登录学习：SSH在登录主机后如何显示基础信息

sudo apt-get install landscape-common

sudo apt-get install update-notifier-common

Welcome to Ubuntu 16.04.2 LTS (GNU/Linux 4.4.0-74-generic x86_64)
 * Documentation: https://help.ubuntu.com
 * Management:  https://landscape.canonical.com
 * Support:  https://ubuntu.com/advantage
 System information as of Mon Apr 24 11:20:30 CST 2017
 System load: 0.08    Users logged in:  0
 Usage of /: 44.2% of 39.25GB IP address for eth0: X.X.X.X
 Memory usage: 80%    IP address for eth1: X.X.X.X
 Swap usage: 0%     IP address for docker0: X.X.X.X
 Processes: 109
 Graph this data and manage this system at:
 https://landscape.canonical.com/
8 packages can be updated.
0 updates are security updates.

Welcome to aliyun Elastic Compute Service!