This deployment is based on a single image:
In this deployment scenario, you need to provide load balancing and database layers on your own. Good example is to use it with something like Heroku and MongoDB Atlas.
# any random quite long string
# pass uri with credentials if needed
# just any string
# domain where purify is running, e.g. purify-demo.herokuapp.com
docker run --env-file=.env.custom -p 8000:3000 faloker/purify
Also, you can provide an environment variable PORT to start Purify instance on a specific port.