Connect python with h2o that runs in docker, but ipv4 for h2o changes

Question

I'm new to docker and I'm trying to run h2o in docker and then use python to connect to it. I have folder with: model-generator folder in which I have the python script and Dockerfile to build an image h2o-start folder in which I have h2o.jar file and Dockerfile to start that jar docker-compose.yml file with:

version: "3"
services:
   h2o-start:
      image: milanpanic2/h2o-start
      build: 
         context: ./h2o-start
      restart: always
   model-generator:
      image: milanpanic2/model-generator
      build:
         context: ./model-generator
      restart: always

My python script contains:

import h2o   

h2o.connect(ip='172.19.0.3', port='54321')

When I run docker-compose up it gives me an error that python can't connect, because there isn't anything on 172.19.0.3

Dockerfile for python

FROM python:2.7-slim
WORKDIR /app
ADD . /app
RUN pip install > --trusted-host pypi.python.org -r requirements.txt 
EXPOSE 80 
ENV NAME World 
CMD ["python", "passhash.py"]

Dockerfile for h2o

FROM openjdk:8
ADD h2o.jar h2o.jar
EXPOSE 54321 EXPOSE 54322
ENTRYPOINT ["java", "-jar", "h2o.jar"]

Answer 1

Try to start container exposing port 54321: add to your h2o-start: in docker-compose file:

ports: 
  - "54321:54321"
  - "54322:54322"