使用Loopback和Mongodb的Docker-compose无法连接mongdb [英] Docker-compose with Loopback and Mongodb fail to connect mongdb

问题描述

我最近一直在学习docker，但无法在我的回送api和mongodb之间建立连接.该应用程序在本地开发环境中运行良好.使用docker-compose，我的mongodb服务器运行在localhost:27017上，而我的react-frontend服务在localhost:3000上，并且看起来不错.仅环回无法连接到mongodb并引发以下错误:

I have been learning docker lately and I was unable to make a connection between my loopback api and mongodb. The application works fine in local dev environment. With docker-compose my mongodb server runs at localhost:27017 and my react-frontend serves at localhost:3000 and looks fine. Only loopback is unable to connect to mongodb and throws the following errors:

loopback_1  | Web server listening at: http://localhost:8080
loopback_1  | Browse your REST API at http://localhost:8080/explorer
loopback_1  | Connection fails: MongoError: failed to connect to server 
[localhost:27017] on first connect [MongoError: connect ECONNREFUSED 
127.0.0.1:27017]
loopback_1  | It will be retried for the next request.
loopback_1  | 
loopback_1  | /opt/src/app/node_modules/mongodb/lib/mongo_client.js:421
loopback_1  |           throw err
loopback_1  |           ^
loopback_1  | MongoError: failed to connect to server [localhost:27017] 
on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]
loopback_1  |     at Pool.<anonymous> 
(/opt/src/app/node_modules/mongodb-core/lib/topologies/server.js:336:35)

这是我的 Loopback-API

FROM node:6

RUN mkdir -p /opt/src/app

WORKDIR  /opt/src/app

COPY package.json /opt/src/app

RUN npm cache clean

RUN npm install

COPY . /opt/src/app

EXPOSE 8080

CMD ["npm", "start"]

我的 docker-compose 文件如下所示:

    version: '3.0' # specify docker-compose version

# Define the services/containers to be run
services:
  database: # name of first service
      image: mongo # specify the image to build container from
      ports:
        - "27017:27017" # specify port forwarding

  loopback: # name of second service
      build: myapp_backend # specify the directory of the Dockerfile
      ports:
        - "8080:8080" # specify port mapping
      links:
        - database # link this service to the database service

  react: # name of third service
      build: myapp_frontend # specify the directory of the Dockerfile
      ports:
        - "3000:3000" #specify port mapping

最后，loopback-api中的 datasource 文件看起来像这样:

And finally datasource file in loopback-api looks like this:

    {
  "db": {
    "host": "localhost",
    "port": 27017,
    "url": "",
    "database": "test",
    "password": "",
    "name": "mongoDS",
    "user": "",
    "connector": "mongodb"
  }
}

推荐答案

您的数据源文件应具有:

Your datasource file should have:

"host": "database" ...

"host": "database" ...

因为在docker-compose.yml中，您将mongo容器作为database链接到回送，所以不是localhost.请记住，您正在尝试从回送docker容器连接到mongo.另外，您还应确保mongo在环回之前启动，因此将depends_on: database添加到docker-compose.yml中的环回服务.

since in docker-compose.yml you link mongo container to loopback as database, so it's not localhost. Remember, you are trying to connect to mongo from loopback docker container. Also you should make sure that mongo is started before loopback, so add depends_on: database to loopback service in docker-compose.yml.

这篇关于使用Loopback和Mongodb的Docker-compose无法连接mongdb的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！