在猫鼬中连接到本地主机时出现serverSelectionError？

Question

嗨，我尝试了mongoose.connect('mongodb://localhost/blog') 之类的所有方法，但我无法将猫鼬连接到节点，这是我的代码....

const express = require('express')
const mongoose = require('mongoose')
const articleRouter = require('./routes/articles')
const app = express()

mongoose.connect('mongodb://localhost:27017/blog')

app.set('view engine','ejs')

这是错误：

/home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongoose/lib/connection.js:807
  const serverSelectionError = new ServerSelectionError();
                               ^

MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017
    at NativeConnection.Connection.openUri (/home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongoose/lib/connection.js:807:32)
    at /home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongoose/lib/index.js:342:10
    at /home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongoose/lib/helpers/promiseOrCallback.js:32:5
    at new Promise (<anonymous>)
    at promiseOrCallback (/home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:10)
    at Mongoose._promiseOrCallback (/home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongoose/lib/index.js:1181:10)
    at Mongoose.connect (/home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongoose/lib/index.js:341:20)
    at Object.<anonymous> (/home/vishwajeet/webdeve/MARKDOWN-BLOG/server.js:8:10)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10) {
  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: 774709,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017
            at connectionFailureError (/home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongodb/lib/cmap/connect.js:375:20)
            at Socket.<anonymous> (/home/vishwajeet/webdeve/MARKDOWN-BLOG/node_modules/mongodb/lib/cmap/connect.js:295:22)
            at Object.onceWrapper (node:events:646:26)
            at Socket.emit (node:events:526:28)
            at emitErrorNT (node:internal/streams/destroy:157:8)
            at emitErrorCloseNT (node:internal/streams/destroy:122:3)
            at processTicksAndRejections (node:internal/process/task_queues:83:21) {
          [Symbol(errorLabels)]: Set(0) {}
        }
      }
    },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    logicalSessionTimeoutMinutes: undefined
  },
  code: undefined
}

Answer 1

嘿，我认为您的问题是您的计算机上没有安装mongodb。 下载后可以更改

mongoose.connect('mongodb://localhost:27017/blog')

至

mongoose.connect('mongodb://127.0.0.1/blog')

如果问题仍然存在

Youtube video for mongodb install

Answer 2

我也是同样的问题，请帮助任何人。

/app/node_modules/mongoose/lib/connection.js:847 source_code-server-1 | const serverSelectionError = new ServerSelectionError(); source_code-server-1 | ^ source_code-server-1 | source_code-server-1 | MongooseServerSelectionError: connect ECONNREFUSED 127.0.0.1:27017

运行 mongodb 服务后，我得到了 docker 的上述错误 docker-compose.yaml

版本：“3.8”

服务：

蒙哥达：

图片：“蒙哥”

卷：

• 数据：/数据/数据库 服务器：

构建：./服务器

端口：

• “4000:4000”

卷：

• 日志：/应用程序/日志

• ./服务器：/应用

• /app/node_modules

取决于：

• MongoDB 客户：

构建：./client

端口：

• “3000:3000”

环境：

• CHOKIDAR_USEPOLLING=真

卷：

• ./client/src:/app/src

标准输入打开：真

tty: 真

取决于：

• 服务器 卷：

数据：

日志：

dockerfile

从节点：18.8.0

工作目录 /app

复制包*.json /app/

运行 npm 安装

复制 。 /应用程序/

曝光 4000

CMD [“npm”，“开始”]

请帮我。