一个监控mysql主从健康状态的shell脚本

#!/bin/bash
#define mysql variable
#edit www.jb200.com
mysql_user="root"
mysql_pass="123456"
email_addr="slave@jb200.com"
    
mysql_status=`netstat -nl | linuxjishu/13830.html target=_blank class=infotextkey>awk 'NR>2{if ($4 ~ /.*:3306/) {print "Yes";exit 0}}'`
if [ "$mysql_status" == "Yes" ];then
            slave_status=`mysql -u${mysql_user} -p${mysql_pass} -e"show slave statusG" | grep "Running" | awk '{if ($2 != "Yes") {print "No";exit 1}}'`
            if [ "$slave_status" == "No" ];then
                    echo "slave is not working!"
                    [ ! -f "/tmp/slave" ] && echo "Slave is not working!" | mail -s "Warn!MySQL Slave is not working" ${email_addr}
                    touch /tmp/slave
            else
                    echo "slave is working."
                    [ -f "/tmp/slave" ] && rm -f /tmp/slave
            fi
            [ -f "/tmp/mysql_down" ] && rm -f /tmp/mysql_down
    else
            [ ! -f "/tmp/mysql_down" ] && echo "Mysql Server is down!" | mail -s "Warn!MySQL server is down!" ${email_addr}
            touch /tmp/mysql_down
    fi