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How one Docker container can call another Docker container

I have two Docker containers

  • Web interface
  • Console application calling the web API

Now, on my local webserver, the api is localhost, and in the console app, there is no problem calling the API. However, I have no idea when these two things are Dockerized, how can I make the Dockerized API available to the Url Dockerized app to the docker console app?

I don't think I need Docker Compose because I am passing the API URL as an API argument, so I just need to make sure the URL Dockerized API's

is availableDockerized Console

Any ideas?

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3 answers


The problem can be solved easily if you use the layout function. With compose, you just create one config file ( docker-compose.yml

) like this:

version: '3'
services:
  db:
    image: postgres
  web:
    build: .
    command: python3 manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db

To run it, just call it up

like this:



docker-compose up

This is the best way to get your entire stack running, so check this link: https://docs.docker.com/compose/

Success!

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You can use the option link

with docker run

:

Start the API:

docker run -d --name api api_image

Start the client:



docker run --link api busybox ping api

You should see what api

can be resolved by docker.

However, going from docker-compose

is still the best option.

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The idea is to not pass the url but the hostname of the other container you want to call.
See Networking

By default, Compose sets up one network for your application. Each container for a service joins the network by default and is accessible to and discoverable by other containers on that network by a hostname that is identical to the container name.

This will replace the deprecated --link

version .

And if your containers are not running on a single Docker node, Docker Swarm Mode , this will detect detection across multiple nodes.

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