螺栓连接，Docker组合+Neo4j+节点

Question

我几乎可以肯定这与港口连接有关；准确地说，使用我在驱动程序连接中使用的URL参数：

    var driver = neo4j.driver("bolt://neo4j:7687", neo4j.auth.basic("tester", "tester"));

其中“7687”是Neo4j在docker-compose.yml中的螺栓端口，“Neo4j”是我分配给Neo4j图像的名称（见下文）。

我正在遵循（使用不同的JS驱动程序）我能找到的唯一的Node+Neo4J+Docker教程(https://medium.com/@slavahatnuke/neo4j-node-js-docker-docker-compose-fdc1cc9cf405)，那里的用户评论似乎证实了错误在我的连接URL中。

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    "use strict";

    var express = require('express');
    var neo4j = require('neo4j-driver').v1;
    const PORT = 8080;

    var app = express();

    //below is a test of the Neo4j connection, with which I have trouble connecting from in a Docker container

    router.get('/test', function (req, res) {
        var driver = neo4j.driver("bolt://neo4j:7687", neo4j.auth.basic("tester", "tester"));

        var session = driver.session();
        console.log(session);
        var countPromise = session.readTransaction(function(transaction) {
        var result = transaction.run("MATCH (n) RETURN COUNT(n) AS c")
            .then(function(result) {
                console.log(result);
                return result.records[0].get("c");
            });
            return result;
        });
        countPromise.then(function(result) {
            res.json(result);
            session.close();
            driver.close();
        });

    });


    app.listen(PORT);
    console.log("Running on " + PORT);

    module.exports = app;

Neo4j图像是Docker的官方Neo4j图像。

我正在使用以下docker-compose.yml文件：

nodeapp:
  image: node:latest
  volumes:
   - ./nodeapp:/nodeapp
  links:
   - neo4j
  ports:
   - "18080:8080"
  working_dir: /nodeapp
  entrypoint: node index.js

neo4j:
  image: neo4j
  ports:
   - "17474:7474"
   - "17687:7687"
  volumes:
  - ./db/dbms:/data/dbms

当我运行它（使用“docker-compose up”）时，我可以：

我肯定有一些简单的东西Docker写作，我错过了。

在没有Docker的情况下，我使用URL“bolt：//localhost:7687”成功地将应用程序连接到数据库。现在它在Docker中，我不知道我该用什么。

谢谢你的指导。

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      Name             Command             State              Ports       
-------------------------------------------------------------------------
initialnode_neo4   /docker-           Up                 7473/tcp, 0.0.0. 
j_1                entrypoint.sh                         0:17474->7474/tc 
                   neo4j                                 p, 0.0.0.0:17687 
                                                         ->7687/tcp       
initialnode_node   node index.js      Up                 0.0.0.0:18080->8 
app_1                                                    080/tcp  

     "NetworkMode": "default",
                "PortBindings": {
                    "7474/tcp": [
                        {
                            "HostIp": "",
                            "HostPort": "17474"
                        }
                    ],
                    "7687/tcp": [
                        {
                            "HostIp": "",
                            "HostPort": "17687"
                        }
                    ]
                },

    ...
    "ExposedPorts": {
                    "7473/tcp": {},
                    "7474/tcp": {},
                    "7687/tcp": {}
                },
    ...
    "NetworkSettings": {
                "Bridge": "",
                "SandboxID": "5eb2b7805cc802391c08be8c85cdbb19fd42de6cc794e76e57f5214c6763c140",
                "HairpinMode": false,
                "LinkLocalIPv6Address": "",
                "LinkLocalIPv6PrefixLen": 0,
                "Ports": {
                    "7473/tcp": null,
                    "7474/tcp": [
                        {
                            "HostIp": "0.0.0.0",
                            "HostPort": "17474"
                        }
                    ],
                    "7687/tcp": [
                        {
                            "HostIp": "0.0.0.0",
                            "HostPort": "17687"
                        }
                    ]
                },

    ...

