CODEWITHSUNDEEP
dockerdocker-compose
Denis Zubkov
Denis Zubkov

Reputation: 137

Connect an app inside docker service container to a database running on external network docker container

I am trying to connect some app that is a docker-compose service to a MongoDB running in a separate docker container using its own network on the same host machine. What URL should be used by the app to connect to that external network?

My steps...

Created a network and started MongoDB on that network:

docker network create my_app_mongo_db
docker run --name db-mongo -d --network=my_app_mongo_db -p 27017:27017 mongo

Created a docker-compose.yaml like so:

version: "3"
services:
  my_app:
    image: my_app
    container_name: my_app
    networks:
      - default
      - my_app_mongo_db
networks:
  default:
  my_app_mongo_db:
    external: true

The docker-compose -up starts fine and docker network inspect my_app_mongo_db shows that the service is connected to the external network.

Next I am trying to connect to MongoDB using this URL, similarly how I would connect to the DB if it was running as a service:

mongodb://my_app_mongo_db:27017

Yet this approach doesn't work with an external network. What does work is using host.docker.internal:

mongodb://host.docker.internal:27017

But according to this Docker doc:

This is for development purpose and will not work in a production environment outside of Docker Desktop for Mac.

Any ideas how to resolve this when running on a server?

Upvotes: 2

Views: 483

Answers (1)

LinPy
LinPy

Reputation: 18578

you need to connect using the Container name not the network , try this:

mongodb://db-mongo:27017

Upvotes: 1

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