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Reference: Multiple SSH Keys settings for different github account & How to Work with GitHub and Multiple Accounts

Generating a new SSH key and adding it to the ssh-agent

-t rsa Specifies the type of key you are creating, in this instance is an RSA key
-C email@email.com This puts a comment at the end of your public key so its easier to see which key is yours

> ssh-keygen -t rsa -C "email@email.com"
> Enter file in which to save the key (/Users/USERNAME/.ssh/KEY_NAME):
> Enter passphrase (empty for no passphrase):

ssh-add

The ssh-add command prompts the user for a private key password and adds it to the list maintained by ssh-agent. Once you add a password to ssh-agent, you will not be prompted for it when using SSH or scp to connect to hosts with your public key.

> ssh-add ~/.ssh/KEY_NAME #without the .pub

Adding to the ssh config file

Open ~/.ssh/config to create new ssh config entries.

Host server-name
    HostName sub.server-name.com
    User username
    IdentitiesOnly yes
    IdentityFile ~/.ssh/id_rsa

now you can ssh into server-name with new config entry

> ssh server-name

The alternative is to use ssh command that includes this info. ssh -i ~/.ssh/some.pem username@sub.server-name.com -i option should point to identity_file.

to use multiple accounts on github

Replace USERNAME with your GitHub usernames

Host github.com-USERNAME
    HostName github.com
    User USERNAME
    IdentityFile ~/.ssh/KEY_NAME.pub

update get remote url

> git remote get-url origin
git@github.com-<USERNAME>/digital-ocean.git

> git remote set-url origin git@github.com-<USERNAME>:<REPO>/digital-ocean.git
git@github.com-<USERNAME>:<REPO>/digital-ocean.git