No Space Left on Device
The entire application stack just crashed. No space left on device.
The Scenario
A SaaS platform's primary server has run out of disk space. The database can't write, application logs are failing, and even SSH is barely working. You need to find what consumed all the disk space, clean it up safely without losing data, and prevent it from happening again.
What You'll Learn
Using df, du, and ncdu to diagnose disk space issues
Identifying log rotation failures and runaway file growth
Safely cleaning disk space on a production server
Setting up disk usage alerts and automatic cleanup policies
Tools You'll Use
Real-World Context
GitLab's famous 2017 outage started with disk space issues. Disk full errors are the 'check engine light' of infrastructure - simple to prevent, catastrophic to ignore.
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