This document discusses running Kubernetes and Drupal 8 on a cluster of Raspberry Pis. It begins by asking how well Kubernetes can run on a cluster of small, credit-card sized computers like Raspberry Pis. It then provides a brief overview of what Kubernetes is and how it manages applications and services running on multiple servers. The document goes on to describe a demo of running Kubernetes and Drupal 8 on a Raspberry Pi cluster and notes it was about 20-50% slower than a single MacBook Pro. It closes by discussing some challenges of using a Raspberry Pi cluster with Kubernetes and points to additional resources on the topic.

1. Everything I know about
Kubernetes I learned from
a cluster of Raspberry Pis
Jeff Geerling, Senior Technical Architect @ Acquia
(geerlingguy)

2. http://www.shockinglydelicious.com/dorothys-fresh-raspberry-pie-recipe/

3. The Big Question
What can I do with my
Raspberry Pi?

4. The Big Question
How well does Kubernetes run on a
cluster of credit-card sized computers?

5. The Big Question
How well does Drupal 8 run on Kubernetes
on a cluster of credit-card sized computers?

6. But BEFORE all that
What the heck is Kubernetes?

7. You have applications and services you need to run.
Drupal
RedisMySQL
Solr
Logs
Chat
Cron
You have a bunch of servers to run them on.

8. Kubernetes puts things on servers
Drupal
Redis
MySQL
Solr Logs
Chat
Cron
...and makes sure they keep running.

9. See also:
Return of the Clustering: Kubernetes for Drupal
(from Tess Flynn / @socketwench, yesterday!)

11. Source: http://uncyclopedia.wikia.com/wiki/File:OMGWTFBBQ!.jpg

14. RIP: 2014-2017
RIP: 2015-2016

15. 2019-TBD

16. Problem
How do you put Kubernetes and
Drupal on a cluster of Raspberry Pis?

17. “Configuration management for humans.”
___________
< And cows! >
-----------
^__^
(oo)_______
(__) )/
||----w |
|| ||

18. Demo

19. So how is it?

20. For comparison:
• My (single) MacBook Pro: 20-50% slower*

21. ! Home-as-a-Datacenter
• Where will you keep the Pi?
• 🔌 Power, 🌐 Network, 🔐 Physical security
• Who will maintain the Pi?
• What happens if you get 📈
Slashdotted/Hacker News'ed/Reddit Hugged?

22. ! Kubernetes
• Requires more rigor: deployment, automation
• RBAC missteps can lead to major security holes 🤦
• Stateful is still not easy (storage, DBs)
• Need a dictionary 📕
• Done well, can do amazing things
• Done poorly, "failure at web scale"

23. The Big Question
How well does Drupal 8 run on Kubernetes
on a cluster of credit-card sized computers?

24. Resources
• Raspberry Pi Dramble
• Drupal for Kubernetes
• Drupal Pi (Single Pi)
• Ansible for DevOps
• Jeff Geerling's Blog