前言
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，适用于Linux/Unix平台。它可以监控服务器进程状态、HTTP/TCP状态码、服务器资源变化、文件系统变动等等，根据这些变化，可以设定邮件报警、重启进程或服务、自动修复那些已经停止运作的程序，特别适合处理那些由于多种原因导致的软件错误、监控系统关键的进程和资源。同时Monit 包含一个内嵌的 HTTP(S) Web 界面，你可以使用浏览器方便地查看 Monit 所监视的服务器。此外，M/Monit可以把多台安装Monit的服务器集中起来一起管理。
下面是引用官方的解释：
Monit is a small Open Source utility for managing and monitoring Unix systems. Monit conducts automatic maintenance and repair and can execute meaningful causal actions in error situations.
官网：https://mmonit.com/monit 文档：https://mmonit.com/monit/documentation/monit.html 最新版本：https://mmonit.com/monit/dist/binary/5.26.0/monit-5.26.0-linux-x64.tar.gz
安装
代码语言：javascript复制# 安装epel
[root@localhost software]# yum -y install epel-release
# 确认一下是否有monit包
[root@localhost software]# yum list| grep monit
....
monit.x86_64 5.26.0-1.el7 epel
monitor-edid.x86_64 3.2-1.el7 epel
monitorix.noarch
...
# 安装monit
[root@localhost software]# yum -y install monit
# 检验安装
[root@localhost software]# monit -V
This is Monit version 5.26.0
Built with ssl, with ipv6, with compression, with pam and with large files
Copyright (C) 2001-2019 Tildeslash Ltd. All Rights Reserved.
# 开启启动&启动服务
[root@localhost software]# systemctl start monit
[root@localhost software]# systemctl enable monit
Created symlink from /etc/systemd/system/multi-user.target.wants/monit.service to /usr/lib/systemd/system/monit.service.
[root@localhost software]# monit
Starting Monit 5.26.0 daemon with http interface at [localhost]:2812常用命令
代码语言：javascript复制monit -t # 配置文件检测
monit # 启动monit daemon
monit -c /var/monit/monitrc # 启动monit daemon时指定配置文件
monit reload # 当更新了配置文件需要重载
monit status # 查看所有服务状态
monit status nginx # 查看nginx服务状态
monit stop all # 停止所有服务
monit stop nginx # 停止nginx服务
monit start all # 启动所有服务
monit start nginx # 启动nginx服务
monit -V # 查看版本配置
代码语言：javascript复制/etc/monitrc # 主配置文件
/etc/monit.d/ # 单独配置各项服务为了文件和密码安全性，monitrc必须具有读写权限不超过0700(u=xrw,g=,o=)。
主配置文件
代码语言：javascript复制# 默认配置
[root@localhost software]# grep -v "^#" /etc/monitrc
set daemon 30 # check services at 30 seconds intervals
set log syslog
set httpd port 2812 and
use address localhost # only accept connection from localhost (drop if you use M/Monit)
allow localhost # allow localhost to connect to the server and
allow admin:monit # require user 'admin' with password 'monit'
#with ssl { # enable SSL/TLS and set path to server certificate
# pemfile: /etc/ssl/certs/monit.pem
#}
include /etc/monit.d/*
#修改后的
[root@localhost software]# grep -v "^#" /etc/monitrc
set daemon 30 # 每 30 秒检查被监控服务的状态
set log syslog
# 邮箱设置
set mailserver xxx@xxx
username "xxx" password "xxx"
# using ssl
set alert xxx@xxx
set alert xxx@xxx #可以设置多个
set mail-format {
from: xxx@xxx
subject: [$SERVICE] $EVENT
message:
[$SERVICE] $EVENT
Date: $DATE
Action: $ACTION
Host: $HOST
Description: $DESCRIPTION
Your faithful employee,
Monit }
set httpd port 2812 and # 监听端口
use address 192.168.3.100 # 监听地址
allow 192.168.3.100 # 这个一定要加，解决 Error receiving data -- Connection reset by peer 报错。
allow 192.168.3.0/24 # 允许192.168.3.0/24段访问
allow localhost # allow localhost to connect to the server and
#allow 0.0.0.0/0.0.0.0 # 允许任何地址访问
allow admin:monit # 访问web账密
#with ssl { # enable SSL/TLS and set path to server certificate
# pemfile: /etc/ssl/certs/monit.pem
#}
include /etc/monit.d/* # 监控服务配置文件目录监控项目配置
监控服务器配置我们统一放在/etc/monit.d/*。
Nginx
代码语言：javascript复制check process nginx with pidfile /usr/local/nginx/logs/nginx.pid
start program = "/usr/local/nginx/sbin/nginx"
stop program = "/usr/local/nginx/sbin/nginx -s stop"php-fpm
代码语言：javascript复制check process php-fpm with pidfile /usr/local/php/var/run/php-fpm.pid
start program = "/etc/init.d/php-fpm start"
stop program = "/etc/init.d/php-fpm stop"
if failed unixsocket /tmp/php-cgi.sock then restart
if 3 restarts within 5 cycles then timeout配置文件写好之后，我们执行monit -t检测一下语法，没问题的话monit reload就可以使其生效了。
[root@localhost monit.d]# monit reload
Reinitializing monit daemon
[root@localhost monit.d]# monit status
Monit 5.26.0 uptime: 2h 59m
Process 'php-fpm'
status OK
monitoring status Monitored
monitoring mode active
on reboot start
pid 10509
parent pid 1
uid 0
effective uid 0
gid 0
uptime 1d 15h 10m
threads 1
children 2
cpu 0.0%
cpu total 0.0%
memory 0.9% [4.5 MB]
memory total 3.2% [15.7 MB]
security attribute -
disk read 0 B/s [4 kB total]
disk write 0 B/s [4 kB total]
unix socket response time 0.026 ms to /tmp/php-cgi.sock type TCP protocol DEFAULT
data collected Fri, 15 May 2020 13:45:32
Process 'nginx'
status OK
monitoring status Monitored
monitoring mode active
on reboot start
pid 14722
parent pid 1
uid 0
effective uid 0
gid 0
uptime 33m
threads 1
children 1
cpu 0.0%
cpu total 0.0%
memory 0.6% [3.0 MB]
memory total 5.7% [27.7 MB]
security attribute -
disk write 0 B/s [4 kB total]
data collected Fri, 15 May 2020 13:45:32
System 'localhost.localdomain'
status OK
monitoring status Monitored
monitoring mode active
on reboot start
load average [0.00] [0.01] [0.05]
cpu 0.0%us 0.2%sy 0.0%wa
memory usage 269.7 MB [55.4%]
swap usage 138 MB [9.0%]
uptime 6d 22h 0m
boot time Fri, 08 May 2020 15:44:44
data collected Fri, 15 May 2020 13:45:32你也可以通过问吧web页面http://IP:2812查看状态。
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