$PIDFILE.oldbin
 
			log_end_msg $SCRIPT_ok
		fi
        else
                log_end_msg $SCRIPT_ERROR
        fi
}
 
terminate() {
        log_daemon_msg "Force terminating (via KILL) $DESCRIPTION"
 
	PIDS=`pidof $PS` || true
 
	[ -e $PIDSPATH/$PIDFILE ] && PIDS2=`cat $PIDSPATH/$PIDFILE`
 
	for i in $PIDS; do
		if [ "$i" = "$PIDS2" ]; then
	        	kill $i
                        wait_for_pid 'removed' $PIDSPATH/$PIDFILE
			removePIDFile
		fi
	done
 
	log_end_msg $SCRIPT_OK
}
 
destroy() {
	log_daemon_msg "Force terminating and may include self (via KILLALL) $DESCRIPTION"
	killall $PS -q >> /dev/null 2>&1
	log_end_msg $SCRIPT_OK
}
 
pidof_daemon() {
    PIDS=`pidof $PS` || true
 
    [ -e $PIDSPATH/$PIDFILE ] && PIDS2=`cat $PIDSPATH/$PIDFILE`
 
    for i in $PIDS; do
        if [ "$i" = "$PIDS2" ]; then
            return 1
        fi
    done
    return 0
}
 
case "$1" in
  start)
	start
        ;;
  stop)
	stop
        ;;
  restart|force-reload)
	stop
	sleep 1
	start
        ;;
  reload)
	$1
	;;
  status)
	status
	;;
  configtest)
        $1
        ;;
  quietupgrade)
	$1
	;;
  terminate)
	$1
	;;
  destroy)
	$1
	;;
  *)
	FULLPATH=/etc/init.d/$PS
	echo "Usage: $FULLPATH {start|stop|restart|force-reload|status|configtest|quietupgrade|terminate|destroy}"
	echo "       The 'destroy' command should only be used as a last resort." 
	exit 1
	;;
esac
 
exit 0
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