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一台ubuntu server的服务器，登录时发现motd信息被打印了两次：

Welcome to Ubuntu 14.04 LTS (GNU/Linux 3.13.0-32-generic x86_64)

* Documentation: https://help.ubuntu.com/

System information as of Thu Jul 17 11:40:27 CST 2014

System load: 0.06 Processes: 200

Usage of /: 38.3% of 454.39GB Users logged in: 0

Memory usage: 30% IP address for eth0: 192.168.1.188

Swap usage: 0%

Graph this data and manage this system at:

https://landscape.canonical.com/

Welcome to Ubuntu 14.04 LTS (GNU/Linux 3.13.0-32-generic x86_64)

* Documentation: https://help.ubuntu.com/

System information as of Thu Jul 17 14:21:05 CST 2014

System load: 0.05 Processes: 198

Usage of /: 38.3% of 454.39GB Users logged in: 0

Memory usage: 33% IP address for eth0: 192.168.1.188

Swap usage: 0%

Graph this data and manage this system at:

https://landscape.canonical.com/

No mail.

Last login: Thu Jul 17 11:40:28 2014 from 192.168.1.39

mz@s406ok988:~$

但是我查了一下motd(软连接到/var/run/motd)是没问题的

mz@s406ok988:~$ ll /etc/motd

lrwxrwxrwx 1 root root 21 7月 17 11:34 /etc/motd -> /var/run/motd.dynamic

mz@s406ok988:~$ cat /etc/motd

Welcome to Ubuntu 14.04 LTS (GNU/Linux 3.13.0-32-generic x86_64)

* Documentation: https://help.ubuntu.com/

System information as of Thu Jul 17 14:21:05 CST 2014

System load: 0.05 Processes: 198

Usage of /: 38.3% of 454.39GB Users logged in: 0

Memory usage: 33% IP address for eth0: 192.168.1.188

Swap usage: 0%

Graph this data and manage this system at:

https://landscape.canonical.com/

mz@s406ok988:~$ run-parts /etc/update-motd.d/

Welcome to Ubuntu 14.04 LTS (GNU/Linux 3.13.0-32-generic x86_64)

* Documentation: https://help.ubuntu.com/

System information as of 2014年 07月 17日 星期四 14:25:12 CST

System load: 0.0 Processes: 199

Usage of /: 38.3% of 454.39GB Users logged in: 1

Memory usage: 33% IP address for eth0: 192.168.1.188

Swap usage: 0%

Graph this data and manage this system at:

https://landscape.canonical.com/

mz@s406ok988:~$

可以看到motd的内容是没问题的，并且试了下run-parts，显示输出也对。

mz@s406ok988:~$ run-parts /etc/update-motd.d/

Welcome to Ubuntu 14.04 LTS (GNU/Linux 3.13.0-32-generic x86_64)

* Documentation: https://help.ubuntu.com/

System information as of 2014年 07月 17日 星期四 14:25:12 CST

System load: 0.0 Processes: 199

Usage of /: 38.3% of 454.39GB Users logged in: 1

Memory usage: 33% IP address for eth0: 192.168.1.188

Swap usage: 0%

Graph this data and manage this system at:

https://landscape.canonical.com/

mz@s406ok988:~$

不明白为什么登录的时候motd被打印了两次。同样的线上服务器，也是这么配置的，但是有的服务器正常，有的服务器也出现了motd被打印两次，不知道怎么回事