A quick note on how to use multiple SSH Keys (Identities) on one machine.
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Why would you want to use multiple keys on a machine you ask? There are several reasons, one being perceived security, with contrary opinions and convenience. Using just one Identity makes everything easier and you don’t have to manage several Identities You can read more here and here.
My use case would be that of convenience. I just want to separate work from personal projects and I would like to use a separete key (non-work related) with those projects
ssh-keygen -t rsa -C "firstname.lastname@example.org"
This public key can be in any path, not just in
~/.ssh/ as default/ recommended.
For security, it is recommended that you assign a unique password to this key.
For example, if you have your new key in
~/Documents/ssh_keys/new_key you would need to run
ssh-add ~/Documents/ssh_keys/new_key . If you assigned a password in Setup 1, you will be asked for it.
If you already have entries in your ssh config, just add a new entry at the end of the file. If your file is empty or you didn’t have any before, just add the following.
Host gitlab-diego HostName gitlab.com # or github.com or any other domain User your-username # usually the one you use with that domain IdentityFile path-to-key
With the example data for GitLab and user
diego this entry would look like the following:
Host gitlab-diego HostName gitlab.com User diego IdentityFile ~/Documents/ssh_keys/new_key
To save and close just press
ctrl + o and
ctrl + x to exit
In my case, I wanted to use the new key with GitLab. They have great instructions on how to do that but, for convenience, I list the steps here:
Copy your new key to the clipboard.
pbcopy < path-to-key
Log in into gitlab.com and go to https://gitlab.com/profile/keys
Paste the key into the text box and click on „Add key“
Now you may clone a repository using this new key.