MongooseServerSelectionError ECONNREFUSED 与 docker-compose 使用 mongo 容器

Question

I'm trying to dockerize my MERN stack application in Docker and I'm able to get all the services to run in containers on a docker.network using docker-compose with a.yml file but for some reason, my app is not able to connect to the mongo service. I was able to get the app to work on my localhost but in Docker, it is not working.

Mongo connection with mongoose on backend:

 const mongoURI = `mongodb://${MONGOUN}:${MONGOPW}@mongodb:27018/names`; mongoose.connect(mongoURI, { useUnifiedTopology: true, useNewUrlParser: true }).then(() => { console.log('mongo connection established'); }).catch((error) => { console.log(`mongo connect error on ${mongoURI}`); console.log(error); }); const db = mongoose.connection; db.then(() => { console.log(`connected to mongoose`); }).catch((err) => { console.log(`error connecting to mongoose`); console.log(err); });

docker-compose.yml file:

 version: '3.1' services: app: restart: always build: . ports: - 3000:3000 links: - mongodb mongodb: image: mongo ports: - 27018:27018 expose: - "27018" environment: MONGO_INITDB_ROOT_USERNAME: admin MONGO_INITDB_ROOT_PASSWORD: password MONGO_INITDB_DATABASE: names mongo-express: image: mongo-express ports: - 8080:8081 depends_on: - mongodb environment: ME_CONFIG_MONGODB_ADMINUSERNAME: admin ME_CONFIG_MONGODB_ADMINPASSWORD: password ME_CONFIG_MONGODB_SERVER: mongodb restart: unless-stopped

Dockerfile:

 FROM node:14-alpine RUN mkdir -p /home/app COPY. /home/app WORKDIR "/home/app" EXPOSE 3000 CMD ["npm", "start"]

Error message in Docker terminal:

 app_1 | connected to mongoose app_1 | mongo connect error on mongodb://admin:password@mongodb:27018/names app_1 | MongooseServerSelectionError: connect ECONNREFUSED 192.168.48.2:27018 app_1 | at NativeConnection.Connection.openUri (/home/app/node_modules/mongoose/lib/connection.js:846:32) app_1 | at /home/app/node_modules/mongoose/lib/index.js:351:10 app_1 | at /home/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:32:5 app_1 | at new Promise (<anonymous>) app_1 | at promiseOrCallback (/home/app/node_modules/mongoose/lib/helpers/promiseOrCallback.js:31:10) app_1 | at Mongoose._promiseOrCallback (/home/app/node_modules/mongoose/lib/index.js:1149:10) app_1 | at Mongoose.connect (/home/app/node_modules/mongoose/lib/index.js:350:20) app_1 | at Object.<anonymous> (/home/app/server/db/index.js:7:10) app_1 | at Module._compile (internal/modules/cjs/loader.js:1085:14) app_1 | at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10) app_1 | at Module.load (internal/modules/cjs/loader.js:950:32) app_1 | at Function.Module._load (internal/modules/cjs/loader.js:790:12) app_1 | at Module.require (internal/modules/cjs/loader.js:974:19) app_1 | at require (internal/modules/cjs/helpers.js:93:18) app_1 | at Object.<anonymous> (/home/app/server/index.js:3:12) app_1 | at Module._compile (internal/modules/cjs/loader.js:1085:14) { app_1 | reason: TopologyDescription { app_1 | type: 'Single', app_1 | setName: null, app_1 | maxSetVersion: null, app_1 | maxElectionId: null, app_1 | servers: Map(1) { 'mongodb:27018' => [ServerDescription] }, app_1 | stale: false, app_1 | compatible: true, app_1 | compatibilityError: null, app_1 | logicalSessionTimeoutMinutes: null, app_1 | heartbeatFrequencyMS: 10000, app_1 | localThresholdMS: 15, app_1 | commonWireVersion: null app_1 | } app_1 | }

I'm just getting started with learning Docker so I've mainly been looking online at tutorials and other examples. I have hit a roadblock here though.

Here is the repo: https://github.com/nickhanrahan/shareport

Can anyone point me in the right direction here? Any help would be appreciated.

Answer 1

mongodb uses port 27017 not 27018

version: '3.1'
services:
  app:
    restart: always
    build: .
    ports:
      - 3000:3000
    links:
      - mongodb
  mongodb:
    image: mongo
    ports:
      - 27017:27017
    expose:
      - "27017"
    environment:
      MONGO_INITDB_ROOT_USERNAME: admin
      MONGO_INITDB_ROOT_PASSWORD: password
      MONGO_INITDB_DATABASE: names
  mongo-express:
    image: mongo-express
    ports:
      - 8080:8081
    depends_on:
      - mongodb
    environment:
      ME_CONFIG_MONGODB_ADMINUSERNAME: admin
      ME_CONFIG_MONGODB_ADMINPASSWORD: password
      ME_CONFIG_MONGODB_SERVER: mongodb
      ME_CONFIG_MONGODB_PORT: 27017
    restart: unless-stopped

don't forget changes in server/db/index.js

const mongoURI = mongodb://${MONGOUN}:${MONGOPW}@mongodb:27017..