本地 Mongoose 连接超时和崩溃

Question

我正在设置一个非常简单的全栈网络应用程序，可以处理用户注册和登录。为此，我使用 mongoose 作为本地数据库来存储我的用户注册后的信息.这工作了很长时间，但我最近运行我的应用程序在离开它一周后发生了这种情况：

    MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
    at NativeConnection.Connection.openUri (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/connection.js:845:32)
    at /Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/index.js:345:10
    at /Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5
    at new Promise (<anonymous>)
    at promiseOrCallback (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10)
    at Mongoose._promiseOrCallback (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/index.js:1135:10)
    at Mongoose.connect (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/index.js:344:20)
    at Object.<anonymous> (/Users/hca/Desktop/fullstacksus/server.js:26:10)
    at Module._compile (node:internal/modules/cjs/loader:1102:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1131:10)
    at Module.load (node:internal/modules/cjs/loader:967:32)
    at Function.Module._load (node:internal/modules/cjs/loader:807:14)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
    at node:internal/main/run_main_module:17:47 {
  reason: TopologyDescription {
    type: 'Unknown',
    setName: null,
    maxSetVersion: null,
    maxElectionId: null,
    servers: Map(1) { 'localhost:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    compatibilityError: null,
    logicalSessionTimeoutMinutes: null,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    commonWireVersion: null
  }
}
node:internal/process/promises:225
          triggerUncaughtException(err, true /* fromPromise */);
          ^

MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
    at NativeConnection.Connection.openUri (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/connection.js:845:32)
    at /Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/index.js:345:10
    at /Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:5
    at new Promise (<anonymous>)
    at promiseOrCallback (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/helpers/promiseOrCallback.js:30:10)
    at Mongoose._promiseOrCallback (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/index.js:1135:10)
    at Mongoose.connect (/Users/hca/Desktop/fullstacksus/node_modules/mongoose/lib/index.js:344:20)
    at Object.<anonymous> (/Users/hca/Desktop/fullstacksus/server.js:26:10)
    at Module._compile (node:internal/modules/cjs/loader:1102:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1131:10)
    at Module.load (node:internal/modules/cjs/loader:967:32)
    at Function.Module._load (node:internal/modules/cjs/loader:807:14)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
    at node:internal/main/run_main_module:17:47 {
  reason: TopologyDescription {
    type: 'Unknown',
    setName: null,
    maxSetVersion: null,
    maxElectionId: null,
    servers: Map(1) {
      'localhost:27017' => ServerDescription {
        address: 'localhost:27017',
        error: Error: connect ECONNREFUSED 127.0.0.1:27017
            at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1133:16) {
          name: 'MongoNetworkError'
        },
        roundTripTime: -1,
        lastUpdateTime: 57762916,
        lastWriteDate: null,
        opTime: null,
        type: 'Unknown',
        topologyVersion: undefined,
        minWireVersion: 0,
        maxWireVersion: 0,
        hosts: [],
        passives: [],
        arbiters: [],
        tags: []
      }
    },
    stale: false,
    compatible: true,
    compatibilityError: null,
    logicalSessionTimeoutMinutes: null,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    commonWireVersion: null
  }
}
[nodemon] app crashed - waiting for file changes before starting...

作为参考，这是我的 server.js 文件的精简版：

if (process.env.NODE_ENV !== "production") {
    require('dotenv').config({ path: '.env' });
}

const express = require('express');
const mongoose = require('mongoose');
const app = express();

mongoose.connect(process.env.MONGO_URL, { useNewUrlParser: true, useUnifiedTopology: true, 'useCreateIndex': true });
mongoose.connection.on('error', error => console.log(error));
mongoose.connection.once('open', () => console.log("Connected To Database"));

const indexRouter = require('./routes/index');

app.use('/', indexRouter);

app.listen(3030);

这是我的 .env file:

MONGO_URL=mongodb://localhost/fullstacksus

非常简单，而且，截至一周前，运行良好。

Answer 1

我认为在开始项目之前，您还必须运行 MongoDB 服务器。您可以使用以下任何一种，（假设您已经在系统中安装了 mongodb）。

我建议您从以下 link 安装 mongodb 社区版 https://docs.mongodb.com/manual/administration/install-community/

然后安装之后。只需通过命令

在终端中启动服务

Ubuntu
- sudo systemctl start mongod
Windows 将环境变量路径设置为 mongod.exe 运行后在终端中执行以下命令。
- mongod

本地 Mongoose 连接超时和崩溃

Local Mongoose Connection Timing Out And Crashing

environment-variables

mongoose

node.js

localdb