无法在本地主机上访问MongoDB

Question

我正在尝试运行MongoDB in Node.js。我已经在C:\mongodb下面安装了社区服务器版本的MongoDB (v.5.0.3)。

在子文件夹"data“中，我创建了另一个文件夹"db"，该文件夹当前为空。

当我在mongoDB中运行mongo.exe、Windows终端甚至Node.js终端时，一切似乎都正常。我可以查看我的数据库并创建新的数据库和集合。我还可以访问Compass中的数据库(connection ://localhost:27017)。

正如我所说的，我的"data/db“文件夹是空的，尽管我已经创建了一个新的数据库，因此我的数据库似乎存储在其他地方。这有问题吗？

在Node.js中，我正在尝试用猫鼬连接到MongoDB。我尝试了几种不同的方法，取得了不同的成功。此代码始终相同：

// Dependencies:
const express = require('express')
const app = express()
const mongoose = require('mongoose')

// Validate connection:
mongoose.connection.once('open', () => console.log('Connected do database'))
mongoose.connection.on('error', err => console.error('connection error:', err))

app.listen(5000, () => console.log('Server started'))

此URL工作(表面上)：

// Connecting to database:
mongoose.connect('mongodb://127.0.0.1:27017/testdb', { useNewUrlParser: true })

在控制台中，我得到“服务器启动”和“连接到数据库”。

但是，YouTube教程中建议的这个URL不起作用：

// Connecting to database:
mongoose.connect('mongodb://localhost/testdb', { useNewUrlParser: true })

在控制台中，我得到了“服务器启动”，但没有“连接到数据库”。然后，半分钟后，应用程序崩溃，我得到以下错误消息(我已经审查了一些个人信息)：

connection error: MongooseServerSelectionError: connect ECONNREFUSED ::1:27017
    at NativeConnection.Connection.openUri (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\connection.js:797:32)
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:330:10
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:32:5
    at new Promise (<anonymous>)
    at promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:31:10)
    at Mongoose._promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:1151:10)
    at Mongoose.connect (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:329:20)
    at Object.<anonymous> (C:\Users\xxx\Documents\xxx\xxx\xxx\app.js:13:10)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1147:10) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) { 'localhost:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  }
}
node:internal/process/promises:246
          triggerUncaughtException(err, true /* fromPromise */);
          ^

MongooseServerSelectionError: connect ECONNREFUSED ::1:27017
    at NativeConnection.Connection.openUri (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\connection.js:797:32)
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:330:10
    at C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:32:5
    at new Promise (<anonymous>)
    at promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\helpers\promiseOrCallback.js:31:10)
    at Mongoose._promiseOrCallback (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:1151:10)
    at Mongoose.connect (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongoose\lib\index.js:329:20)
    at Object.<anonymous> (C:\Users\xxx\Documents\xxx\xxx\xxx\app.js:13:10)
    at Module._compile (node:internal/modules/cjs/loader:1095:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1147:10) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) {
      'localhost:27017' => ServerDescription {
        _hostAddress: HostAddress { isIPv6: false, host: 'localhost', port: 27017 },
        address: 'localhost:27017',
        type: 'Unknown',
        hosts: [],
        passives: [],
        arbiters: [],
        tags: {},
        minWireVersion: 0,
        maxWireVersion: 0,
        roundTripTime: -1,
        lastUpdateTime: 4303888,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED ::1:27017
            at connectionFailureError (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongodb\lib\cmap\connect.js:293:20)
            at Socket.<anonymous> (C:\Users\xxx\Documents\xxx\xxx\xxx\node_modules\mongodb\lib\cmap\connect.js:267:22)
            at Object.onceWrapper (node:events:510:26)
            at Socket.emit (node:events:390:28)
            at emitErrorNT (node:internal/streams/destroy:164:8)
            at emitErrorCloseNT (node:internal/streams/destroy:129:3)
            at processTicksAndRejections (node:internal/process/task_queues:83:21)
      }
    },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  }
}

Node.js v17.0.1
[nodemon] app crashed - waiting for file changes before starting...

我的设置是否错误，因为我无法访问本地主机上的MongoDB？

Answer 1

您的设置是正确的，但是localhost似乎要解决回循环网络设备::1的IPv6 IP，而不是IPv4地址(127.0.0.1)。默认情况下，MongoDB绑定到127.0.0.1地址，我相信这就是为什么不能使用::1地址到达它的原因。

这里有几个选项:继续使用127.0.0.1IP --为什么不呢? instead.

• Change

• 编辑mongodb配置，以便将localhost解析的内容绑定到::1

• 。在linux中，您需要为此编辑/etc/hosts，不确定Windows.

。