My mail system is postfix on centos 5.5, it's too old, and I can't update now.

Build new mail system on day of unemployment.

The new one is is Debian8.

When you have done by Debian installed.

root at debian:~# netstat -ntulp |grep :25
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      654/exim4  
tcp6       0      0 ::1:25                  :::*                    LISTEN      654/exim4

root at debian:~# lsof -Pni :25
COMMAND PID        USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
exim4   654 Debian-exim    4u  IPv4  11812      0t0  TCP localhost:smtp (LISTEN)
exim4   654 Debian-exim    5u  IPv6  11813      0t0  TCP localhost:smtp (LISTEN)

remove exim4*

最近發現似乎用不到CHEF這麼大且需要HOST和CLIENT架構的輔助軟體

當然它還是有很方便的地方，例如可以在HOST看狀態等等

看了最近的DEVOPS介紹發現ANSIBLE實在是比較符合

先寫一個小PLAYBOOK測試一下

ansible-playbook checkmirror.yml

##### Update showterm link to Https #####

通常在使用OPENNMS來作監控時，內建的系統常常只有"通用"的SERVICE PORT

許多的自行定義服務及埠號，都必要靠自己建立

照著圖片點下

這邊要指定埠號及多久逾時、重試次數