在Ubuntu上安装Monit来监控服务器和环境

说明：相信很多人都遇到过 “502错误”、 “2002数据库无法连接” “ERR_NAME_NOT_RESOLVED” 等问题吧，一般来说是Apache Httpd、Nginx、PHP、MySQL等软件崩溃或者不稳定出现了相关问题。这时候我们可以利用Monit来监控服务器和环境，当出现意外的时候还可以自动实现重启。

安装

1、更新软件源缓存

apt update

2、安装Monit

apt install monit -y

升级

1、关闭monint

service monit stop

2、安装html2text以自动解析最细版本：

apt install html2text -y

3、自动更新

MONITVER=$(wget -q https://mmonit.com/monit/dist/binary/ -O - | html2text | grep DIR | tail -n 1 | tr -d / | awk '{print $2}')
cd /tmp
wget https://mmonit.com/monit/dist/binary/$MONITVER/monit-$MONITVER-linux-x64.tar.gz
tar -xf monit-*
cd monit-*
sudo cp bin/monit /usr/bin/monit
sudo ln -s /etc/monit/monitrc /etc/monitrc

4、重启monint

service monit restart

配置

1、备份原始配置

mv /etc/monit/monitrc /etc/monit/monitrc.bak

2、创建SSL证书，实现HTTPS安全传输，演示用的是OpenSSL的自签，一路回车就行　：

mkdir -p /var/certs/
openssl req -new -x509 -days 365 -nodes -out /var/certs/monit.pem -keyout /var/certs/monit.pem

chmod 0700 /var/certs/monit.pem

3、创建新配置
创建一份新的/etc/monit/monitrc文件，内容：

 set daemon 60 #check services every 60 seconds
  set logfile /var/log/monit.log
  set idfile /var/lib/monit/id
  set statefile /var/lib/monit/state

#Event queue
  set eventqueue
      basedir /var/lib/monit/events # set the base directory where events will be stored
      slots 100                     # optionally limit the queue size

#Mail settings

#http settings
 set httpd port 52822 address 0.0.0.0  # 配置端口为adapters
    ssl enable #启用 SSL
    pemfile  /var/certs/monit.pem #生成的SSL地址
    allow 0.0.0.0/0.0.0.0 # 允许访问的IP
    allow monit.wxiou.cn        # 绑定的域名
    allow rats:"www.wxiou.cn"      # 账号为rats ，密码为www.wxiou.cn

#allow modular structure
    include /etc/monit/conf.d/*
    include /etc/monit/conf-enabled/*

4、给予权限