Disk Still Full After Deleting a Log File? Here's the Fix
Deleted a huge log file but df still shows the disk full? A running process still holds it open. Find it with lsof +L1 and free the space safely.
DevOps, visually
Build it. Break it. Fix it.
Clear diagrams and real-world incidents for AWS, Kubernetes, Linux, CI/CD and observability. Learn how systems are built, and how they break.
$ df -h /var
Filesystem Use% Mounted on
/dev/nvme1n1 100% /var
$ du -sh /var
20G /varLatest write-ups
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Compare guides & labs →AWS Architecture, Decoded
A visual AWS guide for your phone: 98 pages, 45+ diagrams and 7 architectures, following one app from a single server to event-driven.
- VPC, EC2, storage, databases and IAM, drawn as diagrams
- 7 architectures, from three-tier to event-driven
- Cloud Practitioner exam map
Full version · From $15
Kubernetes Incident Lab
50 realistic broken clusters on your own laptop. Investigate with your own kubectl; a validator checks the live cluster, so shortcuts don't pass.
- Runs locally on kind: macOS, Linux and Windows (WSL2)
- Tickets arrive with a wrong theory, like real on-call
- Hints, walkthroughs and a production lesson after each fix
Full version · From $39
01
See how it's built
Architectures drawn step by step, from one server to event-driven.
02
See how it breaks
Incidents with the symptom, the wrong first theory and the real cause.
03
Fix it yourself
Hands-on labs that check the live system, so shortcuts don't pass.