每个在docker-compose文件中的服务可以拥有自己的Mongo实例吗？

huangapple
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英文:

Can each service in a docker-compose file have their own mongo instance?

问题

在这种情况下，我有两个服务及其各自的数据库。运行此docker-compose文件完美无缺，两个mongodb实例分别运行在它们的端口上：两个mongodb实例

问题出在其中一个服务通过mongoose连接mongodb时，例如下面是authentication服务连接authenticationdatabase时的错误信息：

  1. Error connecting to MongoDB: MongooseServerSelectionError: connection timed out
  2.   at NativeConnection.Connection.openUri (/authentication/node_modules/mongoose/lib/connection.js:825:32)
  3.   at /authentication/node_modules/mongoose/lib/index.js:414:10
  4.   at /authentication/node_modules/mongoose/lib/helpers/promiseOrCallback.js:41:5
  5.   at new Promise (<anonymous>)
  6.   at promiseOrCallback (/authentication/node_modules/mongoose/lib/helpers/promiseOrCallback.js:40:10)
  7.   at Mongoose._promiseOrCallback (/authentication/node_modules/mongoose/lib/index.js:1288:10)
  8.   at Mongoose.connect (/authentication/node_modules/mongoose/lib/index.js:413:20)
  9.   at Object.<anonymous> (/authentication/services/mongoose.js:27:10)
  10.   at Module._compile (internal/modules/cjs/loader.js:1114:14)
  11.   at Object.Module._extensions..js (internal/modules/cjs/loader.js:1143:10) {
  12. reason: TopologyDescription {
  13.   type: 'Unknown',
  14.   servers: Map(1) { 'authenticationdatabase:27017' => [ServerDescription] },
  15.   stale: false,
  16.   compatible: true,
  17.   heartbeatFrequencyMS: 10000,
  18.   localThresholdMS: 15,
  19.   setName: null,
  20.   maxElectionId: null,
  21.   maxSetVersion: null,
  22.   commonWireVersion: 0,
  23.   logicalSessionTimeoutMinutes: null
  24. },
  25. code: undefined

最后是mongoose的连接器：

  1. const mongoose = require('mongoose');
  2. const connectionString = `mongodb://${process.env.DB_USER}:${process.env.DB_PASSWORD}@${process.env.DB_NAME}:${process.env.DB_PORT}`;
  5. // 设置Mongoose连接事件监听器
  6. const db = mongoose.connection;
  7. mongoose.set('strictQuery', false)
  8. db.set('strictQuery', false);
  9. db.on('connecting', () => {
  10.   console.log('Connecting to MongoDB...');
  11. });
  13. db.on('connected', () => {
  14.   console.log('Connected to MongoDB');
  15. });
  17. db.on('error', (error) => {
  18.   console.error('Error connecting to MongoDB:', error);
  19.   process.exit(1); // 如果连接到数据库时出现错误，退出进程
  20. });
  22. db.on('disconnected', () => {
  23.   console.log('Disconnected from MongoDB');
  24. });
  26. // 连接到MongoDB
  27. mongoose.connect(connectionString);
  29. module.exports = db;

单独运行每个服务都完全正常，但合并后会导致端口阻塞或其他我看不到或找不到的问题。请帮忙解决。

尝试使用docker命令的expose选项来修复端口问题，或者插入mongo命令以使其监听不同的端口，但都没有成功。

英文:

In this case I have two services and their respective database

  1. version: '3.8'
  3. services:
  4.   authentication:
  5.     build:
  6.       context: ./authentication
  7.       dockerfile: dockerfile
  8.     environment:
  9.       PORT: 3001
  10.       DB_PORT: 27017
  11.       DB_NAME: authenticationdatabase
  12.       DB_USER: username
  13.       DB_PASSWORD: password
  14.       SIGNATURE_KEY: DITMOETGEINJECTEERDWORDEN
  15.     volumes:
  16.       - ./authentication:/authentication
  17.     ports:
  18.       - 3001:3001
  20.   authenticationdatabase:
  21.     image: mongo:latest
  22.     environment:
  23.       - MONGO_INITDB_DATABASE=authenticationdatabase
  24.       - MONGO_INITDB_ROOT_USERNAME=username
  25.       - MONGO_INITDB_ROOT_PASSWORD=password
  26.     ports:
  27.       - 27017:27017
  28.     restart: always
  29.     volumes:
  30.       - authentication_db_volume:/data/authentication
  32.   hosting:
  33.     build:
  34.       context: ./hosting
  35.       dockerfile: dockerfile
  36.     environment:
  37.       PORT: 3002
  38.       DB_PORT: 27017
  39.       DB_NAME: hostingdb
  40.       DB_USER: username
  41.       DB_PASSWORD: password
  42.       CLOUDINARY_URL: ${CLOUDINARY_URL}
  43.       JWT_SIGNATURE_KEY: DITMOETGEINJECTEERDWORDEN
  44.     volumes:
  45.       - ./hosting:/hosting
  46.     ports:
  47.       - 3002:3002
  48.     restart: always
  49.     depends_on:
  50.       - hostingdb
  52.   hostingdb:
  53.     image: mongo:latest
  54.     environment:
  55.       - MONGO_INITDB_DATABASE=hostingdb
  56.       - MONGO_INITDB_ROOT_USERNAME=username
  57.       - MONGO_INITDB_ROOT_PASSWORD=password
  58.     ports:
  59.       - 27018:27017
  60.     restart: always
  61.     volumes:
  62.       - hostingdb_volume:/data/hosting
  63. volumes:
  64.   authentication_db_volume:
  65.   hostingdb_volume:

