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Dockerized Nextjs App can't access MongoDB Container

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Clytax posted this in #help-forum
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ClytaxOP
I have created a MongoDB container and a Next.js container. For some reason, I can access the MongoDB container with 'localhost' when running Next.js locally (not in a container). But as soon as I start the container, the app doesn't have access anymore.

Here is my Docker Compose for the MongoDB database:
version: "3.8"
services:
  mongo:
    image: mongo:7.0
    environment:
      MONGO_INITDB_ROOT_USERNAME: clytax
      MONGO_INITDB_ROOT_PASSWORD: 12345678
    ports:
      - 27017:27017
    volumes:
      - mongodata:/data/db
volumes:
  mongodata:
    driver: local


and this is my Dockerfile for the client app. I added the ENVs just to try it but it's probably not needed
FROM node:20


ENV MONGODB_URI mongodb://clytax:12345678@localhost:27017
ENV NEXTAUTH_SECRET <removed>
ENV NEXT_PUBLIC_API_URL http://localhost:3000/api
ENV JWT_SECRET <removed>

WORKDIR /app

COPY package.json .

RUN npm install

COPY . .

EXPOSE 3000

CMD ["npm", "run", "dev"]


I don't understand why I can't access the database when inside the Docker website. However, connecting locally works as usual. I tried using 'mongo', 'mongo-1', or 'mongodb' instead of 'localhost', but it's still not working.

my env varibles are in .env.local

This is the first time I am using docker
Answered by Ray
you need to create a network for them
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Answer
Ray
version: "3.8"
services:
  mongo:
    image: mongo:7.0
    environment:
      MONGO_INITDB_ROOT_USERNAME: clytax
      MONGO_INITDB_ROOT_PASSWORD: 12345678
    ports:
      - 27017:27017
    volumes:
      - mongodata:/data/db
    networks:
    - my_network

  web:
    build: ./path-to-dockerfile
    ports:
        - 3000:3000
    networks:
      - my_network

volumes:
  mongodata:
    driver: local

networks:
  my_network:
    external: true
@Clytax Thank you! do I need to change something to my nextjs docker then or do I use my_network instead of localhost?
Ray
yeah the url for mongodb mongodb://clytax:12345678@mongo:27017
you can connect other container with the name in the same network
ClytaxOP
amazing it works! thanks alot. is there away to get the same network without docker compose? I have to do it for a class exercise, not sure if we can use docker compose for both
@Clytax amazing it works! thanks alot. is there away to get the same network without docker compose? I have to do it for a class exercise, not sure if we can use docker compose for both
Ray
yes, you can do that with cli
docker network create my_network
docker network connect my_network web
docker network connect my_network mongo