Free course

SSH Course

Use SSH safely for remote access, host verification, keys, file transfer, tunnels, jump hosts, automation, and recovery.

5 modules · 25 lessons · No signup

Prerequisites: Shell Commands and Linux Basics

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What you'll learn

Create and operate a verified path to an Ubuntu server with personal keys, narrow tunnels and automation, rotation, and a tested recovery runbook.

Course contents

  1. Connections and trust

    Understand the handshake, verify host identity, and diagnose explicit connections.

    1. ✓ Understand the SSH connection
    2. ✓ Verify the host key
    3. ✓ Understand known_hosts
    4. ✓ Connect with explicit options
    5. ✓ Check your understanding: connections and trust

  2. Keys, agent, and config

    Create protected identities, install public keys, and write maintainable client config.

    1. ✓ Generate a dedicated key
    2. ✓ Protect private keys and use the agent
    3. ✓ Install and restrict public keys
    4. ✓ Write maintainable SSH config
    5. ✓ Check your understanding: keys, agent, and config

  3. Files, tunnels, and jumps

    Run commands, transfer files, forward ports, and cross bastions safely.

    1. ✓ Run remote commands
    2. ✓ Transfer files with scp and sftp
    3. ✓ Create local and remote tunnels
    4. ✓ Use jump hosts without spreading keys
    5. ✓ Check your understanding: files, tunnels, and jumps

  4. Server access and hardening

    Use personal accounts, change sshd safely, reduce exposure, and read logs.

    1. ✓ Use personal accounts and sudo
    2. ✓ Change sshd configuration safely
    3. ✓ Reduce authentication and network exposure
    4. ✓ Read SSH logs and failures
    5. ✓ Check your understanding: server access and hardening

  5. Automation, rotation, and recovery

    Build narrow automation, rotate and revoke keys, respond, and rehearse recovery.

    1. ✓ Build narrow automation
    2. ✓ Rotate and revoke keys
    3. ✓ Respond to a lost key or host change
    4. ✓ Finish the operator runbook
    5. ✓ Check your understanding: automation, rotation, and recovery