Let's walk through the full steps to generate a new personal_rsa key for your personal projects (if it doesn't already exist), set up the SSH configuration for both accounts, and smoothly switch between them.

Step 1: Check for Existing SSH Keys

First, let's check if you already have a personal SSH key, such as personal_rsa or id_rsa.

Run this command to list the SSH keys in your ~/.ssh/ directory:

ls ~/.ssh/

You should see files named something like id_rsa, id_rsa.pub, personal_rsa, personal_rsa.pub, or fullstackmaster.

• If you see personal_rsa, you already have a personal key and can skip to Step 3.
• If you don't see personal_rsa, continue to the next step to generate it.

Step 2: Generate a New SSH Key (personal_rsa)

If you don’t have an SSH key for your personal projects, you can generate one as follows:

1. Run the following command to generate a new SSH key pair named personal_rsa:

   ssh-keygen -t rsa -b 4096 -C "[email protected]"

2. When asked where to save the key, type the following path:

   /Users/rupesh/.ssh/personal_rsa

3. If prompted for a passphrase, either choose a secure passphrase or press Enter to leave it empty.

After this, your personal_rsa private key and personal_rsa.pub public key will be created in the ~/.ssh/ directory.

Step 3: Add Your SSH Key to the SSH Agent

1. Start the SSH agent if it's not already running:

   eval "$(ssh-agent -s)"

2. Add your new personal_rsa key to the SSH agent:

   ssh-add ~/.ssh/personal_rsa

Step 4: Add Your SSH Key to GitHub

Next, you need to add the newly generated public key (personal_rsa.pub) to your GitHub account.

1. Copy the public key to your clipboard:

   cat ~/.ssh/personal_rsa.pub

2. Go to GitHub SSH and GPG keys settings.

3. Click New SSH Key, give it a descriptive title (e.g., "Personal RSA"), and paste the copied key.

4. Click Add SSH Key.

Step 5: Set Up SSH Config for Multiple Keys

Now that both your fullstackmaster and personal_rsa keys are ready, let’s configure SSH to switch between them automatically based on the repository.

1. Open or create the ~/.ssh/config file using vim:

   vim ~/.ssh/config

2. Add the following configuration for both your fullstackmaster1 and personal GitHub accounts:

   # FullStackMaster GitHub account
   Host github-fullstackmaster
       HostName github.com
       User git
       IdentityFile ~/.ssh/fullstackmaster
   
   # Personal GitHub account
   Host github-personal
       HostName github.com
       User git
       IdentityFile ~/.ssh/personal_rsa

3. Save and exit vim by pressing Esc, then type :wq, and press Enter.

Step 5: Update the Git Remote URLs

You need to ensure the correct remote URLs are set for each repository.

For Professional Repositories:

Update the remote URL for your professional repositories to use the github-fullstackmaster host:

git remote set-url origin git@github-fullstackmaster:FullStackMaster1/repo-name.git

For Personal Repositories:

Update the remote URL for your personal repositories to use the github-personal host:

git remote set-url origin git@github-personal:rupeshtiwari/repo-name.git

Step 6: Test the Configuration

To test the setup, check the SSH connection for both accounts:

FullStackMaster Account:

ssh -T git@github-fullstackmaster

Personal Account:

ssh -T git@github-personal

You should see successful authentication messages for both accounts.

Step 7: Push Code to Respective Accounts

Now, when you push code, Git will automatically use the correct SSH key based on the repository's remote URL.

For professional repositories:

git push origin main

For personal repositories:

git push origin main

By setting up this configuration, you can easily switch between your professional and personal GitHub accounts without manually changing SSH keys.