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Using multiple github accounts with ssh keys

Problem

I have two Github accounts: oanhnn (personal) and superman (for work). I want to use both accounts on same computer (without typing password everytime, when doing git push or pull).

Solution

Use ssh keys and define host aliases in ssh config file (each alias for an account).

How to?

  1. Generate ssh key pairs for accounts and add them to GitHub accounts.

  2. Edit/Create ssh config file (~/.ssh/config):

    # Default github account: oanhnn
    Host github.com
       HostName github.com
       IdentityFile ~/.ssh/oanhnn_private_key
       IdentitiesOnly yes
       
    # Other github account: superman
    Host github-superman
       HostName github.com
       IdentityFile ~/.ssh/superman_private_key
       IdentitiesOnly yes
    

    NOTE: If you use any account frequently, you should use the default hostname (github.com).

  3. Add ssh private keys to your agent:

    $ ssh-add ~/.ssh/oanhnn_private_key
    $ ssh-add ~/.ssh/superman_private_key
  4. Test your connection

    $ ssh-keyscan github.com >> ~/.ssh/known_hosts
    $ ssh -T git@github.com
    $ ssh -T git@github-superman

    If everything is OK, you will see these messages:

    Hi oanhnn! You've successfully authenticated, but GitHub does not provide shell access.
    Hi superman! You've successfully authenticated, but GitHub does not provide shell access.
  5. Now all are set, you need remeber

    git@github-superman:org/project.git => user is superman
    git@github.com:org/project.git.     => user is oanhnn
    
  • If you need clone a repository, just do:
$ git clone git@github-superman:org1/project1.git /path/to/project1
$ cd /path/to/project1
$ git config user.email "superman@example.com"
$ git config user.name  "Super Man"
  • If you already have the repo set up, after the ssh config instructions, you need change the URL of origin, just do:
$ cd /path/to/project2
$ git remote set-url origin git@github-superman:org2/project2.git
$ git config user.email "superman@example.com"
$ git config user.name  "Super Man"
  • If you are creating a new repository on local:
$ cd /path/to/project3
$ git init
$ git remote add origin git@github-superman:org3/project3.git
$ git config user.email "superman@example.com"
$ git config user.name  "Super Man"
$ git add .
$ git commit -m "Initial commit"
$ git push -u origin master

Done! Goodluck!

Addon:

The bash script that prompts for your git account. Thank @davorpa

#!/bin/bash

# silent prompt
read -p 'GIT profile: ' profile

# switch
case $profile in
  superman)
    git config user.email "superman@example.com"
    git config user.name "superman" 
    git config user.signingKey "superman_gpg_public_key"
    ;;
  oanhnn)
    git config user.email "oanhnn@example.com"
    git config user.name "oanhnn" 
    git config user.signingKey "oanhnn_gpg_public_key"
    ;;
  # default case: raise error
  *)
    >&2 echo "ERR: Unknown profile: $profile"
    exit 1
esac
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