I am running Spring Boot 3.3. and Docker. I my app can successfully access the Postgres database using the config below.

Question

How can I configure this so that the I can access the Posrgres database from outside the Docker Container?

My DBeaver client can connect, but I cannot seem to query the table in the database, using the following url:

jdbc:postgresql://localhost:5431/expiry_service_db

docker-compose.yml

version: '1.0'
services:
  app:
    image: 'docker-spring-boot-postgres:latest'
    build:
      context: .
      dockerfile: Dockerfile
    container_name: app
    ports:
      - "8081:8080"
    #network_mode: host
    depends_on:
      - db
    environment:
      - SPRING_PROFILES_ACTIVE=dev
      - SPRING_DATASOURCE_URL=jdbc:postgresql://db:5432/expiry_service_db
      - SPRING_DATASOURCE_USERNAME=postgres
      - SPRING_DATASOURCE_PASSWORD=postgres
      - SPRING_JPA_HIBERNATE_DDL_AUTO=update
  db:
    image: postgres:latest
    container_name: db
    restart: always
    environment:
      - POSTGRES_DB=expiry_service_db
      - POSTGRES_PASSWORD=postgres
      - POSTGRES_USER=postgres
    ports:
      - "5431:5432"
    #network_mode: host
    volumes:
      - postgres_data:/var/lib/postgresql

volumes:
  postgres_data: