Clairos Learn Interactive UNIX, Web, and AI Operations lessons for practical technical skills
Sandbox

Mess around in the training server.

Use the same lab filesystem from the lessons. Create notes, edit with nano, inspect logs, check simulated services, and reset any time.

Track progress 0/360 lessons 0/17 missions 12 courses
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Ops lab terminal Training lab
New learnerrank 0XP 0%complete
learner@clairos:/home/learner $ Unix ops lab: type a command, press Enter
Sandbox prompts
  • Use pwd, ls /, and cat /etc/hostname to map the training server.
  • Create a new folder named lab and use nano lab/incident-notes.txt to save a note.
  • Use tail -n 3 /var/log/auth.log, then grep denied /var/log/auth.log.
  • Run ps and systemctl status nginx to inspect the simulated service layer.
  • Run whoami, id, groups, and ufw status to practice security inspection.
  • Run nginx -t, df -h, free -h, and uptime to inspect training operations health.
  • Try echo alpha beta beta | wc to practice a safe pipeline.
Mission board
Map the server

Find your location, list root, and read the training hostname.

80 XP
Build a runbook

Create a lab note, edit it with nano, then read it back.

120 XP
Investigate logs

Tail the auth log and search for denied login attempts.

110 XP
Service check

Inspect training processes and nginx service status.

100 XP
Security posture

Check identity, firewall status, and simulated sudo boundaries.

130 XP
Validate nginx

Read the training site config, search /api/, and run nginx -t.

120 XP
Pipeline practice

Use a safe text pipe and write one local note with redirection.

110 XP
Terminal checkpoint

Confirm path, host, system label, and history.

180 XP
Filesystem checkpoint

Create an archive, list it, hash a file, and search paths.

200 XP
Text pipeline checkpoint

Filter, extract, transform, and count text.

220 XP
Editing checkpoint

Create and verify an operator runbook.

210 XP
Permissions checkpoint

Review SSH key mode, group, and path type.

220 XP
Operations checkpoint

Review process, service, log, and disk signals.

230 XP
Security checkpoint

Resolve SSH config, fingerprint a key, and review firewall state.

240 XP
Shell checkpoint

Use test, tee, chmod, and stat like a script reviewer.

230 XP
Networking checkpoint

Tie addresses, listeners, firewall, and SSH together.

230 XP
Final operator check

Write and hash the final junior-operator marker.

300 XP