psycopg2.OperationalError：无法连接到服务器：连接被拒绝服务器是否在主机“localhost”上运行[重复]

Question

执行 docker-compose up 时出错。

conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting
TCP/IP connections on port 5433?
could not connect to server: Cannot assign requested address
Is the server running on host "localhost" (::1) and accepting
TCP/IP connections on port 5433?

docker-compose.yml:-

version: '3'

services:
  dcs_web:
    build: .
    depends_on:
      - db
    ports:
      - "5000:5000"
  db:
    image: postgres:latest
    volumes:
      - db-data:/var/lib/postgresql/data
    ports:
      - "5433:5433"
    environment:
      - 'POSTGRES_DB:dcmDB'
      - 'POSTGRES_USER:postgres'
      - 'POSTGRES_PASSWORD:admin'

volumes:
  db-data:

在 App config.ini 中：

[DEFAULT]
DB_NAME = user
DB_PASSWORD = admin
DB_USER = postgres
DB_HOST = localhost
DB_PORT = 5433
DEBUG = True

我已经完成了 '/var/lib/postgresql/data' location 'listen adress = *' is there 。不知道如何处理。

Answer 1

Docker 中的每个容器都是一个单独的主机，这意味着你无法从 dcs_web 使用 localhost 访问 Postgres，你必须使用 Postgres 容器的主机名，默认情况下是服务的名称在 Docker Compose 文件中定义，在您的情况下为：db。

在您的config.ini 中将localhost 替换为db，它应该可以工作。