This document discusses how theScore, a mobile sports app, develops and deploys Elixir applications using Docker, Kubernetes, and other tools. It describes theScore's use of Elixir and Phoenix for features like real-time chat. It then explains their development process using Docker, continuous integration with CircleCI, and deployment automation with ShipIt and Kubernetes. The document concludes with links to related open source projects.

1. From Dev to Prod
How theScore develops and deploys Elixir apps
Joseph An & Cristian Bratu
Thur, Sept 27, 2018

2. What does theScore do?
• mobile sports app for iOS and
Android:
• breaking news
• scores and stats for your
favorite leagues, teams,
players
• push alerts

3. How does theScore use Elixir?
Real Time Chat

4. Why use Elixir/Phoenix?
• Nice features:
• Fault tolerance
• Concurrency
• Phoenix Channel API
• Distributed Applications
• Phoenix’s PubSub layer
• Broadcasting messages across Elixir nodes within a
cluster

8. How do we deploy our apps?
Docker & Kubernetes

9. Docker (or why “containers”)?
• what about VMs?
• allows you to package your app (written in any
languages) and run it on any machines
• consistency and portability
• without containers you would install apps on a host using
the operating system’s package manager

10. Kubernetes
• open source container orchestration platform
• scheduler
• self healing
• networking

11. Libcluster: automatic cluster
formation/healing
• https://github.com/bitwalker/libcluster
• supports multiple clustering strategies including
Kubernetes
• container IP addresses are dynamic
• nodes leaving/joining cluster based on load
• polls Kubernetes Metadata API to connect new nodes

12. -Me
“Now it’s time for a live demo!”

13. Development Cycle
• install Docker
• clone the repo
• docker-compose up
• once code is pushed notifies CircleCI and ShipIt

14. Continuous Integration
• run linter
• run tests
• build Docker image and push to AWS Elastic Container Registry

18. ShipIt
• a rails app to coordinate deploys
• compatible with any ad-hoc deploy script or command (Ansible or
Kubernetes)
• sets secrets from encrypted JSON safely committed into our repos

19. Links To ShipIt projects
• https://github.com/Shopify/shipit-engine
• https://github.com/Shopify/kubernetes-deploy
• https://github.com/Shopify/ejson

20. The End