CODEWITHSUNDEEP
node.jsmongodbdocker
amir
amir

Reputation: 2583

Nodejs application docker unable to connect to mongodb docker container

I have a nodejs application which dockerized and need a replicated MongoDB database. I have built my replicated MongoDB in docker-compose and working just fine. if I run the command docker inspect MongoDB-primary |grep IPAddress its print: 

"IPAddress": "",
            "IPAddress": "172.18.0.2",

now in my application, i give this ip as mongoconnection string(of course with protocol names) but the application cannot connect to MongoDB and throw this error message(application also is a docker container):

 message: 'failed to connect to server [172.18.0.2:27017] on first connect [MongoNetworkError: connection 1 to 172.18.0.2:27017 timed out]',

here is my mongodb docker compose file:

version: '2'

services:
  mongodb-primary:
    image: 'bitnami/mongodb:latest'
    environment:
      - MONGODB_REPLICA_SET_MODE=primary
    volumes:
      - 'mongodb_master_data:/bitnami'

  mongodb-secondary:
    image: 'bitnami/mongodb:latest'
    depends_on:
      - mongodb-primary
    environment:
      - MONGODB_REPLICA_SET_MODE=secondary
      - MONGODB_PRIMARY_HOST=mongodb-primary
      - MONGODB_PRIMARY_PORT_NUMBER=27017

  mongodb-arbiter:
    image: 'bitnami/mongodb:latest'
    depends_on:
      - mongodb-primary
    environment:
      - MONGODB_REPLICA_SET_MODE=arbiter
      - MONGODB_PRIMARY_HOST=mongodb-primary
      - MONGODB_PRIMARY_PORT_NUMBER=27017

volumes:
  mongodb_master_data:
    driver: local

and my node js application dockerfile is:

FROM node:6.0

# Create app directory
WORKDIR /usr/src/app

# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
COPY package*.json ./

RUN npm install
# If you are building your code for production
# RUN npm install --only=productio


# Bundle app source
COPY . .

EXPOSE 3001

CMD [ "npm", "start" ]

how can I fix this?

Upvotes: 0

Views: 275

Answers (2)

Nätu
Nätu

Reputation: 332

I had the same issue and adding the ports fixed it for me. Make sure your connection url includes the image name: mongodb://mongo:27017/ and not localhost.

mongo:
    image: mongo
    expose:
      - 27017
    ports:
      - "27017:27017"
    volumes:
      - ./data/db:/data/db

Upvotes: 0

grapes
grapes

Reputation: 8646

Your docker-compose does not automatically expose tcp ports to the outer world, like your host PC (I assume your nodeJs runs on host and not included in docker-compose). This is the behavior of docker bridge networks, you can read more at https://docs.docker.com/network/bridge/

You have to do one of the following:

Include your NodeJs container into docker-compose

or

Expose ports from docker-compose.yml

Upvotes: 4

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