2020-10-14

SSH

• 工作上需要經過兩層跳板機才能存取到 AWS EMR，先前使用 .ssh\config 裡面的 ProxyCommand，但跳板機的設定比較嚴，研究了一下解法，除了靠 ssh -J userA@跳板機A,userB@跳板機B userC@目的機 以外，也可以使用 .ssh\config 裡的 ProxyJump
• manpage 說明: man ssh_config

  ProxyJump
               Specifies one or more jump proxies as either [user@]host[:port] or an ssh URI.  Multiple proxies may be
               separated by comma characters and will be visited sequentially.  Setting this option will cause ssh(1)
               to connect to the target host by first making a ssh(1) connection to the specified ProxyJump host and
               then establishing a TCP forwarding to the ultimate target from there.
  
               Note that this option will compete with the ProxyCommand option - whichever is specified first will pre-
               vent later instances of the other from taking effect.
  
               Note also that the configuration for the destination host (either supplied via the command-line or the
               configuration file) is not generally applied to jump hosts.  ~/.ssh/config should be used if specific
               configuration is required for jump hosts.