Running this docker-compose file works perfectly, and both instances of mongodb run on their respective ports: both mongodb instances

The issue comes from when one of the services connects with mongodb through mongoose, for example here is authentication service connecting with authenticationdatabase:

  1. Error connecting to MongoDB: MongooseServerSelectionError: connection timed out
  2.   at NativeConnection.Connection.openUri (/authentication/node_modules/mongoose/lib/connection.js:825:32)
  3.   at /authentication/node_modules/mongoose/lib/index.js:414:10
  4.   at /authentication/node_modules/mongoose/lib/helpers/promiseOrCallback.js:41:5
  5.   at new Promise (<anonymous>)
  6.   at promiseOrCallback (/authentication/node_modules/mongoose/lib/helpers/promiseOrCallback.js:40:10)
  7.   at Mongoose._promiseOrCallback (/authentication/node_modules/mongoose/lib/index.js:1288:10)
  8.   at Mongoose.connect (/authentication/node_modules/mongoose/lib/index.js:413:20)
  9.   at Object.<anonymous> (/authentication/services/mongoose.js:27:10)
  10.   at Module._compile (internal/modules/cjs/loader.js:1114:14)
  11.   at Object.Module._extensions..js (internal/modules/cjs/loader.js:1143:10) {
  12. reason: TopologyDescription {
  13.   type: 'Unknown',
  14.   servers: Map(1) { 'authenticationdatabase:27017' => [ServerDescription] },
  15.   stale: false,
  16.   compatible: true,
  17.   heartbeatFrequencyMS: 10000,
  18.   localThresholdMS: 15,
  19.   setName: null,
  20.   maxElectionId: null,
  21.   maxSetVersion: null,
  22.   commonWireVersion: 0,
  23.   logicalSessionTimeoutMinutes: null
  24. },
  25. code: undefined

And finally here is the connector for mongoose:

  1. const mongoose = require('mongoose');
  2. const connectionString = `mongodb://${process.env.DB_USER}:${process.env.DB_PASSWORD}@${process.env.DB_NAME}:${process.env.DB_PORT}`;
  5. // Set up Mongoose connection event listeners
  6. const db = mongoose.connection;
  7. mongoose.set('strictQuery', false)
  8. db.set('strictQuery', false);
  9. db.on('connecting', () => {
  10.   console.log('Connecting to MongoDB...');
  11. });
  13. db.on('connected', () => {
  14.   console.log('Connected to MongoDB');
  15. });
  17. db.on('error', (error) => {
  18.   console.error('Error connecting to MongoDB:', error);
  19.   process.exit(1); // Exit the process if there is an error connecting to the database
  20. });
  22. db.on('disconnected', () => {
  23.   console.log('Disconnected from MongoDB');
  24. });
  26. // Connect to MongoDB
  27. mongoose.connect(connectionString);
  29. module.exports = db;

Running each service individually works perfectly fine, but combined causes a port block or something else which I can't see or find. Please help.

Tried port fixing with the docker command expose, or inserting the mongo command so that it listens to different ports, unsuccesful

答案1

得分: 0

我的解决方案来自于在构建时建立了一个更好的依赖关系。允许次要的Mongo镜像在构建之前等待前一个数据库解决了我的问题。在docker-desktop中先运行第一个数据库，然后运行服务，允许它们连接，然后为第二个数据库和服务重复这个过程。这个方法非常有效，所以请使用depends_on 每个在docker-compose文件中的服务可以拥有自己的Mongo实例吗？

英文:

My solution came from building a better dependency when building. Allowing the secondary mongo image to wait for the previous database before building solved my issue. Also in docker-desktop running the first database, then the service, allowing those to connect then repeat for the second database and service. This worked perfectly, so use those depends_on 每个在docker-compose文件中的服务可以拥有自己的Mongo实例吗？

huangapple
  • 本文由 发表于 2023年6月13日 01:14:54
  • 转载请务必保留本文链接：https://go.coder-hub.com/76458923.html
  • docker
  • docker-compose
  • javascript
  • mongodb
  • mongoose
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