Server admin
Inspect simulated processes, services, and web server config like a cautious admin.
Understand the pattern
Inspection prevents blind service changes.
ps- Inspect a bounded snapshot of simulated processes.
A process being present does not prove that its service can handle requests.
systemctl- Inspect or change a simulated systemd service. Status, active state, and unit configuration reveal different evidence.
A service can be active while an application endpoint is unhealthy; verify both layers.
cat- Read one or more files to standard output without editing their contents.
Reading a source file should precede changing it; avoid printing real secrets.
Worked example and expected result
$ psPID USER COMMAND 1 root systemd --simulated 42 www-data nginx: static process 77 root sshd: listener 108 learner clairos-learn-terminal 126 root cron
Exit status: 0. The command completed successfully in the training fixture.
$ systemctl status nginxnginx.service - simulated nginx Loaded: loaded Active: active Notes: serving the simulated static learn site
Exit status: 0. The command completed successfully in the training fixture.
$ cat /etc/nginx/sites-available/learn.confserver {
listen 443 ssl;
server_name learn.clairos.ai;
root /srv/www;
location ^~ /api/learn/ { proxy_pass http://127.0.0.1:8010; }
location ^~ /api/ { return 404; }
add_header Content-Security-Policy "default-src 'self'; connect-src 'self'" always;
# training config only
}Exit status: 0. The command completed successfully in the training fixture.
Explain it
Apply it elsewhere
Keep the momentum.
Complete the lab, then explain and apply the pattern.
Next: Service inspectionTry an incident drillAnonymous lesson and mastery progress lasts for this session. Sign in to keep synced lesson XP between sessions; mastery stays device-local. No speed bonus, lost lives, or hint penalties.