Setting Up SSH Keys on Debian/Ubuntu Print

SSH keys provide a secure way to log in to your Linux server without using a password.

Generate SSH Key Pair

1. Open terminal
2. Run this command:

   ssh-keygen -t ed25519 -C "your_email@example.com"

3. Press Enter to save the key in the default location
4. Enter a passphrase (recommended) or leave empty

Copy Public Key to Server

Use either method:

Method 1: ssh-copy-id

ssh-copy-id username@server_ip

Method 2: Manual copy

1. View your public key:

   cat ~/.ssh/id_ed25519.pub

2. Connect to your server:

   ssh username@server_ip

3. Create SSH directory:

   mkdir -p ~/.ssh
   chmod 700 ~/.ssh

4. Add your key:

   echo "public_key_string" >> ~/.ssh/authorized_keys
   chmod 600 ~/.ssh/authorized_keys

Test Connection

ssh username@server_ip

You should connect without needing a password.