database_scaling_patterns/simulate_database_sharding/docker-compose.yml at main · khofesh/database_scaling_patterns · GitHub

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services:
  # Shard 1 - Users with ID hash % 3 == 0
  postgres_shard1:
    image: postgres:18-bookworm
    container_name: shard1_postgres
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: shard_db
    ports:
      - "5433:5432"
    volumes:
      - shard1_data:/var/lib/postgresql
      - ./init/shard1:/docker-entrypoint-initdb.d
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 5s
      retries: 5

  # Shard 2 - Users with ID hash % 3 == 1
  postgres_shard2:
    image: postgres:18-bookworm
    container_name: shard2_postgres
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: shard_db
    ports:
      - "5434:5432"
    volumes:
      - shard2_data:/var/lib/postgresql
      - ./init/shard2:/docker-entrypoint-initdb.d
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 5s
      retries: 5

  # Shard 3 - Users with ID hash % 3 == 2
  postgres_shard3:
    image: postgres:18-bookworm
    container_name: shard3_postgres
    environment:
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
      POSTGRES_DB: shard_db
    ports:
      - "5435:5432"
    volumes:
      - shard3_data:/var/lib/postgresql
      - ./init/shard3:/docker-entrypoint-initdb.d
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 5s
      retries: 5

volumes:
  shard1_data:
  shard2_data:
  shard3_data: