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Troubleshooting articles

Guides, benchmarks and product news on troubleshooting from the Karizanta engineering team.

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Aug 19, 2026 Troubleshooting

Docker ate your disk: which of the four caches is full, and how to reclaim it safely

Your host is at 100% and /var/lib/docker is enormous. This walks through reading docker system df, what prune touches and skips, the log file that fills the disk silently, and the exact order to run cleanup on a box already out of space.

Aug 17, 2026 Troubleshooting

Your container runs but the port is unreachable: the four places it breaks

A running container with an unreachable published port has four separate causes, and they produce nearly identical symptoms in a browser. Here is the diagnosis order using docker port, ss on the host and inside the namespace, and iptables -t nat -L DOCKER — and why ufw deny lies to you.