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Setting up Scancer

This repository is a collection of configuration scripts that we use to maintain the scancer.org infrastructure. They setup all the necessary pieces including:

  • Application servers for the primary Django webapp
  • TorchServe API servers that handle ML inference
  • A Postgresql database server to store application data
  • Celery workers for distributed processing of tasks

The toolchain is designed to setup these services on varying configurations of underlying hardware, from a single low-resource server to a large cluster. When setup, it brings up the following services:

  1. The user-facing webapp at scancer.org
  2. The ML inference API at api.scancer.org
  3. The ML model store at models.scancer.org
  4. The ML monitoring interface at monitoring.scancer.org

Services (2)–(4) are only accessible to the team working on and managing Scancer.

We have shared this toolchain with you so you can understand how to setup your own copy of the service on your own servers.

How to use these scripts

Locally

You can install the entire stack locally on a single Ubuntu virtual machine. For this, you need to first have the following tools:

  1. VirtualBox
  2. Vagrant
  3. Ansible

When you've installed these tools, navigate to the folder you have cloned this repository to and run

vagrant up

If you add the following entry to your local DNS (which is /etc/hosts on macOS and Linux),

192.168.33.16   www.scancer-local.org
192.168.33.16   scancer-local.org
192.168.33.16   api.scancer-local.org
192.168.33.16   models.scancer-local.org

you should be able to navigate to scancer-local.org and see the site functioning.

In production

This is a bit more involved. You first need to decide the servers you want to have to deal with the amount of traffic you're expecting. Typically, having:

  • A good server for the database
  • Two servers for the webapp
  • Two servers for the API
  • Two servers as workers

should suffice.

Provision these handful of servers (running Ubuntu 20.04) in your cloud provider of choice and note down the IP addresses of these machines.

You can then edit servers/prodduction.yml to point to these different serves. When done, run:

ansible-playbook site.yml -i servers/production

While you are waiting for this to finish, go to your DNS provider and point your domain to the primary application server. When the Ansible run finishes, you should be able to access the site.

Copyright and license

Copyright (c) 2021 Harish Narayanan and Daniel Hen.

This code is licenced under the MIT Licence. See LICENSE for the full text of this licence.