    "Gateway": "172.17.0.1",
                "GlobalIPv6Address": "",
                "GlobalIPv6PrefixLen": 0,
                "IPAddress": "172.17.0.2",
                "IPPrefixLen": 16,
                "IPv6Gateway": "",
                "MacAddress": "02:42:ac:11:00:02",
                "Networks": {
                    "bridge": {
                        "IPAMConfig": null,
                        "Links": null,
                        "Aliases": null,
                        "NetworkID": "8ffa640b707301bb9b8b6c2a1cfb6f5deac8c1a5f5de9e9de0976697b01027ef",
                        "EndpointID": "941911b65cf0b714fa13ac45ca967478a513fe5c282283aa0bfe20afcc0df06f",
                        "Gateway": "172.17.0.1",
                        "IPAddress": "172.17.0.2",
                        "IPPrefixLen": 16,
                        "IPv6Gateway": "",
                        "GlobalIPv6Address": "",
                        "GlobalIPv6PrefixLen": 0,
                        "MacAddress": "02:42:ac:11:00:02"
                    }
                }
            }
    ...

    {"log":"  _writeConnectionHolder: \n","stream":"stdout","time":"2017-05-05T16:20:59.37931736Z"}
    {"log":"   ConnectionHolder {\n","stream":"stdout","time":"2017-05-05T16:20:59.379324034Z"}
    {"log":"     _mode: 'WRITE',\n","stream":"stdout","time":"2017-05-05T16:20:59.379330305Z"}
    {"log":"     _connectionProvider: \n","stream":"stdout","time":"2017-05-05T16:20:59.379353139Z"}
    {"log":"      DirectConnectionProvider {\n","stream":"stdout","time":"2017-05-05T16:20:59.379363823Z"}
    {"log":"        _address: 'neo4j:7687',\n","stream":"stdout","time":"2017-05-05T16:20:59.3793706Z"}
    {"log":"        _connectionPool: [Object],\n","stream":"stdout","time":"2017-05-05T16:20:59.379377162Z"}
    {"log":"        _driverOnErrorCallback: [Function: bound _driverOnErrorCallback] },\n","stream":"stdout","time":"2017-05-05T16:20:59.379384507Z"}
    {"log":"     _referenceCount: 0,\n","stream":"stdout","time":"2017-05-05T16:20:59.379391793Z"}
    {"log":"     _connectionPromise: Promise { null } },\n","stream":"stdout","time":"2017-05-05T16:20:59.379398668Z"}
    {"log":"  _open: true,\n","stream":"stdout","time":"2017-05-05T16:20:59.379405771Z"}
    {"log":"  _hasTx: false,\n","stream":"stdout","time":"2017-05-05T16:20:59.379412739Z"}
    {"log":"  _lastBookmark: undefined,\n","stream":"stdout","time":"2017-05-05T16:20:59.379437046Z"}
    {"log":"  _transactionExecutor: \n","stream":"stdout","time":"2017-05-05T16:20:59.379445641Z"}
    {"log":"   TransactionExecutor {\n","stream":"stdout","time":"2017-05-05T16:20:59.379452547Z"}
    {"log":"     _maxRetryTimeMs: 30000,\n","stream":"stdout","time":"2017-05-05T16:20:59.379459251Z"}
    {"log":"     _initialRetryDelayMs: 1000,\n","stream":"stdout","time":"2017-05-05T16:20:59.379466191Z"}
    {"log":"     _multiplier: 2,\n","stream":"stdout","time":"2017-05-05T16:20:59.379472573Z"}
    {"log":"     _jitterFactor: 0.2,\n","stream":"stdout","time":"2017-05-05T16:20:59.379478888Z"}
    {"log":"     _inFlightTimeoutIds: [] } }\n","stream":"stdout","time":"2017-05-05T16:20:59.379485201Z"}
    {"log":"(node:1) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): Error: Connection was closed by server\n","stream":"stderr","time":"2017-05-05T16:21:32.301674097Z"}

Answer 1

似乎这个问题是由于我的个人电脑设置，这解释了为什么没有其他人有这个问题。

除了Docker Neo4j映像之外，我还运行了一个本地版本的Neo4j，它们都使用相同的端口。

这导致连接被拒绝。

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