While this is all cool, it has a lot of default things and assumptions behind the scene which you are not bothering to learn until you face a slightly different requirements: assume that you need to have the SSH configuration and per-host keys not in your home. So now as you have all in place and configured, you can ssh private.host and enjoy the stay on your secure server. To get this to work, you would adjust the ~/.ssh/config as follows: Host bastion.host This way bastion.host will know nothing about your keys or anything related to authentication, but will just make a tunnel (similar to SSH port forwarding) and keep it for you until you are done. In this scenario, when configured properly, ssh will first run the Prox圜ommand to establish the connection to bastion.host and then enable the tunnel via this connection to the private.host. The second method to achieve the same functionality in terms of bastion host and avoid messing around ssh-agent is to use SSH Prox圜ommand. Running ForwardAgent requires you to actually configure and run ssh-agent on you local PC/laptop, which is not a big deal at all, but you will have to remember and check it all the time or you will have all kind of authentication errors and will spend sometime to find out the reason for them (not running/misconfigured agent.Running ForwardAgent is not a good idea in terms of security, and you can read more about it here.Prox圜ommand ssh -q -A bastion.host -W %h:%pĪnd while this is all cool from one point of view, this method has few drawbacks: The one and the most commonly used is with SSH Agent forwarding, meaning you have to run ssh-agent on you laptop, add the SSH keys to it via ssh-add command (or use ssh-add -L to list all keys in the agent) and then user ForwardAgent yes in ~/.ssh/config, something like this: Host bastion.host While I am not going to talk about actual advantages of bastion hosts, I will put here some clarifications on the SSH client setup.Īssuming you you a bastion.host that you user as a connection gateway to your private.host and you want to work with your default SSH key that is only on your local PC/laptop, you have two possible way. While it is pretty common to have an infrastructure behind load-balancers and bastion hosts, there are still many confusion around actual configuration of the SSH client for fast and convenient use of the setup.
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