Linux下，DIY apache和memcache守护进程
端午节，睡梦中，被电话惊醒，web服务器挂了，恼火坏了。登陆服务器一阵忙活，发现apache服务器和memcache服务器非法关闭了。哎，为了睡得安稳，抓紧写个小脚本来监控下appach和memcache吧！很快就有了下面的脚本：#!/bin/bash -
name=`basename $0 .sh`
function showHelp(){
echo "Usage: $name"
echo " $name test|dev"
exit 1
}
if [ $# -ne 0 -a $# -ne 1 ]; then
showHelp
fi
#正式/测试环境
test=0
if [ $# -eq 1 ]; then
# echo "$1"
if [ "$1" = "dev"-o "$1" = "test" ]; then
test=1
else
showHelp
fi
fi
#echo $test
websrvkey=/bin/httpd
websrvbin=/etc/init.d/apachectl
cachekey=/memcached
cachebin=/usr/local/memcached/bin/memcached
cachepid=/usr/local/memcached/memcached.pid
cachedir=/usr/local/memcached
#run web server
function startweb(){
echo "`date` start websrv..."
if [ ! -f $websrvbin ]; then
echo "`date` websrv bin [$websrvbin] not exist..."
return
fi
$websrvbin start
echo "`date` start websrv complete..."
}
#run cache
function startcache(){
echo "`date` start cache..."
if [ $test -eq 1 ]; then
cachebin=/usr/bin/memcached
fi
if [ ! -f $cachebin ]; then
echo "`date` cache bin [$cachebin] not exist..."
return
fi
if [ ! -d $cachedir ]; then
echo "`date` cache dirnot exist..."
mkdir $cachedir
echo "`date` create dir $cachedir"
fi
if [ $test -eq 0 ]; then
$cachebin -d -m 100 -uroot -l 0.0.0.0 -p 11000 -c 512 -P $cachepid
else
$cachebin -d -m 128 -l 192.168.119.60 -p 12000 -u ossh
fi
echo "`date` start cache complete..."
}
cnt=`ps -ef | grep $websrvkey | grep -vc grep`
# echo $cnt
if [ $cnt -le 0 ]; then
startweb
fi
cnt=`ps -ef | grep $cachekey | grep -vc grep`
#echo $cnt
if [ $cnt -le 0]; then
startcache
fi
把上面的脚本保存为monitorWebSrv.sh，并对该文件赋予可执行权限，进行如下操作：
chmod +x/etc/app/slightphp/public/csevent/bin/crontab/monitorWebSrv.sh
然后加入crontab计划任务，如下：
* * * * * /etc/app/slightphp/public/csevent/bin/crontab/monitorWebSrv.sh >> /tmp/monitorWebSrv.log
* * * * * sleep 30; /etc/app/slightphp/public/csevent/bin/crontab/monitorWebSrv.sh >> /tmp/monitorWebSrv.log
为什么加两条呢？为了每隔30秒执行一次！
对于shell和crontab，请参阅以前的blog：shell脚本比较运算符及逻辑运算符小结 、Linux Shell脚本逻辑操作符简介 及Linux
crontab命令小结
版权声明：本文为博主原创文章，未经博主允许不得转载。
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