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Images, containers, networks and volumes: Docker problems explained from the runtime up.
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A container stuck in Restarting (1) is a crash loop. Read the exit code, the restart count and the logs of every attempt, then fix the startup, not the policy.
A full Docker host is usually container logs, which docker system df does not count. Find the space with df and du, prune safely, and set log rotation.
A 502 is nginx saying its own connection to the upstream failed. How to read error.log, tell refused from timed out, and test from where nginx stands.
A zombie is a child that has exited but was never reaped by its parent. Why kill -9 does nothing, how to find the parent, and why containers need a PID 1 that reaps.