version: '3.9' services: csharpapp: container_name: csharpapp image: francescoxx/csharpapp:1.0 build: . ports: - "8080:80" environment: ConnectionStrings__DefaultConnection: "Host=db;Database=postgres;Username=postgres;Password=postgres" depends_on: - db db: container_name: db image: postgres:12 ports: - "5432:5432" environment: POSTGRES_PASSWORD: postgres POSTGRES_USER: postgres POSTGRES_DB: postgres volumes: - pgdata:/var/lib/postgresql/data volumes: pgdata: {}