monit 服务器监控

Monit是一款功能非常丰富的进程、文件、目录和设备的监测软件，用于Unix平台。它可以自动修复那些已经停止运作的程序，特使适合处理那些由于多种原因导致的软件错误。

官网：https://mmonit.com/monit
文档：https://mmonit.com/monit/documentation/monit.html

注意：Monit是一个开源工具，但M/Monit是收费的。

一、安装与配置

参考链接:
https://blog.csdn.net/arnold_wang/article/details/39855331
https://blog.csdn.net/qin_weilong/article/details/90639769

安装

yum install monit

配置

配置文件：/etc/monitrc

vim /etc/monitrc

#监控间隔
set daemon  30	# check services at 30 seconds intervals

#配置日志文件
set log syslog
set logfile /var/log/monit.log

#设置pid文件
set pidfile /var/run/monit.pid

#配置邮箱提醒
#其中用户名不用添加@xx.xxx
#password可以使用授权码
set mailserver smtp.163.com USERNAME "username" PASSWORD "password"
set mail-format {
 from: [email protected]
 subject: $SERVICE $EVENT at $DATE on $HOST
 message: Monit $ACTION $SERVICE $EVENT at $DATE on $HOST : $DESCRIPTION.
     Yours sincerely, Monit
 }
set alert [email protected]


#配置端口、访问IP地址和用户名密码
set httpd port 2812 and
    use address 192.168.20.24  # only accept connection from localhost (drop if you use M/Monit)
    allow 0.0.0.0/0.0.0.0        # allow localhost to connect to the server and
    allow admin:admin      # require user 'admin' with password 'monit'
#   with ssl {            # enable SSL/TLS and set path to server certificate
#       pemfile: /etc/ssl/certs/monit.pem
#   }

#监控主机状态
  check system localhost
    if loadavg (1min) > 4 then alert
    if loadavg (5min) > 2 then alert
    if cpu usage(user) > 95% for 10 cycles then alert
    if memory usage > 80% then alert
    if swap usage > 25% then alert
    
#监控进程
check process business MATCHING busniess.jar
        start program = "/project/introduce/business start 1>nohup.out 2>&1 &"
        stop program = "/project/introduce/business stop  1>nohup.out 2>&1 &"
        restart program = "/project/introduce/business restart 1>nohup.out 2>&1 &"
        if failed port 8088 type tcp then alert
        if failed port 8088 type tcp then restart
        if cpu > 60% for 2 cycles then alert
        if cpu > 80% for 5 cycles then restart

#监控服务
check process mysql with pidfile /var/run/mysqld/mysqld.pid
   group database
   start program = "/etc/init.d/mysqld start"
   stop program = "/etc/init.d/mysqld stop"
   if failed host 127.0.0.1 port 3306 then restart
   if 5 restarts within 5 cycles then timeout
   
#监控文件
check file httpd.conf with path /usr/local/apache/conf/httpd.conf
  if does not exist for 5 cycles then alert  #是否存在
  if changed size for  1 cycles then alert	  #改变大小
  if changed sha1 checksum then alter		  #改变sha1
  #时间戳是指文件属性里的创建、修改、访问的时间
  if changed timestamp alter	#改变形式
  if timestamp > 1 minute then alert	#常量模式
  #权限模块
  if failed permission 0555 then unmonitor  #权限
  if failed uid root then unmonitor	 #uid
  if failed gid root then unmonitor  #gid

#文件系统
check filesystem rootfs with path /
  if space usage > 80% then alert
  if changed fsflags then exec "/my/script"	 #标签
  alert root@localhost
  if changed pid then exec "/my/script"  #pid

配置完成后使用命令:

#更新配置文件,否则会报错
monit reload

#xxx为自定义进程名称
monit start xxx 

也可以在页面中启动检测服务:

浏览器中打开地址:http://ip:port

常用命令:

#查看版本
monit -V

#启动monit
monit -c /etc/monitrc

#停止monit
monit quit

#更新配置文件
monit reload

#输出monit监控服务的状态
monit status

#启动单个监控服务
monit start NAME

#停止单个监控服务
monit stop NAME

#启动所有监控服务
monit start all

#停止所有监控服务
monit stop all

常见错误

there is no service named xxx

配置文件没有更新，运行命令 monit reload 后重试