docker python 数据库无法翻译主机名

问题描述

当我尝试运行 python 图像时：

@H_502_3@docker run --name pytana -p 5050:5050 -it  --network city  pythonbac

出现错误

@[e-mail]: Could not translate host name "db_container_name" to address: Name or service not kNown

源中有连接

@H_502_3@db = PostgresqlDatabase('postgres',user='postgres',password='postgres',host='db_container_name',port=5432)

docker 文件

@H_502_3@FROM python:3-onbuild
EXPOSE 5050
CMD ["python","./app.py"]

db docker 撰写文件

@H_502_3@# This configuration is intended for development purpose,it's **your** responsibility to harden it for production
version: '3.8'
services:
  postgresql:
    image: postgres:13.1
    volumes:
        - testdataloc:/var/lib/postgresql/data/
    environment:
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    container_name: db_container_name 
    networks:
      - city  
    # If you want to expose these ports outside your dev PC,# remove the "127.0.0.1:" prefix
    ports:
      - 5432:5432
volumes:
    testdataloc:
        external: true            
networks:
  city:
    # Use a custom driver
    driver: bridge

我的操作系统 wind10。 当我使用网络主机并将主机连接到本地主机时的附加信息。

@H_502_3@docker network inspect city
    [
        {
            "Name": "city","Id": "1734484676b63915c041bc0128d1a5b9d340cb4b76878eb54e11ea7995c0e1de","Created": "2021-03-10T14:27:03.6343643Z","Scope": "local","Driver": "bridge","EnableIPv6": false,"IPAM": {
                "Driver": "default","Options": {},"Config": [
                    {
                        "subnet": "172.19.0.0/16","Gateway": "172.19.0.1"
                    }
                ]
            },"Internal": false,"Attachable": false,"Ingress": false,"ConfigFrom": {
                "Network": ""
            },"ConfigOnly": false,"Containers": {},"Labels": {}
        }
    ]

解决方法

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