docker con mysql y phpmyadmin

docker-compose.yml

version: '3'

services:
  # Database
  db:
    image: mysql:5.7
    ports: 
      - '3306:3306'
    volumes:
      - db_data:/var/lib/mysql
    # restart: always
    environment:
      MYSQL_ROOT_PASSWORD: juanra
      MYSQL_DATABASE: mibd
      MYSQL_USER: juanra
      MYSQL_PASSWORD: juanra
    networks:
      - mi-red
  # phpmyadmin
  phpmyadmin:
    depends_on:
      - db
    image: phpmyadmin/phpmyadmin
    # restart: always
    ports:
      - '3000:80'
    environment:
      PMA_HOST: db
      MYSQL_ROOT_PASSWORD: juanra 
    networks:
      - mi-red
  # # Servidor de aplicación
  # ubuntu:
  #   depends_on:
  #     - db
  #   image: ubuntu:20.04
  #   ports:
  #     - '5000:5000'
  #   # restart: always
  #   # command: apt update -y && apt install nodejs npm -y && sleep 72000
  #   command: sleep 72000
  #   volumes: ['./code:/app']
  #   environment:
  #     DB_HOST: db
  #     DB_USER: usuario
  #     DB_PASSWORD: clave
  #     DB_DATABASE: mibd
  #   networks:
  #     - mi-red
networks:
  mi-red:
volumes:
  db_data: