Python container images

Images available on Quay are:

• CentOS 7 python-38
• RHEL 8 python-39-minimal
• CentOS Stream 9 python-39-c9s
• Fedora python-39
• Fedora python-310

This repository contains the source for building various versions of the Python application as a reproducible container image using source-to-image. Users can choose between RHEL, Fedora and CentOS based builder images. The resulting image can be run using podman or docker.

For more information about using these images with OpenShift, please see the official OpenShift Documentation.

For more information about concepts used in these container images, see the Landing page.

Note: while the examples in this README are calling podman, you can replace any such calls by docker with the same arguments

Contributing

In this repository distgen > 1.0 is used for generating directories for Python versions. Also make sure distgen imports the jinja2 package >= 2.10.

Files in directories for a specific Python version are generated from templates in the src directory with values from specs/multispec.yml.

A typical way how to contribute is:

1. Add a feature or fix a bug in templates (src directory) or values (specs/multispec.yml file).
2. Commit the changes.
3. Regenerate all files via make generate-all.
4. Commit generated files.
5. Test changes via make test TARGET=fedora VERSIONS=3.9 which will build, tag and test an image in one step.
6. Open a pull request!

For more information about contributing, see the Contribution Guidelines.

Versions

Python versions currently provided are:

• python-2.7
• python-3.6
• python-3.8
• python-3.9
• python-3.9 Minimal (tech-preview)
• python-3.10

RHEL versions currently supported are:

• RHEL 7 (catalog.redhat.com)
• RHEL 8 (catalog.redhat.com)

CentOS versions currently supported are:

• CentOS 7 (quay.io/centos7)

Fedora versions currently supported are:

• Fedora 36 (registry.fedoraproject.org)

Download

To download one of the base Python images, follow the instructions you find in registries mentioned above.

For example, Centos image can be downloaded via:

$ podman pull quay.io/centos7/python-38-centos7

Build

To build a Python image from scratch run:

$ git clone https://github.com/sclorg/s2i-python-container.git
$ cd s2i-python-container
$ make build TARGET=centos7 VERSIONS=3.8

Where TARGET might be one of the supported platforms mentioned above.

Notice: By omitting the VERSIONS parameter, the build/test action will be performed on all provided versions of Python.

Usage

For information about usage of S2I Python images, see the documentation for each version in its folder.

Test

This repository also provides a S2I test framework, which launches tests to check functionality of simple Python applications built on top of the s2i-python-container image.

$ cd s2i-python-container
$ make test TARGET=centos7 VERSIONS=3.8

Where TARGET might be one of the supported platforms mentioned above.

Notice: By omitting the VERSIONS parameter, the build/test action will be performed on all provided versions of Python.

Repository organization

• <python-version>

  • Dockerfile

    CentOS based Dockerfile.

  • Dockerfile.fedora

    Fedora based Dockerfile.

  • Dockerfile.rhel7 & Dockerfile.rhel8

    RHEL 7/8 based Dockerfile. In order to perform build or test actions on this Dockerfile you need to run the action on a properly subscribed RHEL machine.

  • s2i/bin/

    This folder contains scripts that are run by S2I:

    • assemble

      Used to install the sources into the location where the application will be run and prepare the application for deployment (eg. installing dependencies, etc.)

    • run

      This script is responsible for running the application by using the application web server.

    • usage*

      This script prints the usage of this image.

  • test/

    This folder contains a S2I test framework with multiple test aplications testing different approaches.

    • run

      Script that runs the S2I test framework.