mongodb - 无法将 mongodb 容器连接到 docker 中的节点容器

Question

我用 this repo 中的 2 个图像制作了 3 个 docker 容器和 1 使用 MongoDB 公共(public)图像。我使用 sudo docker-compose -f docker-compose.yaml up

打开了所有三个容器

docker-compose.yaml 是:

version: '3'
services:
  frontend:
    image: samar080301/mern-frontend:1.0
    ports:
      - 3000:3000
  backend:  
    image: samar080301/mern-backend:1.0
    ports:
      - 5000:5000
  mongodb:
    image: mongo:latest
    ports:
      - 27017:27017

但是MongoDB无法连接到节点服务器并报错:

backend_1   | > crud-app@1.0.0 start /home/app
backend_1   | > node server.js
backend_1   | 
backend_1   | (node:18) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
backend_1   | (Use `node --trace-deprecation ...` to show where the warning was created)
backend_1   | App running on port 5000
backend_1   | Error with the database! MongoNetworkError: failed to connect to server [localhost:27017] on first connect [Error: connect ECONNREFUSED 127.0.0.1:27017
backend_1   |     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1141:16) {
backend_1   |   name: 'MongoNetworkError'
backend_1   | }]
backend_1   |     at Pool.<anonymous> (/home/app/node_modules/mongodb/lib/core/topologies/server.js:438:11)
backend_1   |     at Pool.emit (events.js:315:20)
backend_1   |     at /home/app/node_modules/mongodb/lib/core/connection/pool.js:562:14
backend_1   |     at /home/app/node_modules/mongodb/lib/core/connection/pool.js:995:11
backend_1   |     at /home/app/node_modules/mongodb/lib/core/connection/connect.js:32:7
backend_1   |     at callback (/home/app/node_modules/mongodb/lib/core/connection/connect.js:280:5)
backend_1   |     at Socket.<anonymous> (/home/app/node_modules/mongodb/lib/core/connection/connect.js:310:7)
backend_1   |     at Object.onceWrapper (events.js:422:26)
backend_1   |     at Socket.emit (events.js:315:20)
backend_1   |     at emitErrorNT (internal/streams/destroy.js:84:8)
backend_1   |     at processTicksAndRejections (internal/process/task_queues.js:84:21)
backend_1   | (node:18) UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to server [localhost:27017] on first connect [Error: connect ECONNREFUSED 127.0.0.1:27017
backend_1   |     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1141:16) {
backend_1   |   name: 'MongoNetworkError'
backend_1   | }]

backend/db.js代码:

const mongoose = require('mongoose');
// Allow Promises
mongoose.Promise = global.Promise;
// Connection
mongoose.connect('mongodb://localhost:27017/db_test', { useNewUrlParser: true });
// Validation
mongoose.connection
  .once('open', () => console.log('Connected to the database!'))
  .on('error', err => console.log('Error with the database!', err));

docker inspect mongodb 的终端输出:

将 mongo uri 添加为环境变量后的终端输出:

backend_1   | App running on port 5000
backend_1   | (node:19) UnhandledPromiseRejectionWarning: MongooseError: The `uri` parameter to `openUri()` must be a string, got "undefined". Make sure the first parameter to `mongoose.connect()` or `mongoose.createConnection()` is a string.
backend_1   | (node:19) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)

新错误:

backend_1   | Error with the database! MongoNetworkError: failed to connect to server [merncrudapp_mongodb_1:27017] on first connect [Error: connect ECONNREFUSED 172.23.0.3:27017
backend_1   |     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1141:16) {
backend_1   |   name: 'MongoNetworkError'
backend_1   | }]

Answer 1

尝试不使用 localhost 而是使用容器名称进行连接。因此，例如，如果您想从另一个容器(在同一个 docker 网络中)连接到 MongoDB，您可以使用 mongodb:27017。它应该有效。