Practise
Black Box Labs
Realistic incident practice without touching production. Investigate with real commands, collect clues, and commit to a diagnosis.
Signature labIntermediate~12 min
The Silent Web Server
A production Linux web server is responding slowly and sometimes timing out. nginx is technically running, but users are complaining. CPU isn't high. Disk usage 'looks normal' at first glance. SSH works. Your job: investigate safely, narrow the uncertainty, identify the root cause, and choose the safest fix — without touching production blindly.
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