pythondockerurldatabase-connectionh2o

How do I connect a Python app in a docker container with a running Docker container with a URL?

I have an app in Python that I want to run in a Docker container and it has a line:

h2o.connect(ip='127.0.0.1', port='54321')

The h2o server is running in a Docker container and it always has a different IP. One time it was started on 172.19.0.5, the other time 172.19.0.3, sometimes 172.17.0.3. So it is always random, and I can't connect the Python app. I tried to expose the port of h2o server to localhost and then connect the Python (the code above), but it is not working.

Solution

  • You dont connect two docker containers though ip addresses. Instead, you want to use docker internal network aliases: 

    version: '3'
services:
  server:
    ...
    depends_on:
      - database
  database:
    ...
    expose:
      - 54321:54321

    then you can define your connectio in server as: h2o.connect(ip='127.0.0.1', port='54321')