1. Containers Patterns for Rails
Jairo Diaz @codescrum
London Ruby User Group
Sep 2015

2. Overview
● Pets vs Cattle
● Containers vs Virtual Machines
● Running Rails on Containers
○ Docker compose
○ Kubernetes

3. Pets vs Cattle
● Pets are given names
● They are unique, lovingly hand
raised
● When they get ill, you nurse
them back to health
● Cattle are given numbers
● They are almost identical to
other cattle
● When they get ill, you get
another one

4. Containers vs Virtual Machines

5. Docker: A happy family!
Docker
Go Language
Linux
Docker Engine
Docker Machine
Docker Compose
Docker Hub

6. Mac OS Setup for Docker
rais-image
Local environment
Docker Machine (with daemon)
db-image
rais-app-1
rais-app-2
db
ruby-image
ruby-image
db-image
other-image
Docker Hub
(On the Internet)
Dockerfile

7. Rails with Docker Compose

8. Rails with Docker Compose
File: docker-compose.yml (½)

9. Rails with Docker Compose
File: docker-compose.yml(2/2)

10. Rails with Kubernetes
rais-image
Local environment
Kubernetes Minion
db-image
rais-app-1 rais-app-2
db
ruby-image Kubernetes
Master
APIs
Replication
Controller
Scheduler
etcd
Kubelet
Proxy
Replication Controller
Web Service
Db Service
Replication Controller
CLI

11. More information:
Code examples at:
http://github.com/codescrum/
Blog post on docker compose:
http://blog.codescrum.com/
Get in touch with Jairo Diaz @codescrum