How can I create a Docker image to run both Python and R?

Question

I want to containerise a pipeline of code that was predominantly developed in Python but has a dependency on a model that was trained in R. There are some additional dependencie

Answer 1

The Dockerfile I built for Python and R to run together with their dependencies in this manner is:

FROM ubuntu:latest

ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && apt-get install -y --no-install-recommends build-essential r-base r-cran-randomforest python3.6 python3-pip python3-setuptools python3-dev

WORKDIR /app

COPY requirements.txt /app/requirements.txt

RUN pip3 install -r requirements.txt

RUN Rscript -e "install.packages('data.table')"

COPY . /app

The commands to build the image, run the container (naming it SnakeR here), and execute the code are:

docker build -t my_image .
docker run -it --name SnakeR my_image
docker exec SnakeR /bin/sh -c "python3 test_call_r.py"

I treated it like a Ubuntu OS and built the image as follows:

• suppress the prompts for choosing your location during the R install;
• update the apt-get;
• set installation criteria of:
• • y = yes to user prompts for proceeding (e.g. memory allocation);
• • install only the recommended, not suggested, dependencies;
• include some essential installation packages for Ubuntu;
• r-base for the R software;
• r-cran-randomforest to force the package to be available (unlike the separate install of data.table which didn’t work for randomForest for some reason);
• python3.6 version of python;
• python3-pip to allow pip be used to install the requirements;
• python3-setuptools to somehow help execute the pip installs (?!);
• python3-dev to execute the JayDeBeApi installation as part of the requirements (that it otherwise confuses is for Python2 not 3);
• specify the active “working directory” to be the /app location;
• copy the requirements file that holds the python dependencies (built from the virtual environment of the Python codebase, e.g., with pip freeze);
• install the Python packages from the requirements file (pip3 for Python3);
• install the R packages (e.g. just data.table here);
• copy the directory contents to the specified working directory /app.

This is replicated from my blog post at https://datascienceunicorn.tumblr.com/post/182297983466/building-a-docker-to-run-python-r