shell脚本：监控MySQL服务是否正常

监控MySQL服务是否正常，通常的思路为：检查3306端口是否启动，ps查看mysqld进程是否启动，命令行登录mysql执行语句返回结果，php或jsp程序检测（需要开发人员开发程序）等等；方法1：监听3306端口#！/bin/bash
#written by linuxidc@2015-10-15

port=`netstat -nlt|grep 3306|wc -l`
if [ $port -ne 1 ]
then
/etc/init.d/mysqld start
else
echo "MySQL is running"
fi方法2：查看mysqld进程注意注意：如果使用进程过滤的话，脚本名称如果里面包含mysql的话，脚本执行有坑，切记！！！因为会把脚本也grep了一次，导致结果不准确；[root@localhost baby]# cat check_mysql.sh
#！/bin/bash
#written by linuxidc@2015-10-15

process=`ps -ef |grep mysql|grep -v grep |wc -l`
if [ $process -ne 2 ]
then
/etc/init.d/mysqld start
else
echo "MySQL is running"
fi执行结果如下：[root@localhost baby]# sh check_mysql.shStarting MySQL SUCCESS！改名之后执行为正常结果：[root@localhost baby]# mv check_mysql.sh check_db.sh[root@localhost baby]# sh check_db.shMySQL is running方法3:双保险，进程和端口都成功才算mysql服务正常#！/bin/bash
#written by linuxidc@2015-10-15

port=`netstat -nlt|grep 3306|wc -l`
process=`ps -ef |grep mysql|grep -v grep |wc -l`
if [ $port -eq 1 ] && [ $process -eq 2 ]
then
echo "MySQL is running"
else
/etc/init.d/mysqld start
fi4:使用客户端登录mysql执行命令，查看返回结果测试服务是否启动，理论上此方法最可靠。[root@localhost baby]# cat check_db_client.sh
#！/bin/bash
#written by linuxidc@2015-10-15

mysql -uroot -p123456 -e "select version（）;" &>/dev/null
if [ $？ -ne 0 ]
then
/etc/init.d/mysqld start
else
echo "MySQL is running"
fi执行结果如下：[root@localhost baby]# sh check_db_client.shMySQL is running本文永久更新链接地址