monit监控tomcat service

利用monit对tomcat进行监控，在服务不可用的时候对tomcat进行重启。

1.安装monit

# apt-get install monit

2.配置monit

在/etc/monit/conf.d目录下面，创建一个tomcatrc的文件，写入如下内容

  check host all  with address localhost
    start program = "/home/ubuntu/webservice/apache-tomcat-8.0.30/bin/startup.sh " with timeout 60 seconds
    stop program  = "/home/ubuntu/webservice/apache-tomcat-8.0.30/bin/shutdown.sh"
#    if cpu > 60% for 2 cycles then alert
#    if cpu > 80% for 5 cycles then restart
#    if totalmem > 200.0 MB for 5 cycles then restart
#    if children > 250 then restart
#    if loadavg(5min) greater than 10 for 8 cycles then stop
    if failed host localhost port 80 protocol http
       and request "/auto/health"
       then restart
#    if failed port 443 type tcpssl protocol http
#       with timeout 15 seconds
#       then restart
#    if 3 restarts within 5 cycles then timeout
#    depends on apache_bin
#    group server

上面主要是监控tomcat的服务，如果 /auto/health无法获得有效的数据，那么monit就会对服务进行重启。

3.启动、停止monit

# /etc/init.d/monit start | stop