how to setup multiple github ssh keys

1. create multiple ssh key

ssh-keygen -t rsa -C "your_email@youremail.com"

for example, 2 keys create at:

~/.ssh/id_rsa
~/.ssh/id_rsa_sli_racingwithhorse

2. then, add these two keys as following

ssh-add ~/.ssh/id_rsa
ssh-add ~/.ssh/id_rsa_sli_racingwithhorse

check your saved keys using:

ssh-add -l

3. modify the ssh config

cd ~/.ssh/
touch config

$==> cat config
#gmail.com account
Host github.com
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa

#racingwithhorse account
Host github.com-racingwithhorse
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_sli_racingwithhorse

4. clone you repo and modify your git config

git config user.name "racingwithhorse"
git config user.email "xxx@xxx.xxx"

then inside the cloned git repository

cat .git/config
[remote "origin"]
	url = git@github.com-racingwithhorse:racingwithhorse/racingwithhorse.github.io.git
	fetch = +refs/heads/*:refs/remotes/origin/*

That’s it!