shell 监控mysql状态

#!/bin/bash 
#/usr/bin/nmap localhost | grep 3306 
#lsof -i:3306 
MYSQLPORT=`netstat -na|grep "LISTEN"|grep "3306"|awk -F[:" "]+ ‘{print $5}‘`

function checkMysqlStatus(){ 
/usr/bin/mysql -uroot -paaaaaa --connect_timeout=5 -e "show databases;" &>/dev/null 2>&1 
if [ $? -ne 0 ] 
then 
restartMysqlService 
if [ "$MYSQLPORT" == "3306" ];then 
echo "mysql restart successful......" 
else 
echo "mysql restart failure......" 
echo "Server: $MYSQLIP mysql is down, !" > /var/log/mysqlerr 
#mail -s "WARN! server: $MYSQLIP mysql is down" [email protected] < /var/log/mysqlerr 
fi 
else 
echo "mysql is running..." 
fi 
}

function restartMysqlService(){ 
echo "try to restart the mysql service......" 
/bin/ps aux |grep mysql |grep -v grep | awk ‘{print $2}‘ | xargs kill -9 
service mysql start 
}

if [ "$MYSQLPORT" == "3306" ] 
then 
checkMysqlStatus 
else 
restartMysqlService 
fi