Introduction

• To remotely connect to another computer/server safely.
• Encrypts the connection → nobody can eavesdrop.
• Commonly used to log in to Linux servers from your laptop.

Login

Normal login:

ssh username@server_ip

• Then will be asked for password
• Once connected, can run commands on the VPS as if you were sitting there

SSH Keys (Password-less Login)

Instead of typing password every time, we use SSH keys.

1. Generate SSH key on your local machine:

ssh-keygen -t ed25519 -f deploy_key
# ssh-keygen : cmd to generate a new SSH key pair
#	-t ed25519 → modern type of SSH key algorithm
#	-f deploy_key → custom file name, to save the key in local

1. Get two files on local:
   1. deploy_key → private key, keep secret! 🔒
   2. deploy_key.pub → public key, share to server 🌐
2. Copy public key to VPS:

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