Django 2 example app for OpenShift (Kubernetes)

Dominate Pizza, the site for pizza lovers

Using Django 2, Gunicorn and Django Rest Framework.

Serving static content

The application will be served in OpenShift by Gunicorn. By default the Python S2I container will run the Django collect static command (change behavior with DISABLE_COLLECTSTATIC). Since those files cannot be placed on persistent volume during build and these are not served by the development Django server, you need to go for one of these options:

Make Gunicorn serve /static. Done here by using WhiteNoise. If used in production, add a cache layer (Nginx, CDN...).
Overwrite the default Python S2I build action hook to collect static files (default is in assemble step) to place files on a shared mounted PV with RWX access between the Django instance(s) and a Nginx instance.

OpenShift settings

Common environment variables to overwrite defaults:

DEBUG
DJANGO_LOG_LEVEL
DJANGO_SECRET_KEY
OPENSHIFT_REPO_DIR

Deployment

When deploying a Python application in OpenShift, the DeploymentConfig created uses the Rolling strategy which is a risk since OpenShift automatically calls Django's migrate when starting the container. There for it's safer to change the strategy to Recreate.

Development

If running locally (127.0.0.1) and setting DEBUG to True, the Django Debug Toolbar will be shown.