How to copy the new public key?

To copy the new public key to the target system, you can use the ssh-copy-id command or manually append it to the authorized_keys file. Here are both methods:

Method 1: Using ssh-copy-id

1. Run the following command:

   ssh-copy-id username@target_host

   Replace username with your username on the target system and target_host with the IP address or hostname of the target system.

2. Enter your password when prompted. This command will automatically copy your public key to the authorized_keys file on the target system.

Method 2: Manually Copying the Public Key

1. Display your public key:

   cat ~/.ssh/id_rsa.pub

2. Copy the output of the public key.

3. SSH into the target system:

   ssh username@target_host

4. On the target system, open or create the authorized_keys file:

   mkdir -p ~/.ssh
   nano ~/.ssh/authorized_keys

5. Paste the public key into the authorized_keys file. Save and exit the editor.

6. Set the correct permissions for the authorized_keys file:

   chmod 600 ~/.ssh/authorized_keys

After completing these steps, you should be able to SSH into the target system without needing to enter a password.