监控MySQL或Web服务是否正常

  在工作中,我们往往利用脚本定时监控本地、远端数据库服务端或Web服务是否运行正常,例如:负载高、cup高、连接数满了等....

方法一:根据端口

 本地:netstat/ss/lsof

①   netstat –lntup|grep 3306|wc –l

②   ss –lntup|grep 3306|wc -l

③   lsof –I :3306|grep mysql|wc –l

  远程:telnet/nmap/nc

①echo -e "\n"|telnet baidu.com 80|grep Connected|wc

②namp www.baidu.com -p 80|grep open|wc-l

方法二:根据进程

ps -ef|grep mysql|wc -l

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wget/curl (http方式,判断根据返回值或返回内容)

header(http)根据状态码判断

数据库特有,通过mysql客户端连接,根据返回值或返回内存判断。

测试:以mysql为例(端口)

本地:

vim bqh.sh

#!/bin/sh
if [ `lsof -i tcp:3306|wc -l` -gt 0 ]
      then
    echo "MySQL is Running."
else
   echo "MySQL is Stopped."
   /etc/init.d/mysqld start
   echo "MySQL is Starting......"
fi

执行脚本后效果如下:

当然我们还可以用其它命令方法检测:

[root@lamp01 scripts]# vim bqh.sh 

#!/bin/sh
#if [ `lsof -i tcp:3306|wc -l` -gt 0 ]
#if [ `ps -ef|grep mysql|grep -v grep|wc -l` -gt 0 ] #注意脚本名字不能带mysql,自己也算进程
#if [ `netstat -lntup|grep mysql|wc -l` -gt 0 ] 
if [ "`netstat -lnt|grep 3306|awk -F "[ :]+" '{print $5}'`" = "3306" ]
    then
    echo "MySQL is Running."
else
   echo "MySQL is Stopped."
   /etc/init.d/mysqld start
   echo "MySQL is Starting......"
fi

注意:

如果mysql没启动,空值-eq 3306 会报错,如果以字符串的方式比较不会。

远程:

脚本如下:

vim jkmysql.sh

#!/bin/sh
#remote
#if [ `nc -w 2  192.168.43.118 3306 &>/null&&echo ok|wc -l` -gt 0 ]
if [ `nmap 192.168.43.118 -p 3306 2>/dev/null|grep open|wc -l` -gt 0 ]
    then
  echo "MySQL is Running..."
else
  echo "MySQL is Stopped."
  ssh -p22 [email protected] "/etc/init.d/mysqld start" #此处需要做免密交互远程登录执行命令,https://www.cnblogs.com/su-root/p/10128237.html
  echo "MySQL is Starting......"
fi

我们在192.168.43.117机器上执行上面的脚本:

我们现在在192.168.43.118机器上把mysql服务关闭,然后再在192.168.43.117机器上执行脚本:

==========================华丽的分割线=================================

测试:以web为例

首先我们先启动nginx服务:

[root@lamp01 scripts]# /application/nginx/sbin/nginx
[root@lamp01 scripts]# curl -I -s www.jyw1.com|head -1
HTTP/1.1 200 OK
[root@lamp01 scripts]# curl -I www.jyw1.com 2>/dev/null |head -1
HTTP/1.1 200 OK
[root@lamp01 scripts]# 

curl -I -s www.jyw1.com|head -1 等价于 curl -I www.jyw1.com 2>/dev/null |head -1

脚本如下:

vim web.sh 

#!bin/sh
if [ `curl -I -s www.jyw1.com|head -1|egrep "200"|wc -l` -eq 1 ]
 then
  echo "httpd is Running..."
else
  echo "httpd is Stopped!"
  /application/nginx/sbin/nginx
  echo "please wait..."
  echo "httpd is Runing......"
fi

当然我们还可以用其它命令方法检测:

脚本如下:

#!/bin/sh
if [ "`curl -s www.jyw1.com &>/dev/null&&echo $?`" = "0" ]  
 then
  echo "Httpd is Running..."
else
  echo "Httpd is Stoped..."
  /application/nginx/sbin/nginx
  echo "please wait..."
  echo "httpd is Runing......"
fi

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转载自www.cnblogs.com/su-root/p/10409973.html