本地Mongoose连接超时和崩溃

Question

我正在建立一个非常简单的全栈web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注册后的用户信息。这已经运行了很长一段时间，但我最近在离开应用程序一周后运行了它，结果发生了这样的事情：

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文件的一个非常精简的版本：

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，工作非常完美。

Answer 1

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

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

然后在安装之后。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后，在终端中运行以下命令。

  • mongod