Bits of .NET

🌐 Containers Need to Communicate

Default bridge works. Different network modes suit different needs. Bridge (default), Host (no isolation), None (isolated).

📝 Network Modes

Bridge (default):
- Container gets private IP
- Access via port mapping (-p 80:8080)
- Good for most containers

Host:
- Container uses host network stack
- No port mapping needed
- Performance (no NAT)
- Security risk (no isolation)

None:
- No network access
- Completely isolated
- For offline processing

Container:
- Share network with another container
- Use same IP
- Good for sidecar patterns

🎯 Examples

# Bridge (default)
docker run -d --name web -p 80:8080 nginx

# Host (no isolation)
docker run -d --name web --network host nginx

# None (isolated)
docker run -d --name offline --network none alpine sleep 1000

# Container (share network)
docker run -d --name redis redis
docker run -d --name app --network container:redis node app

# Create custom bridge network
docker network create mynet
docker run -d --network mynet --name db postgres
docker run -d --network mynet --name app myapp

💡 When to Use Which

• Bridge: Most use cases, default
• Host: High-performance, but less secure
• None: Security-sensitive, offline processing
• Container: Sidecar, proxy, service mesh
• Custom bridge: Better isolation, container name resolution