This document discusses using Ansible to automate the deployment of Drupal 8 on a cluster of Raspberry Pis, called the #Dramble. It begins with an introduction to Ansible and how it can be used to solve problems with growing infrastructure and complex Drupal deployments. It then demonstrates how to define servers in Ansible inventory, run ad-hoc commands, and build playbooks to provision servers and deploy Drupal 8. Benchmarks show the #Dramble can handle over 2,000 requests per second when caching is enabled, but only 14 requests per second without caching. More opportunities for improving Drupal 8 performance on the #Dramble are discussed.

1. Ansible + Drupal
A fortuitous DevOps Match
#MidCamp 2015
Jeff Geerling
Technical Architect, Acquia
________________________________________
/ "Automation shouldn't be your day job"
#ansible #pycon2014 /
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(oo)_______
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2. Who am I?
Jeff Geerling (geerlingguy)
Technical Architect, Acquia
Owner, Midwestern Mac LLC
Dev (mainly)

3. Ansible for DevOps
On LeanPub
Nearly complete!
50% off: http://bit.ly/midcamp-a4d

4. Problems
Growing infrastructure.
Drupal deployments are complex.
More deployments, more downtime.
<insert your problem here>

5. “Configuration management for humans.” (— Me, 2014)
Uses SSH
Secure, fast, simple
Don't need configuration management to manage your configuration
management.

6. Over 270 modules built-in
Over 3,000 roles on Ansible Galaxy
Extensible, modular APIs (JSON, language-agnostic)

7. Installation
Mac: brew install ansible
Python pip: sudo pip install ansible
RHEL/CentOS: sudo yum install ansible
Deb/Ubuntu: sudo apt-add-repository ppa:ansible/ansible
sudo apt-get update
sudo apt-get install ansible

8. Ansible 101
1. Inventory: Describe your infrastructure
2. Ad-Hoc commands: Run one-off tasks
3. Playbooks: "Infrastructure as code"

9. ________________________________________
/ Drupal 8 on a cluster of Raspberry Pis
#dramble /
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(oo)_______
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10. http://robmyers.org/cc-ironies/no_flash_photography_sign/
Please help me avoid the
Xenon Death Flash

11. The #Dramble
CPU 24 cores / 5.4 GHz
RAM 6 GB
Storage 96 GB microSD
Network 10/100 over Gigabit network

13. Inventory
Like a hosts file for Ansible (/etc/ansible/hosts)
INI syntax
[webservers]
www1.pidramble.com
www2.pidramble.com
www3.pidramble.com

14. Inventory
Like a hosts file for Ansible (/etc/ansible/hosts)
INI syntax
[webservers]
www1.pidramble.com
www2.pidramble.com
www3.pidramble.com
Group
Servers in group

15. Ad-Hoc commands
Test Ansible's connection with the ping module.
$ ansible webservers -m ping

16. Ad-Hoc commands
Test Ansible's connection with the ping module.
$ ansible webservers -m ping
Group
Module

19. Ad-Hoc commands
Have fun with RGB LEDs!
$ ansible webservers -a "rgb red" -s

20. Ad-Hoc commands
Have fun with RGB LEDs!
$ ansible webservers -a "rgb red" -s
Group
'Use sudo'
Command

21. ________
< Shiny! >
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^__^
(oo)_______
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22. Ad-Hoc commands
$ ansible webservers -a "sudo apt-get install php5-common"

23. Ad-Hoc commands
$ ansible webservers -m apt -a "name=php5-common state=installed" -s
Module Arguments

24. Playbooks
Ad-Hoc commands don't solve the
snowflake problem
"infrastructure as code"
Simple YAML files
Run with: ansible-playbook
Unique, by Pen Waggener

25. Playbooks
---
- hosts: webservers
sudo: yes
tasks:
- name: Ensure PHP is installed.
apt: name=php5-common state=installed

26. Playbooks
---
- hosts: webservers
sudo: yes
tasks:
- name: Ensure PHP is installed.
apt: name=php5-common state=installed
Group
Module
Documentation
Arguments

27. Playbooks
Includes: include playbooks in other playbooks
Variables: flexible - defaults and easy overrides
Templates: use Jinja2 (Twig-like syntax!)
Roles: encapsulate 'chunks' of configuration (like PHP classes)

28. Back to the #Dramble
“Drupal 8 on a cluster
of Raspberry Pis”

29. Architecture

30. Architecture

31. Architecture

32. Architecture

33. Architecture
---
- hosts: database
sudo: yes
vars_files:
- ../vars.yml
- vars.yml
roles:
- geerlingguy.firewall
- geerlingguy.mysql
- geerlingguy.munin-node
- ../roles/leds
Fully functioning MySQL server
in 13 lines of YAML!

34. Provisioning the Servers
No live demo: "Never rely on Conference WiFi"
But we can talk about it later :-)

35. Deploying Drupal 8
Demo
See: raspberry-pi-dramble on GitHub

36. Deploying Drupal 8
1. First deploy: install
$ ansible-playbook main.yml
2. Second deploy: update, import config, rebuild caches
$ ansible-playbook main.yml --extra-vars "drupal_version=1.1.1"
3. Third deploy: enable Redis
$ ansible-playbook main.yml --extra-vars "drupal_version=1.1.1
drupal_redis_enabled=true"

38. $ wrk -t4 -c100 -d20 http://pidramble.com/
Running 20s test @ http://pidramble.com/
4 threads and 100 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 45.19ms 21.19ms 350.10ms 89.04%
Req/Sec 555.98 43.24 804.00 92.67%
44183 requests in 20.00s, 222.31MB read
Requests/sec: 2209.20
Transfer/sec: 11.12MB
$ wrk -t4 -c24 -d20 http://pidramble.com/?nocache=true
Running 20s test @ http://pidramble.com/?nocache=true
4 threads and 24 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 1.62s 240.73ms 2.16s 63.33%
Req/Sec 3.10 0.61 4.00 63.33%
288 requests in 20.03s, 1.45MB read
Socket errors: connect 0, read 0, write 0, timeout 10
Requests/sec: 14.38
Transfer/sec: 73.89KB
Cached req/s:
2209.20
Uncached req/s:
14.38

39. ____________________________________
/ Drupal 8 is scalable, but not fast
...yet. /
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40. MORE DRAMBLE!
Tons of benchmarks
D8 performance and deployment discovery
See the Raspberry Pi Dramble Wiki

41. MORE ANSIBLE!
Docker integration
AWS, DigitalOcean, Rackspace, Softlayer, Linode, etc.
Notifications
Rolling updates
Ansible Vault
Dynamic inventory
etc...

42. Resources
• Ansible documentation
• Ansible Vagrant examples
• Ansible for DevOps
• Raspberry Pi Dramble

43. Feedback
• https://joind.in/13825
• Speaker name: @geerlingguy
• #MidCamp
• #Dramble
50% off Ansible or DevOps:
http://bit.ly/midcamp-a4d