203 — Docker Networking Fundamentals

Master Docker networking: bridge networks, container communication, port publishing, DNS resolution, and network isolation for microservices.

Learning Objectives

Understand Docker network drivers

Create and manage custom networks

Enable container-to-container communication

Use DNS for service discovery

Implement network isolation

Step 1

Understanding Docker network drivers

Learn about the different network types Docker provides.

Commands to Run

docker network ls

docker network inspect bridge

What This Does

Docker creates three networks by default: bridge (default for containers), host (shares host network), and none (no networking). Each serves different use cases.

Expected Outcome

You'll see the default networks. Inspect shows bridge network details including subnet, gateway, and connected containers.

Pro Tips

1
bridge: Default, provides isolation and internal network
2
host: Container uses host's network directly (no isolation)
3
none: No networking, complete isolation
4
Custom networks provide better DNS and isolation than default bridge