21 Jan 2021
I didn’t know about the
~/.ssh/config file until quite recently and it’s really handy, so I thought I’d share.
~/.ssh/config lets you make what I think of as ssh aliases. You can give connections short names and specify various connection settings ‒ pretty much anything you can pass to ssh’s CLI can be configured here.
Here’s a simple example:
Host nas Hostname 192.168.1.10 Host laptop Hostname 192.168.1.11 User laptop-me Host someserver Hostname 203.0.113.1 User seriousthings Port 10100 PubkeyAuthentication yes Identityfile ~/.ssh/id_rsa_seriousthings Host * PubkeyAuthentication no
I am then able to do, for example, simply:
These settings apply from top to bottom, cumulatively. So you want to structure this file with specific rules above general rules, otherwise the general rules will override the specific, which is not what you want.
One nice benefit is that you’ll get autocompletion of hosts defined in
~/.ssh/config when using ssh under bash or zsh (at least).
~/.ssh/config can also be used to shore up some of the leaky parts of sshing, as described at the link below ‒ the whole page, and other articles in the series (linked at the top) are worth a read if you use ssh a decent amount.
ssh tunnelling for fun and profit