Docker Cookbook - Second Edition

Getting ready

Make the following preparations:

• As we are going to use example code from Flask's GitHub repository, let's clone it:

        $ cd /tmp       $ git clone https://github.com/pallets/flask

• Create a Dockerfile_2.7 file, as follows, and then build an image from it:

    $ cat /tmp/Dockerfile_2.7    FROM python:2.7    RUN pip install flask pytest    ADD flask/ /flask    WORKDIR /flask/examples/tutorial    RUN pip install -e .    CMD ["/usr/local/bin/pytest"]

• To build the python2.7test image, run the following command:

       $ docker image build -t python2.7test -f /tmp/Dockerfile_2.7 .

• Similarly, create a Dockerfile with python:3.7 as the base image and build the python3.7test image:

    $ cat /tmp/Dockerfile_3.7    FROM python:3.7    RUN pip install flask pytest ADD flask/ ...