於 ubuntu 上安裝 rhc (OpenShift)平台操作工具

參考網站:
https://developers.openshift.com/getting-started/debian-ubuntu.html#client-tools

可能遇到的錯誤與解法:
root@host:~# gem install rhc
ERROR: Error installing rhc:
net-ssh requires Ruby version >= 2.0.
root@host:~# gem install net-ssh -v 2.9.2
Fetching: net-ssh-2.9.2.gem (100%)
Successfully installed net-ssh-2.9.2
1 gem installed
Installing ri documentation for net-ssh-2.9.2…
Installing RDoc documentation for net-ssh-2.9.2…
root@host:~#