Docker Bridge Network

# Tạo user-defined bridge network
docker network create \
  --driver bridge \
  --subnet 172.20.0.0/16 \
  --gateway 172.20.0.1 \
  --opt "com.docker.network.bridge.name"="br-custom" \
  my-bridge-network

# Kiểm tra network đã tạo
docker network inspect my-bridge-network

# Chạy container trong custom bridge network
docker run -d \
  --name app-server \
  --network my-bridge-network \
  --ip 172.20.0.10 \
  nginx

# Chạy container thứ hai
docker run -d \
  --name app-db \
  --network my-bridge-network \
  postgres:16

# Kiểm tra kết nối giữa 2 container
docker exec app-server ping -c 3 app-db

# Kết quả: PING app-db (172.20.0.x): OK

# Port mapping: expose container port ra host
docker run -d \
  --name web \
  --network my-bridge-network \
  -p 8080:80 \
  -p 8443:443 \
  nginx

# Container port 80 → Host port 8080
# Container port 443 → Host port 8443
# Truy cập: http://localhost:8080

# docker-compose.yml
version: '3.8'

services:
  web:
    image: nginx:latest
    ports:
      - "8080:80"
    networks:
      - frontend
      - backend

  api:
    image: node:18
    networks:
      - backend

  db:
    image: postgres:16
    networks:
      - backend
    environment:
      POSTGRES_PASSWORD: secret

networks:
  frontend:
    driver: bridge
  backend:
    driver: bridge
    internal: true  # Không truy cập từ bên ngoài