Flask with MongoDB Docker 图片无法连接

Question

我收到服务器超时错误，所以我假设我的 MongoDB 和 flask 应用程序存在连接错误。

在docker-compose.yml

  mongodb:
    image: mongo:latest
    hostname: test_mongodb
    environment:
      - MONGO_INITDB_DATABASE=staff_db
      - MONGO_INITDB_ROOT_USERNAME=admin
      - MONGO_INITDB_ROOT_PASSWORD=password
    volumes:
      - ./init-db.js:/docker-entrypoint-initdb.d/init-db.js:ro
    ports:
      - 27017:27017

app.py

def get_db():
    client = MongoClient(host='test_mongodb',
                         port=27017,
                         username='admin',
                         password='password',
                         authSource='admin')
    db = client["staff_db"]
    print("connection good")
    return db


@app.route('/location')
def get_staff_location():
    db = ""
    staffs = []
     try:
        db = get_db()
        _staffs = db.beaconLocation_tb.find()

        for staff in _staffs:
            temp_dict = {
                "id": staffLocation["id"],
                "staffid": staffLocation["staffid"],
                "name": staffLocation["name"]
            }
            staffs.append(temp_dict)
    
        return jsonify({'staff': staffs})
    except:
        pass
    finally:
        if type(db) == MongoClient:
           db.close()

init-db.js

db = db.getSiblingDB("staff_db");
db.staff_tb.drop();

db.staff_tb.insertMany([
    {
        "id":1,
        "staffid": 1,
        "name": "Darren"
    },
    {
        "id": 2,
        "staffid": 2,
        "name": "Tony"
    },
]);

错误信息

pymongo.errors.ServerSelectionTimeoutError: test_mongodb:27017: [Errno -3] Temporary failure in name resolution, Timeout: 30s, Topology Description: <TopologyDescription id: 6194ffbbbce36c5d06b983f6, topology_type: Single, servers: [<ServerDescription ('test_mongodb', 27017) server_type: Unknown, rtt: None, error=AutoReconnect('ict3102_mongodb:27017: [Errno -3] Temporary failure in name resolution')>]>

有人能看到我犯的错误吗？

Answer 1

hostname: 在 Compose 设置中几乎什么都不做。如果您 docker exec 在容器中获取 shell 并且 shell 提示显示本地主机名，该设置将更改显示在那里的主机名，但这几乎是唯一的它将产生的影响。您通常不需要设置此选项。

反之，Compose服务名可以作为容器间通信的主机名。此设置在 Docker 文档的 Networking in Compose 中有进一步描述。

  mongodb:                    # <-- this is a valid host name
    image: mongo:latest
    # hostname: test_mongodb  # <-- does nothing, remove it
    ports:                    # <-- optional and ignored for connections
      - 27017:27017           #     between containers; always use 27017

我建议让您的数据库连接信息可通过环境变量进行配置。请注意，如果您从容器或 Docker.

之外的开发环境连接，则需要连接到此 MongoDB 实例的主机名会有所不同

# If the environment variable is unset (you're running it from a
# non-Docker virtual environment) use a reasonable default for a
# local developer
client = MongoClient(os.environ.get('MONGODB_HOST', 'localhost'), ...)

version: '3.8'
services:
  application:
    build: .
    environment:
      MONGODB_HOST: mongodb  # its Compose service name, not its hostname:

Flask with MongoDB Docker 图片无法连接

Flask with MongoDB Docker Image unable to connect

python

mongodb

flask

docker

docker-compose