无法使用docker compose连接到docker容器上的neo4j数据库

如何解决无法使用docker compose连接到docker容器上的neo4j数据库

这是我用来创建数据库容器的docker-compose.yml。

version: '3.7'
services:

  application:
    build:
      context: ./app
      dockerfile: dockerfile #dockerfile-prod
    depends_on:
      - database_mongo
      - database_neo4j
      - etl_pipeline
    environment:
      - flask_env=dev #flask_env=prod
    volumes:
      - ./app:/app
    ports:
      - "8080:8080" #- 8080:8080

  database_mongo:
    image: "mongo:4.2"
    expose:
      - 27017
    volumes:
      - ./data/database/mongo:/data/db

  database_neo4j:
    image: neo4j:latest
    expose:
      - 27018
    volumes:
      - ./data/database/neo4j:/data
    ports: 
      - "7474:7474" # web client
      - "7687:7687" # DB default port 
    environment: 
      -  NEO4J_AUTH=none
    
  etl_pipeline:
    depends_on:
      - database_mongo
      - database_neo4j
    build:
      context: ./data/etl
      dockerfile: dockerfile #dockerfile-prod
    volumes:
    - ./data/:/data/
    - ./data/etl:/app/

我正在尝试使用python驱动程序连接到neo4j数据库。我已经可以通过以下这一行连接到mongoDb：

mongo_client = MongoClient(host="database_mongo")

我正在尝试执行类似于mongoDb的操作，以便通过neo4j中的GraphDatabase连接到我的neo4j，如下所示：

url = "{scheme}://{host_name}:{port}".format(scheme = "bolt",host_name="database_neo4j",port = 7687)
baseNeo4j = GraphDatabase.driver(url,encrypted=False)

或使用py2neo这样的

neo_client = Graph(host="database_neo4j")

但是，这一切都没有起作用，因此我不确定是否要使用正确的语法以便将neo4j与docker一起使用。我尝试了很多事情，环顾四周，但找不到答案...

整个错误消息是：

etl_pipeline_1    | MongoClient(host=['database_mongo:27017'],document_class=dict,tz_aware=False,connect=True)
etl_pipeline_1    | Traceback (most recent call last):
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 929,in _connect
etl_pipeline_1    |     s.connect(resolved_address)
etl_pipeline_1    | ConnectionRefusedError: [Errno 111] Connection refused
etl_pipeline_1    | 
etl_pipeline_1    | During handling of the above exception,another exception occurred:
etl_pipeline_1    | 
etl_pipeline_1    | Traceback (most recent call last):
etl_pipeline_1    |   File "main.py",line 26,in <module>
etl_pipeline_1    |     baseNeo4j = GraphDatabase.driver(url,encrypted=False)
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/__init__.py",line 183,in driver
etl_pipeline_1    |     return cls.bolt_driver(parsed.netloc,auth=auth,**config)
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/__init__.py",line 196,in bolt_driver
etl_pipeline_1    |     return BoltDriver.open(target,line 359,in open
etl_pipeline_1    |     pool = BoltPool.open(address,pool_config=pool_config,workspace_config=default_workspace_config)
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 531,in open
etl_pipeline_1    |     seeds = [pool.acquire() for _ in range(pool_config.init_size)]
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",in <listcomp>
etl_pipeline_1    |     seeds = [pool.acquire() for _ in range(pool_config.init_size)]
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 545,in acquire
etl_pipeline_1    |     return self._acquire(self.address,timeout)
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 409,in _acquire
etl_pipeline_1    |     connection = self.opener(address,line 528,in opener
etl_pipeline_1    |     return Bolt.open(addr,timeout=timeout,routing_context=routing_context,**pool_config)
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 198,in open
etl_pipeline_1    |     keep_alive=pool_config.keep_alive,etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 1049,in connect
etl_pipeline_1    |     raise last_error
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 1039,in connect
etl_pipeline_1    |     s = _connect(resolved_address,timeout,keep_alive)
etl_pipeline_1    |   File "/usr/local/lib/python3.7/site-packages/neo4j/io/__init__.py",line 943,in _connect
etl_pipeline_1    |     raise ServiceUnavailable("Failed to establish connection to {!r} (reason {})".format(resolved_address,error))
etl_pipeline_1    | neo4j.exceptions.ServiceUnavailable: Failed to establish connection to IPv4Address(('172.29.0.2',7687)) (reason [Errno 111] Connection refused)

解决方法

好吧，也许这不是最好的答案，但是对于其他有此问题的人，我可以通过在main开头添加to_be_replaced = ['C11','C27','C2'] replace_with = ['C1','C16','C22','C6'] 来解决此问题

,

您可以尝试创建网络并在您的服务中使用它。像这样：

networks:
  neo4j_network:
    driver: bridge
services:
  neo4j:
    image: neo4j:latest
    expose:
      - 27018
    volumes:
      - ./data/database/neo4j:/data
    ports: 
      - "7474:7474" # web client
      - "7687:7687" # DB default port 
    environment: 
      -  NEO4J_AUTH=none
    networks:
      - neo4j_network
  application:
    build:
      context: ./app
      dockerfile: dockerfile #dockerfile-prod
    depends_on:
      - database_mongo
      - database_neo4j
      - etl_pipeline
    environment:
      - flask_env=dev #flask_env=prod
    volumes:
      - ./app:/app
    ports:
      - "8080:8080"
    networks:
      - neo4j_network

然后，对于您的 Neo4j 驱动程序 URL（在您的代码中），请确保使用 bolt://host.docker.internal:7687