今天无意中看到这样一个服务：monit，跑在linux/unix平台，可用于监控本地资源，触发告警和动作。
安装
yum install monit -y
配置
[root@lvs122101master monit.d]# cat /etc/monit.conf |grep -v '^#' set daemon 600 set mailserver 192.168.11.27 set alert shanks@null.com with reminder on 1 cycle include /etc/monit.d/*
[root@lvs122101master monit.d]# cat /etc/monit.d/system
check device gen with path /dev/mapper/vg_livedvd-lv_root
if space usage > 50% then alert启动
/etc/init.d/monit start
查看日志
[root@lvs122101master log]# tail -f monit [CST Nov 26 10:39:10] info : Monit started [CST Nov 26 10:39:10] error : 'gen' space usage 76.6% matches resource limit [space usage>50.0%] [CST Nov 26 10:40:11] info : Monit has not changed [CST Nov 26 10:40:11] error : 'gen' space usage 76.6% matches resource limit [space usage>50.0%] [CST Nov 26 10:40:59] info : monit daemon with pid [21487] killed [CST Nov 26 10:40:59] info : Monit stopped [CST Nov 26 10:41:03] info : Monit started [CST Nov 26 10:41:03] error : 'gen' space usage 76.6% matches resource limit [space usage>50.0%] [CST Nov 26 10:41:08] error : Sendmail: error receiving data from the mailserver '192.168.80.27' -- Resource temporarily unavailable [CST Nov 26 10:41:08] error : Aborting event
告警邮件格式
Resource limit matched Service gen
Date: Tue, 26 Nov 2013 10:40:11 +0800
Action: alert
Host: lvs122101master
Description: 'gen' space usage 76.6% matches resource limit [space usage>50.0%]
Your faithful employee,
monit监控自定义服务
# 监控nginx
#
# 需要提供进程pid文件信息
check process nginx with pidfile /var/run/nginx.pid
# 进程启动命令行，注：必须是命令全路径
start program = "/etc/init.d/nginx start"
# 进程关闭命令行
stop program = "/etc/init.d/nginx stop"
# nginx进程状态测试，监测到nginx连不上了，则自动重启
if failed host www.example.com port 80 protocol http then restart
# 多次重启失败将不再尝试重启，这种就是系统出现严重错误的情况
if 3 restarts within 5 cycles then timeout
# 可选，设置分组信息
group server
# 可选的ssl端口的监控，如果有的话
# if failed port 443 type tcpssl protocol http
# with timeout 15 seconds
# then restart
#
# 监控apache
#
check process apache with pidfile /var/run/apache2.pid
start program = "/etc/init.d/apache2 start"
stop program = "/etc/init.d/apache2 stop"
# apache吃cpu和内存比较厉害，额外添加一些关于这方面的监控设置
if cpu > 50% for 2 cycles then alert
if cpu > 70% for 5 cycles then restart
if totalmem > 1500 MB for 10 cycles then restart
if children > 250 then restart
if loadavg(5min) greater than 10 for 20 cycles then stop
if failed host www.example.com port 8080 protocol http then restart
if 3 restarts within 5 cycles then timeout
group server
# 可选，依赖于nginx
depends on nginx
#
# 监控spawn-fcgi进程(其实就是fast-cgi进程)
#
check process spawn-fcgi with pidfile /var/run/spawn-fcgi.pid
# spawn-fcgi一定要带-P参数才会生成pid文件，默认是没有的
start program = "/usr/bin/spawn-fcgi -a 127.0.0.1 -p 8081 -C 10 -u userxxx -g groupxxx -P /var/run/spawn-fcgi.pid -f /usr/bin/php-cgi"
stop program = "/usr/bin/killall /usr/bin/php-cgi"
# fast-cgi走的不是http协议，monit的protocol参数也没有cgi对应的设置，这里去掉protocol http即可。
if failed host 127.0.0.1 port 8081 then restart
if 3 restarts within 5 cycles then timeout
group server
depends on nginx
