由于一台WEB服务器的Memcached死掉而导致在访问网站的某些页面时候打不开，下面脚本会自动检测Memcached的进程，如果挂掉则自动重启Memcached服务。

cat /root/sh/memcached_check.sh#!/bin/sh#check memcached process and restart if downPATH=$PATH:/opt/env/memcache/bin/memcachedDATE=`date -d "today" +"%Y-%m-%d-%H:%M"`#用ps命令查看memcached进程MM=`ps -aux |grep "memcached" |grep "11211" |grep -v "grep" |wc -l`#if语句判断进程是否存在，如果不存在，输出日志记录并重启memcached服务if [ "$MM" == "0" ]; then    echo "$DATE The memcached is problem and restart" >> /root/sh/memcached_check.logs/opt/env/memcache/bin/memcached -t 8 -d -m 2048 -p 11211 -u nobody    else#echo "$DATE The memcached is ok" >>/root/sh/memcached_check.logsfi #添加计划任务，每5分钟检测一次。*/5 * * * * /bin/bash    /root/sh/memcached_check.sh