Use different SSH Keys for different Github accounts

multiple_ssh_and_github_setup.md

Multiple SSH Keys settings for different github account

Generate different SSH keys

create different ssh key for work and for personal use

ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519_personal -C "personal@laptop"
ssh-keygen -o -a 100 -t ed25519 -f ~/.ssh/id_ed25519_work -C "work@workstation"

The above commands will create 2 keys:

~/.ssh/id_ed25519_personal
~/.ssh/id_ed25519_work

add the two keys by running

ssh-add ~/.ssh/id_ed25519_personal
ssh-add ~/.ssh/id_ed25519_work

to delete all cached keys before run

ssh-add -D

to list the current saved keys

ssh-add -l

ssh config for multiple Github accounts

update your ~/.ssh/config to include ssh config files from ~/.ssh/config.d/*

# ~/.ssh/config
Include ~/.ssh/config.d/*

create and add a separate ssh config for github

mkdir config ~/.ssh/config.d
edit ~/.ssh/config.d/github

Add

Host github.com-personal
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_ngpersonal

Host github.com-work
  HostName github.com
  User git
  IdentityFile ~/.ssh/id_ed25519_ngwork

Confirm Github can recognize your account id with the right ssh key

ssh -T github.com-personal
Hi <personal-account-name>! You've successfully authenticated, but GitHub does not provide shell access.

ssh -T github.com-work
Hi <work-account-name>! You've successfully authenticated, but GitHub does not provide shell access.

Clone you repo and push commits to confirm access

clone your repo

git clone [email protected]:<personal>/<personal>.git

commit and push

cd <personal>.git
echo "test" > newfile.txt
git add newfile.txt
git commit -m "new file test"
git push 

repeat for "work" account ..