4月 272010
 

Varnishで再起動を伴わずに設定の再読込を行いたいときはvarnishadmかtelnetで入って以下のような感じでコマンドを打たないといけません


varnishadm -T 192.168.1.123:6082 vcl.load testvcl /etc/varnish/default.vcl
varnishadm -T 192.168.1.123:6082 vcl.use testvcl

正直めんどくさいです
かといって普通に/etc/init.d/varnish reloadとかやると再起動していしまいせっかく溜め込んだキャッシュがクリアされてしまいます

/etc/init.d/varnishの一部から


restart() {
        stop
        start
}

reload() {
        restart
}

ということでgracefulオプションを追加してreloadもそれに割り当ててみました

4/28に修正版をアップしました

/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"
################################
ADM=`ps axut | grep varnishd|grep -v grep |head -n 1|sed -e "s/$/ /g"|sed -e "s/^.\+-T \+\([^ ]\+\).\+$/\1/g"`
VCL=`ps axut | grep varnishd|grep -v grep |head -n 1|sed -e "s/$/ /g"|sed -e "s/^.\+-f \+\([^ ]\+\).\+$/\1/g"`
NOW=`date +%s`
################################
# Include varnish defaults
[ -e /etc/sysconfig/varnish ] && . /etc/sysconfig/varnish

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: $VCL
	varnishadm -T $ADM vcl.load reload$NOW $VCL || 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 $?

元ファイルとのDIFF


[root@LIP-APP-01 ~]# diff /etc/init.d/varnish varnish
30,34c30
< ################################
< ADM=`ps axut | grep varnishd|grep -v grep |head -n 1|sed -e "s/$/ /g"|sed -e "s/^.\+-T \+\([^ ]\+\).\+$/\1/g"`
< VCL=`ps axut | grep varnishd|grep -v grep |head -n 1|sed -e "s/$/ /g"|sed -e "s/^.\+-f \+\([^ ]\+\).\+$/\1/g"`
< NOW=`date +%s`
< ################################
---
>
90,103c86
< graceful() {
<       echo reload VCL file: $VCL
<       varnishadm -T $ADM vcl.load reload$NOW $VCL || 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
< }
---
>
110c93
<       graceful
---
>       restart
138,140d120
<       graceful)
<               $1
<               ;;
141a122
>               rh_status_q || exit 7
155c136
<       echo "Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|graceful|force-reload}"
---
>       echo "Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"

これで
/etc/init.d/varnish graceful
をすることでいま読み込んでる設定ファイルを再読み込みします

実行結果


[root@LIP-APP-01 ~]# date;ps axut | grep varnish;/etc/init.d/varnish reload;ps axut | grep varnish
2010年  4月 27日 火曜日 20:45:04 JST
root     27984  0.0  0.1 106492  1096 ?        Ss   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
varnish  27985  0.0  0.3 281728  3604 ?        Sl   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
root     28135  0.0  0.0  65368   828 pts/0    S+   20:45   0:00 grep varnish
reload VCL file: /etc/varnish/default.vcl
VCL compiled.

Current configs:
                                                           [  OK  ]
available       0 boot
available       0 reload1272368689
available       1 reload1272368699
active          0 reload1272368704

root     27984  0.0  0.1 106492  1100 ?        Ss   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
varnish  27985  0.0  0.3 283796  3620 ?        Sl   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
root     28164  0.0  0.0  65368   836 pts/0    S+   20:45   0:00 grep varnish
[root@LIP-APP-01 ~]#

失敗の場合もプロセスは死んでない


[root@LIP-APP-01 ~]# date;ps axut | grep varnish;/etc/init.d/varnish reload;ps axut | grep varnish
2010年  4月 27日 火曜日 20:47:05 JST
root     27984  0.0  0.1 106492  1100 ?        Ss   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
varnish  27985  0.0  0.3 283796  3620 ?        Sl   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
root     28241  0.0  0.0  65368   832 pts/0    S+   20:47   0:00 grep varnish
reload VCL file: /etc/varnish/default.vcl
Command failed with error code 106
                                                           [失敗]
root     27984  0.0  0.1 106492  1100 ?        Ss   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
varnish  27985  0.0  0.3 283796  3620 ?        Sl   20:43   0:00 /usr/sbin/varnishd -P /var/run/varnish.pid -a :80 -T 192.168.1.123:6082 -f /etc/varnish/default.vcl -u varnish -g varnish -s malloc,700M
root     28263  0.0  0.0  65368   836 pts/0    S+   20:47   0:00 grep varnish
[root@LIP-APP-01 ~]#

見てもらえばわかるとおもうのですが
動くのが第一目的だったためPORTの取得とかをかなり強引な方法(grepとかのあわせ技)でやりましたので(デフォルトのsysconfigでいけたらいいなとおもったので・・・)
不具合とか出たら教えてもらえるとありがたいなーと


参考サイト

Easy reloading of varnish’ VCL


 Posted by at 8:56 午後  Tagged with:

  2 Responses to “Varnishで再起動無しで設定ファイルを適用する方法(reload)”

  1. sysconfigに変数定義できれば楽なんだよなーそのバージョンも一応書こうかしら?

  2. […] This post was mentioned on Twitter by iara, \いわなちゃん/. \いわなちゃん/ said: [blog] Varnishで再起動無しで設定ファイルを適用する方法(reload) http://is.gd/bJIcO […]

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