Multiple SSH keys for different github accounts

multiple_ssh_setting.md

Multiple SSH Keys settings for different git accounts

This is working for different hosts like github.com & bitbucket.org.

If it is required to manage multiple accounts from the same host like github.com activate the key that is currently required by the following commands (eg. for username_2):

$ ssh-add -D            		//removes all ssh entries from the ssh-agent
$ ssh-add ~/.ssh/id_rsa_username_2      // Adds the relevant ssh key

Found here (step 5): https://www.freecodecamp.org/news/manage-multiple-github-accounts-the-ssh-way-2dadc30ccaca/

create different public key

create ssh key with non default location

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

for example, 2 keys created at:

~/.ssh/id_rsa_username_1
~/.ssh/id_rsa_username_2

then, add these two keys to the ssh agent as following

$ ssh-add ~/.ssh/id_rsa_username_1
$ ssh-add ~/.ssh/id_rsa_username_2

you can delete all cached keys before

$ ssh-add -D

finally, you can check your saved keys

$ ssh-add -l

Modify the ssh config

$ cd ~/.ssh/
$ touch config
$ subl -a config

Note: If ~/.ssh/does not exisit. Run ssh for the first time and it will be created.
https://linuxize.com/post/using-the-ssh-config-file/

Then add

#username_1 account
Host github.com:username_1
	HostName github.com
	User git
	IdentityFile ~/.ssh/id_rsa_username_1

#username_2 account
Host github.com:username_2
	HostName github.com
	User git
	IdentityFile ~/.ssh/id_rsa_username_2

When working on a repository located in another users git account, this should also be registered in the ssh config file. When the ssh URL of the repo looks like this

git@bitbucket.org:different_username/repository_name.git

and your Git account "username_1" is allowed to edit this, it should be configured like this

#different_username account
Host github.com:different_username
	HostName github.com
	User git
	IdentityFile ~/.ssh/id_rsa_username_1

Update SSH keys on GitHub account settings

Visit: https://github.com/settings/keys
Help: https://docs.github.com/en/github/authenticating-to-github/adding-a-new-ssh-key-to-your-github-account

Update SSH keys on Bitbucket account settings

Visit: https://bitbucket.org/account/settings/ssh-keys/
Help: https://support.atlassian.com/bitbucket-cloud/docs/set-up-an-ssh-key/

Clone your repo and adept your Git config

clone your repo

$ git clone git@github.com:username_1/gfs.git gfs_username_2  

cd into repo and modify the local git config

$ git config user.name "username_2"
$ git config user.email "username_2@gmail.com" 

or you can change the global git config

$ git config --global user.name "username_2"
$ git config --global user.email "username_2@gmail.com"

Update origin URLs of repos (optional)

$ git remote set-url origin git@<host>:<username>/<repo>

This is the same as editing your .git/config file.

host-in-ssh-config -> "github.com-username_1"

Then use normal flow to push your code

$ git add .
$ git commit -m "your comments"
$ git push