防止Apache并发连接太多,超负荷运行导致系统崩溃 - 黑帽联盟

#!/bin/sh -e
#
# Check overload apache2
#
#最大Apache进程数，超过则重启Apache
maxpids=600
#检查进程时间间隔
interval=10
#日志文件
logfile=”/var/log/checkapache.log”
以上文件内容大致意思是每隔10秒种检查一次Apache进程数，如果超过600个Apache进程，则重启Apache服务，当然，这个maxpids和Interval参数依服务器承受能力而定。
echo ” Starting CheckApache MaxConn: $maxpids ” >> $logfile
date >> $logfile
while [ 1 ]
do
pnums=$(ps ax | grep “[/]usr/sbin/apache2″ | wc -l)
if [ “$pnums” = “0″ ]; then
sleep 5
echo “**********************************************” >> $logfile
date >> $logfile
echo “———Starting apache2….—————” >> $logfile
/etc/init.d/apache2 start >> $logfile
fi
#pids=$(ps ax | grep “[/]usr/sbin/apache2″ | awk ‘{print $1}’)
if [ $pnums -gt $maxpids ]; then
#echo $pnums
#for i in $pids; do
# kill $i
#done
#sleep 10
echo “**********************************************” >> $logfile
date >> $logfile
echo “Too much pids: $pnums ..Re Starting apache2….” >> $logfile
/etc/init.d/apache2 stop >> $logfile
sleep 5
/etc/init.d/apache2 start >> $logfile
sleep 2
fi
sleep $interval
done

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#!/bin/sh -e
# /var/log/checkrun
#
# Written by rocdk890
DAEMON=/var/log/checkapache
PIDFILE=/var/log/checkapache.pid
NAME=ChechApache
test -x $DAEMON || exit 0
. /lib/lsb/init-functions
if [ -f $PIDFILE ]
then
PID=`cat $PIDFILE`
if [ “x$PID” != “x” ] && kill -0 $PID 2>/dev/null ; then
STATUS=”PID: $PID :running”
RUNNING=1
else
STATUS=”PID $PID :not running”
RUNNING=0
fi
else
STATUS=”NO PIDFILE:not running”
RUNNING=0
fi
echo ” * $STATUS”
case “$1″ in
start)
log_begin_msg “Starting Apache-Check server: $NAME”
if [ $RUNNING = 1 ]; then
log_begin_msg “is running”
else
sudo start-stop-daemon –start –background -m –pidfile $PIDFILE –exec $DAEMON && log_end_msg 0 || log_end_msg 1
fi
;;
stop)
log_begin_msg “Stopping Apache-Check server: $NAME”
kill -9 $PID && log_end_msg 0 || log_end_msg 1
#sudo start-stop-daemon –stop –pidfile $PIDFILE –signal 1 –exec $DAEMON && log_end_msg 0 || log_end_msg 1
;;
*)
log_success_msg “Usage: $DEAMON {start|stop}”
exit 1
;;
esac
exit 0

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