TDD for Devops A whirlwind tour of how to manage server configuration and maintain this unit tests

1. Teting Infratructure Code
TDD for DevOp

2. Kieran Johnon
@kieranj

3. The Prolem

4. Snowflake Server
Unique
Fragile
Unpredictale

5. Configuration Management
Automate the configuration of erver
ail reproduce an environment
Verion controlled

6. Configuration Management
Tool

8. Anile
YAML
Simple, declarative ntax
Powerful
Agentle
Puh aed
Galax ­ Communit role

9. Module
File
Template
Package
Network
Stem
Cloud Provider
Dataae
Source Control
Monitoring

10. Anile Terminolog
Tak
Role
Plaook
Inventor

11. Inventor
Static or dnamic
Can e pecified a a file or a cript
Group erver into role/environment

12. Inventor xample
[web]
10.0.1.7
[prime]
10.0.2.5 replication=yes
[slaves]
10.0.2.3
10.0.1.9
[database:vars]
replication_user=replicator
wal_level=replica
[databases:children]

13. xample Anile Tak
- hosts: web
tasks:
- name: Install Dependencies
become: yes
apt:
pkg: "{{ item }}"
state: installed
update_cache: true
with_items:
- build-essential

14. Change
Something change and uddenl ou're pending
hour deugging
You could SSH into our erver, grep log file etc
ut that time conuming
We hould catch the error efore uing the
plaook

15. Unit Tet
If we were upgrading a application we'd have unit
tet to run after changing the code
So let write unit tet for our erver configuration

16. Unit tet for erver
configuration
Verif the expected configuration after the
proviioner ha run
Run our tet on CI and e ure aout the code
that proviion our erver

17. Tool
Tet Kitchen
Server Spec

18. Tet Kitchen
http://kitchen.ci

19. Tet Kitchen
Tet harne for executing configuration code
Support multiple drive for running the code locall
or in the cloud (C2, DO, Vagrant, Docker etc)
Support multiple framework for teting (Server
Spec, ATS, hunit2)
Run tet on multiple platform, e.g. Cento, Uuntu,
Deian

20. Server Spec
http://erverpec.org

21. Server Spec
RSpec matcher for erver configuration
Tet erver tate locall or via SSH, WinRM ­ not
need for an additional oftware

22. Aertion
File
Service
Interface
Port
Cron
Permiion
Iptale
Package
Uer/Group

23. Server Spec xample
describe service('nginx') do
it { is_expected.to be_running }
end
describe command('gem list') do
its(:stdout) { is_expected.to contain('bundler') }
end

24. xample

25. Demo

26. Quetion