CODEWITHSUNDEEP
mongodbdockerdocker-composedockerfile
Erik
Erik

Reputation: 3218

Trying to connect a NodeJS app to MongoDB via Docker Compose

I'm following a MongoDB + NodeJS tutorial with my app. Everything works without Docker.. and I can in fact get the app to work up until it needs to connect to MongoDB.

If my app doesn't see MongoDB, it will print out an error and halt.

Here's my files

.env

NODE_VIEWS_PATH=../
NODE_PUBLIC_PATH=../
MONGODB_URI='mongodb://127.0.0.1:27017/myappsdb'
...

Dockerfile

FROM node:carbon

# Create app directory
WORKDIR /usr/src/mahrio

COPY package*.json ./

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

COPY . .

EXPOSE 6085

CMD ["npm", "start"]

docker-compose.yml

version: "2"
services:
  app:
    container_name: someappname
    restart: always
    build: .
    ports:
      - "6085:6085"
    links:
      - mongo
    depends_on:
      - mongo
  mongo:
    container_name: mongo
    image: mongo
    volumes:
      - ./tmp:/data/db
    ports:
      - "27017:27017"

Upvotes: 1

Views: 486

Answers (1)

yamenk
yamenk

Reputation: 51906

When using docker-compose, for a container to connect to another container it can use the service name as a hostname to connect.

In your case, the node app needs to connect to mongo:27017 rather than localhost:27017, since localhost from the respective of the app container will refer to itself and not to your machine.

Therefore, change the mongo url to MONGODB_URI='mongodb://mongo:27017/myappsdb'. Also make sure that you consume the env file by adding:

app:
 ...
 env_file:
   - file.env

Upvotes: 3

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