Manage multiple ssh accounts for GitHub and GitLab

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1. Generate new RSA SSH keys

ssh-keygen -t rsa -b 2048 -C "email@example.com"

for example, I have 2 keys in my laptop

~/.ssh/id_rsa
~/.ssh/tpp_rsa

Next, add the new key you just created

ssh-add ~/.ssh/tpp_rsa

You can check your added keys

ssh-add -l

2. Modify the ssh config

nano ~/.ssh/config
# Gitlab Personal
Host gitlab.com
        HostName gitlab.com
        User git
        IdentityFile ~/.ssh/id_rsa

# Gitlab Working
Host gitlab.com-tpp
        HostName gitlab.com
        User git
        IdentityFile ~/.ssh/tpp_rsa

# GitHub Personal
Host github.com
        HostName github.com
        User git
        IdentityFile ~/.ssh/id_rsa

# GitHub Working
Host github.com
        HostName github.com-tpp
        User git
        IdentityFile ~/.ssh/tpp_rsa

3. Test the connection

ssh -T git@gitlab.com
ssh -T git@gitlab.com-tpp
ssh -T git@github.com
ssh -T git@github.com-tpp

4. Add public key to your source control profile setting

Copy the public key to clipboard

cat ~/.ssh/tpp_rsa.pub | xclip -selection c

Paste the key to gitlab ssh setting

Paste the key to github ssh setting

5. Clone the source code using different user

Use this config for your personal account 

git clone git@gitlab.com:myname/myproject.git

For other account 

git clone git@gitlab.com-tpp:orga/projecta.git

That's all! Good luck!