错误：Django 通过 Docker 连接到 PostgreSQL

Question

我的settings.py代码

   DATABASES = {
         'default': {
         'ENGINE': 'django.db.backends.postgresql',
         'NAME': 'postgres',
         'USER': 'postgres',
         'PASSWORD': 'postgres',
         'HOST': 'db',
         'PORT': 5432
         }
   }

Dockerfile

   # Pull base image
   FROM python:3.8
   # Set environment variables
   ENV PYTHONDONTWRITEBYTECODE 1
   ENV PYTHONUNBUFFERED 1
   # Set work directory
   WORKDIR /code
   # Install dependencies
   COPY Pipfile Pipfile.lock /code/
   RUN pip install pipenv && pipenv install --system
   # Copy project
   COPY . /code/

docker-compose.yml

  version: '3.8'
  services:
   web:
    build: .
    command: python /code/manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - 8000:8000
    depends_on:
      - db
   db:
    image: postgres:11

当 docker-compose 登录 cmd 时，我看到一个错误

  db_1   | Error: Database is uninitialized and superuser password is not specified.
  db_1   |        You must specify POSTGRES_PASSWORD to a non-empty value for the
  db_1   |        superuser. For example, "-e POSTGRES_PASSWORD=password" on "docker run".
  db_1   |
  db_1   |        You may also use "POSTGRES_HOST_AUTH_METHOD=trust" to allow all
  db_1   |        connections without a password. This is *not* recommended.
  db_1   |
  db_1   |        See PostgreSQL documentation about "trust":
  db_1   |        https://www.postgresql.org/docs/current/auth-trust.html

如果我使用带有 sqlite3 的基本settings.py它可以工作并连接到服务器

所以我是Docker上的新人，怎么解决？ 感谢您的回答

这是对我做的

docker-compose.yml（已编辑）

  version: '3.8'
  services:
   web:
    build: .
    command: python /code/manage.py runserver 0.0.0.0:8000
    volumes:
     - .:/code
    ports:
     - 8000:8000
    depends_on:
     - db
   db:
    image: postgres:11
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
      - POSTGRES_DB=postgres
    volumes:
      - postgres_data:/var/lib/postgresql/data/

  volumes:
   postgres_data:

  

Answer 1

使用环境变量初始化您的 postgres 容器：

  db:
      image: postgres:11
      environment:
          - POSTGRES_USER=example
          - POSTGRES_PASSWORD=example
          - POSTGRES_DB=example

Answer 2

您必须使用环境变量POSTGRES_PASSWORD设置PostgreSQL的密码。

如果要禁用密码要求，可以通过将POSTGRES_PASSWORD: [your_password]替换为POSTGRES_HOST_AUTH_METHOD: trust来实现。

job:
  build:
    docker:
      - image: circleci/postgres:9.6
        environment:
          #...
          POSTGRES_HOST_AUTH_METHOD: trust
          #...