Linux下，DIY apache和memcache守护进程

来源：互联网发布：网络服务器书籍编辑：程序博客网时间：2024/06/05 00:31

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        showHelpfi#正式/测试环境test=0if [ $# -eq 1 ]; then#       echo "$1"        if [ "$1" = "dev"  -o "$1" = "test" ]; then                test=1        else                showHelp        fifi#echo $testwebsrvkey=/bin/httpdwebsrvbin=/etc/init.d/apachectlcachekey=/memcachedcachebin=/usr/local/memcached/bin/memcachedcachepid=/usr/local/memcached/memcached.pidcachedir=/usr/local/memcached#run web serverfunction 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 cachefunction 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 dir  not 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 $cntif [ $cnt -le 0 ]; then        startwebficnt=`ps -ef | grep $cachekey | grep -vc grep`#echo $cntif [ $cnt -le 0  ]; then        startcachefi

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