docker-compose services.db.ports contains an invalid type, it should be a number, or an object. Post-CodePudding

I am building a Flask application in Python. I'm using SQLAlchemy to connect to PostgreSQL.

I used this to successfully connect my SQLALchemy in the flask app to my postgresql.

engine = create_engine('postgresql://postgres:[mypassword]@localhost:5432/employee-manager-db')

However, I run into an error when I try to do docker-compose up. This is my docker-compose.yml

version: '3.8'
services:
  backend:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - 8000:8000
    volumes:
      - .:/app

    depends_on:
      - db

  db:
    image: postgres:14.5
    restart: always
    expose:
      - '5432'
    volumes:
      - .dbdata:/var/lib/postgresql
    ports:
      - 'db:5432'

I don't know why it is not recognizing db as an object.

Edit: I had the same problem as this (Docker: Is the server running on host "localhost" (::1) and accepting TCP/IP connections on port 5432?) and tried to fix it, but I am currently facing this error instead. Thank you so much for your help

CodePudding user response：

The ports option for a service is a list of <host_port>:<container_port> mappings. Both the <host_port> and <container_port> parts need to be integers, which db is not.

You probably want:

  db:
    image: postgres:14.5
    restart: always
    expose:
      - '5432'
    volumes:
      - .dbdata:/var/lib/postgresql
    ports:
      - '5432:5432'