I’ve always just worked with one GitHub account (my personal one), and then came octopress. I wanted to convert all the sites I manage from WordPress to octopress. Everything went well until running rake deploy.
Step 1: Create a new SSH key
I had to generate a new SSH key for the second GitHub account.
ssh-keygen -t rsa -C "your-email-address"
Be sure not to over-write your existing key (~/.ssh/id_rsa). I named mine id_rsa_ACCOUNT.
Step 2: Attach the new key to the GitHub Account.
I’m not going to go into any details here, it should be pretty obvious what you need to do.
Step 3: Create a config file
This config file is where all the magic happens. This is what allows you to specify which account to use when pushing things to GitHub.
touch ~/.ssh/config vim ~/.ssh/config
Add the following to the file
Host github.com HostName github.com User git IdentityFile ~/.ssh/id_rsa Host github-ACCOUNT HostName github.com User git IdentityFile ~/.ssh/id_rsa_ACCOUNT
Now when pushing to your different accounts you can specify which one.
git remote add origin git@github-ACCOUNT:username/repo.git git push origin master