SSH Basics

# Basic connection
ssh user@hostname
ssh [email protected]

# Specify port
ssh -p 2222 user@hostname

# Use specific key
ssh -i ~/.ssh/id_rsa user@hostname

# Generate RSA key
ssh-keygen -t rsa -b 4096

# Generate Ed25519 key
ssh-keygen -t ed25519

# Specify output file
ssh-keygen -f ~/.ssh/my_key

# Copy public key to server
ssh-copy-id user@hostname

# Set correct permissions
chmod 700 ~/.ssh
chmod 600 ~/.ssh/authorized_keys

# ~/.ssh/config
Host myserver
    HostName 192.168.1.10
    User ubuntu
    Port 22
    IdentityFile ~/.ssh/id_rsa

# Connect using alias
ssh myserver

# Local port forwarding
ssh -L 8080:localhost:80 user@server

# Remote port forwarding
ssh -R 8080:localhost:80 user@server

# Dynamic forwarding
ssh -D 8080 user@server