まぁーここまでしなくてもプログラムやmod_rewrite使えば済みますが･･･
ちょっと試してみたかったのでやってみました。
httpd.confファイルに
こんな感じでIfDefineディレクティブを追加
<IfDefine MAINTE> DocumentRoot "/var/www/mainte" DirectoryIndex mainte.html </IfDefine>
これだけだとあれなんで･･･
Apache起動スクリプトにメンテモードを追加
起動オプションにmainteを追加します。
以下のような感じです･･。
#!/bin/bash
#
# httpd Startup script for the Apache HTTP Server
#
# chkconfig: - 85 15
# description: Apache is a World Wide Web server. It is used to serve \
# HTML files and CGI.
# processname: httpd
# config: /etc/httpd/conf/httpd.conf
# config: /etc/sysconfig/httpd
# pidfile: /var/run/httpd.pid
# Source function library.
. /etc/rc.d/init.d/functions
if [ -f /etc/sysconfig/httpd ]; then
. /etc/sysconfig/httpd
fi
# Start httpd in the C locale by default.
HTTPD_LANG=${HTTPD_LANG-"C"}
# This will prevent initlog from swallowing up a pass-phrase prompt if
# mod_ssl needs a pass-phrase from the user.
INITLOG_ARGS=""
# Set HTTPD=/usr/sbin/httpd.worker in /etc/sysconfig/httpd to use a server
# with the thread-based "worker" MPM; BE WARNED that some modules may not
# work correctly with a thread-based MPM; notably PHP will refuse to start.
# Path to the apachectl script, server binary, and short-form for messages.
apachectl=/usr/sbin/apachectl
httpd=${HTTPD-/usr/sbin/httpd}
prog=httpd
pidfile=${PIDFILE-/var/run/httpd.pid}
lockfile=${LOCKFILE-/var/lock/subsys/httpd}
RETVAL=0
# check for 1.3 configuration
check13 () {
CONFFILE=/etc/httpd/conf/httpd.conf
GONE="(ServerType|BindAddress|Port|AddModule|ClearModuleList|"
GONE="${GONE}AgentLog|RefererLog|RefererIgnore|FancyIndexing|"
GONE="${GONE}AccessConfig|ResourceConfig)"
if LANG=C grep -Eiq "^[[:space:]]*($GONE)" $CONFFILE; then
echo
echo 1>&2 " Apache 1.3 configuration directives found"
echo 1>&2 " please read /usr/share/doc/httpd-2.0.52/migration.html"
failure "Apache 1.3 config directives test"
echo
exit 1
fi
}
# The semantics of these two functions differ from the way apachectl does
# things -- attempting to start while running is a failure, and shutdown
# when not running is also a failure. So we just do it the way init scripts
# are expected to behave here.
start() {
echo -n $"Starting $prog: "
check13 || exit 1
LANG=$HTTPD_LANG daemon $httpd $OPTIONS
RETVAL=$?
echo
[ $RETVAL = 0 ] && touch ${lockfile}
return $RETVAL
}
maintestart() {
echo -n $"Maintenance Mode Starting $prog: "
check13 || exit 1
LANG=$HTTPD_LANG daemon $httpd -DMAINTE
RETVAL=$?
echo
[ $RETVAL = 0 ] && touch ${lockfile}
return $RETVAL
}
# When stopping httpd a delay of >10 second is required before SIGKILLing the
# httpd parent; this gives enough time for the httpd parent to SIGKILL any
# errant children.
stop() {
echo -n $"Stopping $prog: "
killproc -d 10 $httpd
RETVAL=$?
echo
[ $RETVAL = 0 ] && rm -f ${lockfile} ${pidfile}
}
reload() {
echo -n $"Reloading $prog: "
if ! LANG=$HTTPD_LANG $httpd $OPTIONS -t >&/dev/null; then
RETVAL=$?
echo $"not reloading due to configuration syntax error"
failure $"not reloading $httpd due to configuration syntax error"
else
killproc $httpd -HUP
RETVAL=$?
fi
echo
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
status)
status $httpd
RETVAL=$?
;;
restart)
stop
start
;;
condrestart)
if [ -f ${pidfile} ] ; then
stop
start
fi
;;
reload)
reload
;;
graceful|help|configtest|fullstatus)
$apachectl $@
RETVAL=$?
;;
mainte)
stop
maintestart
;;
*)
echo $"Usage: $prog {start|stop|restart|condrestart|reload|status|fullstatus|graceful|help|configtest|mainte}"
exit 1
esac
exit $RETVAL
これでservice httpd mainteと入力すると
メンテモードで起動できます。
[root@localhost ~]# service httpd mainte httpd を停止中: [ OK ] Maintenance Mode Starting httpd: [ OK ]
psコマンドで確認すると
[root@localhost ~]# ps aux | grep httpd root 31760 0.4 1.8 30364 14628 ? Ss 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31762 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31763 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31764 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31765 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31766 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31767 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31768 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE apache 31769 0.0 1.3 30364 10384 ? S 19:56 0:00 /usr/sbin/httpd -DMAINTE root 31773 0.0 0.0 4984 760 pts/0 R+ 19:58 0:00 grep httpd
メンテモードで起動されているのが分かります。
元に戻すときは
[root@localhost ~]# service httpd restart
まぁーラウンドロビンで複数台あると面倒なのでこれは向かないですが･･･
参考になれば幸いです。
参考Apacheマニュアル
IfDefineディレクティブ
