* starter account does not fit all zones 學生帳號只可在三個 zone 上活動
  > three regions that the Starter Accounts can launch services from:
  > US West Oregon,  US East N. Virginia, US East Ohio
* always remember logout on console 主控台離開時一定要登出
* never, NEVER login lab 0 實驗室一旦離開即不能再進入!!
* when necessary may ask teacher to write aws email to relogin lab 0
* use 1st ec2 as base 使用第一個機器當成主要操作台不離開