Run ssh -G lab.
ssh -G lab
Mission 139
Auth config checkpoint
Review SSH, identity, firewall, and notes.
Security administrationsshssh-keygenufwecho
Lesson 139 of 360
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Security administration · 8 minutes
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learner@clairos:/home/learner $
Unix ops lab: type a command, press Enter
Instructions
8 minutes
Click any instruction for the command details, the why, and the common mistake to avoid.
Run ssh-keygen -lf ~/.ssh/authorized_keys.
ssh-keygen -lf ~/.ssh/authorized_keys
Run ufw status verbose.
ufw status verbose
Run echo auth-reviewed > lab/auth-review.txt.
echo auth-reviewed > lab/auth-review.txt
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Lesson support
What to notice while you play.
Review SSH, identity, firewall, and notes.
Run the commands in order and compare the outputs.
Junior operators build confidence by gathering evidence before changing systems.
- Skipping the inspection step.
- Assuming one command tells the whole story.
Reference
Commands in this lesson.
echo <text>
Print text or write lab notes with >.
ssh|scp|ssh-keygen
Practice SSH inspection and dry-run transfer shapes without network access.
ufw status
Inspect simulated firewall rules.