SSH

Overview

SSH (Secure Shell) provides encrypted remote access to servers. Beyond basic login, it handles key-based auth, port forwarding (tunnels), jump hosts (bastion), file transfer (SCP/SFTP), and agent forwarding.

Instructions

Step 1: Key Setup

# Generate ED25519 key (recommended over RSA)
ssh-keygen -t ed25519 -C "your@email.com"

# Copy public key to server
ssh-copy-id user@server.example.com

# Or manually:
cat ~/.ssh/id_ed25519.pub | ssh user@server "mkdir -p ~/.ssh && cat >> ~/.ssh/authorized_keys"