The original title is "Docker Networking, Demystified: Bridge, Host, and Container DNS"

Short summary

A practical walkthrough of Docker networking covering bridge, host, and container DNS. The key insight is to always use user-defined bridge networks instead of the default bridge, because user-defined networks provide automatic DNS resolution by container name. The article also clarifies the difference between EXPOSE (documentation only) and -p publishing (actual port mapping), with copy-pasteable commands throughout.

• •Always create user-defined bridge networks — the default bridge lacks automatic DNS by container name
• •Containers on the same user-defined network resolve each other by name via Docker's embedded DNS, no hardcoded IPs needed
• •EXPOSE in a Dockerfile is documentation only; -p HOST:CONTAINER is what actually maps ports to the host

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