Using Git With Multiple SSH Keys and Accounts

Generating SSH keys for GitHub

Here are github account and work account.

• GitHub:
  SSH Key: github_id_rsa
  Account: oopsmonk

• Work:
  SSH Key: work_id_rsa
  Account: SamChen

Add SSH config File

Modify ~/.ssh/config

# Default github
Host github.com
    HostName github.com
    PreferredAuthentications publickey
    IdentityFile ~/.ssh/github_id_rsa

# Work git server
Host work.gitserver.com
    HostName work.gitserver.com
    PreferredAuthentications publickey
    IdentityFile ~/.ssh/work_id_rsa

Git Repository Configuation

• GitHub Project:

  $ git clone https://github.com/abc/projectA.git  
  $ cd projectA
  #github account
  $ git config user.name "oopsmonk"
  $ git config user.email "oopsmonk@example.com.tw"

• Working Project:

  $ git clone https://work.com.tw/repo/projectW.git  
  $ cd projectW
  #working account
  $ git config user.name "SamChen"
  $ git config user.email "SamChen@example.com.tw"

Now you can deal with git repositories using different accounts.

(Additional) Using ssh-agent to access GitHub without password

Check key list

# No ssh-agent running 
$ ssh-add -l
Could not open a connection to your authentication agent.
$  

Enable ssh-agent (Ubuntu12.04):

#enable ssh-agent
$ eval `ssh-agent -s`

#add keys to agent
$ cd ~/.ssh
$ ssh-add work_id_rsa github_id_rsa
Identity added: work_id_rsa (work_id_rsa)
Identity added: github_id_rsa (github_id_rsa)

#list added keys
$ ssh-add -L

#delete keys in agent  
$ ssh-add -D

Now you can commit modifications to git repository without password.

Reference:
Understanding ssh-agent and ssh-add
How can I run ssh-add automatically, without password prompt?