来源：http://coolner.blog.51cto.com/957576/688188

检测nginx服务中断并自动启动脚本：

if ps aux | grep 'nginx' | grep -v grep  > /dev/null ; then
     echo "nginx is runnning !"    
else
     echo "nginx is down. Starting over..."
     /etc/init.d/nginx start
fi

将此脚本保存为nginx-running.sh，在crontab加入每分钟检测一次计划即可。