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beginner Docker Docker & Containers: From Zero to Production Docker Networking Module 3 — Working with Containers

Container Networking Basics — How Containers Communicate

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AI Summary
R Ram Pothuraju Reading…

What You'll Learn

Beginner

  • How containers get network access
  • How containers communicate with each other
  • Port mapping vs direct container-to-container
bridge Default network Isolated from host Port mapping needed Best for: standalone apps host No isolation Uses host network No port mapping Best for: performance none No networking Loopback only Fully isolated Best for: security overlay Multi-host Swarm / K8s Cross-host DNS Best for: clusters Example: Custom Bridge Network web-app api-server database my-network (DNS resolves names automatically)
Docker network types and a custom bridge network with DNS
Terminalbash
# Create a custom network (has DNS!)
docker network create my-net

# Containers resolve each other by name
docker run -d --name web --network my-net nginx
docker run -d --name api --network my-net node:18

# api can reach web by name:
docker exec api curl -s http://web

Practical Exercise

Create a custom network
Run two containers on it
Test DNS resolution with curl http://web

Key Takeaways

  • Containers get their own IP on the bridge network.
  • -p host:container publishes ports.
  • Custom networks have built-in DNS — containers resolve by name.
  • This is the foundation for Docker Compose.
Previously: Lesson 20 covered copying files.
Today: You learned: How containers get network access and talk to each other.
Next: Lesson 22 covers resource limits.
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