Docker Compose para postgresql

docker-compose.yml

version: "3"
services:
#  Create a service named db.
  db:
#   Use the Docker Image postgres. This will pull the newest release.
    image: "postgres"
#   Give the container the name my_postgres. You can changes to something else.
    container_name: "demo_uno_postgres"
#   Setup the username, password, and database name. You can changes these values.
    environment:
      - POSTGRES_USER=u_demo
      - POSTGRES_PASSWORD=pwd0123456789
      - POSTGRES_DB=db_demo_uno
#   Maps port 54320 (localhost) to port 5432 on the container. You can change the ports to fix your needs.
    ports:
      - "5432:5432"
#   Set a volume some that database is not lost after shutting down the container.
#   I used the name postgres-data but you can changed it to something else.
    volumes:
      - ./postgres-data:/var/lib/postgresql/data