Varnishを再起動無しで設定を適用する方法(修正版)

昨日プロセスを強引にとる手法でやったところ
もっといい方法があるよと@mikedaさんが教えてくれましたので修正しました
自前で作るRPMのvarnishのinit.dはこれでいこうかなーと

/etc/init.d/varnish

#! /bin/sh
#
# varnish Control the varnish HTTP accelerator
#
# chkconfig: - 90 10
# description: Varnish is a high-perfomance HTTP accelerator
# processname: varnishd
# config: /etc/sysconfig/varnish
# pidfile: /var/run/varnish/varnishd.pid

### BEGIN INIT INFO
# Provides: varnish
# Required-Start: $network $local_fs $remote_fs
# Required-Stop: $network $local_fs $remote_fs
# Should-Start: $syslog
# Short-Description: start and stop varnishd
# Description: Varnish is a high-perfomance HTTP accelerator
### END INIT INFO

# Source function library.
. /etc/init.d/functions

retval=0
pidfile=/var/run/varnish.pid

exec="/usr/sbin/varnishd"
prog="varnishd"
config="/etc/sysconfig/varnish"
lockfile="/var/lock/subsys/varnish"
# Include varnish defaults
[ -e /etc/sysconfig/varnish ] && . /etc/sysconfig/varnish
################################
PID=`cat /var/run/varnish.pid`
ADM=`cat /proc/$PID/cmdline|tr '\0' '!'|sed -e "s/^.*-T\!\([^\!]\\+\)\!.*$/\\1/g"`
NOW=`date +%s`
if [ -z $VARNISH_VCL_CONF ]; then
	VARNISH_VCL_CONF=`cat /proc/$PID/cmdline|tr '\0' '!'|sed -e "s/^.*-f\!\([^\!]\\+\)\!.*$/\\1/g"`
fi
################################

start() {

	if [ ! -x $exec ]
	then
		echo $exec not found
		exit 5
	fi

	if [ ! -f $config ]
	then
		echo $config not found
		exit 6
	fi
	echo -n "Starting varnish HTTP accelerator: "

	# Open files (usually 1024, which is way too small for varnish)
	ulimit -n ${NFILES:-131072}

	# Varnish wants to lock shared memory log in memory.
	ulimit -l ${MEMLOCK:-82000}

	# $DAEMON_OPTS is set in /etc/sysconfig/varnish. At least, one
	# has to set up a backend, or /tmp will be used, which is a bad idea.
	if [ "$DAEMON_OPTS" = "" ]; then
		echo "\$DAEMON_OPTS empty."
		echo -n "Please put configuration options in $config"
		return 6
	else
		# Varnish always gives output on STDOUT
		daemon   $exec -P $pidfile "$DAEMON_OPTS" > /dev/null 2>&1
		retval=$?
		if [ $retval -eq 0 ]
		then
			touch $lockfile
			echo_success
			echo
		else
			echo_failure
		fi
		return $retval
	fi
}

stop() {
	echo -n "Stopping varnish HTTP accelerator: "
	killproc $prog
	retval=$?
	echo
	[ $retval -eq 0 ] && rm -f $lockfile
	return $retval
}
graceful() {
	echo reload VCL file: $VARNISH_VCL_CONF
	varnishadm -T $ADM vcl.load reload$NOW $VARNISH_VCL_CONF || error
	varnishadm -T $ADM vcl.use reload$NOW || error
	echo Current configs:
	echo_success
	echo
	varnishadm -T $ADM vcl.list
}
error(){
	echo_failure
	echo
	exit 1
}
restart() {
	stop
	start
}

reload() {
	graceful
}

force_reload() {
	restart
}

rh_status() {
	status $prog
}

rh_status_q() {
	rh_status >/dev/null 2>&1
}

# See how we were called.
case "$1" in
	start)
		rh_status_q && exit 0
		$1
		;;
	stop)
		rh_status_q || exit 0
		$1
		;;
	restart)
		$1
		;;
	graceful)
		$1
		;;
	reload)
		$1
		;;
	force-reload)
		force_reload
		;;
	status)
		rh_status
		;;
	condrestart|try-restart)
		rh_status_q || exit 0
		restart
		;;
	*)
	echo "Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|graceful|force-reload}"

	exit 2
esac

exit $?

sysconfigでVCLファイルの定義がされている場合はそれを優先して読み込むように修正しました(VARNISH_VCL_CONF)
またプロセスの引数はPIDファイルで特定したプロセスから取得することでよりスマートに！

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