Configure computer to use multiple ssh keys for same service

multiple-ssh.md

Configure multiple ssh keys on machine

For this project i will use github as example. I have two keys id_rsa and personal_rsa.

First of all you need to create file ~/.ssh/config. Inside the file put content as follow and edit as your need

# Default configuration (ask for password if there's no key in config file)
Host *
IdentitiesOnly yes

# personal_rsa
Host personal.com
HostName github.com
User git
AddKeysToAgent yes
IdentityFile ~/.ssh/personal_rsa

# id_rsa
Host github.com
HostName github.com
User git
AddKeysToAgent yes
IdentityFile ~/.ssh/id_rsa

In the repos where you want to use key personal_rsa edit the ssh remote url and replace Hostname by Host, for example:

Original Repo Url: git@github.com:my-repo.git
Url To use personal_rsa: git@personal.com:my-repo.git

When you want to use id_rsa key you can just keep the original repo url, because Host and HostName are the same in config.

you can do this for any ssh service.