BENINCOSAArmchair Notes

An old man’s take on tech, systems, and trying to make sense of the world.

Technology

Jumphost SSH config

By Vallard BenincosaJune 14, 20161 min read
Oh, you have a jumphost? And then you want to get to another server that is behind that server on a private network?  If both servers are configured with the same key this can be accomplished by putting an SSH config file entry like the one below: 
Host jump.amster
  User cloud-user
  IdentityFile ~/.ssh/amsterdam-blockchain.pem
  Hostname 173.63.1.2
Host amster
  User cloud-user
  IdentityFile ~/.ssh/amsterdam-blockchain.pem
  Hostname 10.0.0.6
  ProxyCommand ssh  -W %h:%p jump.amster
To get to the amster server I now just run: 
ssh amster
It runs through the jump.amster server and instant access.