1. Test Driven Infrastructure
Bringing Software Development Techniques to Operations
Alejandro González Pérez
Ebury -

2. Infrastructure as Code: Why?
- Reproducible Results
- Avoid Snowflake Servers
- Testable
- Automate deploy & Recovery process
- Easier autoscaling
- Versioning 2

3. Infrastructure as Code: What we want to avoid3

4. Infrastructure as Code: Principles
- Write definition files to define your infrastructure
- Keep it in VCS: Git, SVN, Mercurial, etc.
- Self documented process
“Treat your servers as cattle, not pets”
It’s need testing. 4

5. Test Driven Infrastructure
Why TDI?
- The earlier we found the bug the cheaper
- Focus on the code you need
- Code Quality
We need to bring techniques from Software Developers Teams and TDD it’s a great example. 5

6. TDI 6

7. Testing your Infrastructure
- Why we need to add tests to infrastructure?
Because It’s code.
- What to test?
I’m not asking you to test everything, just complex situations that can escape to your control. 7

8. TDD / TDI Diagram 8

9. Test Pyramid 9

10. Avoiding an Unbalanced Test suite10

11. Test Pyramid: Low-level tests11

12. Low level tests – Static analysis– Ansible
- Ansible Lint -
- Ansible-playbook -- check and -- diff options 12

13. Low level tests – Other Options13

14. Test Pyramid: Medium-level tests14

15. Medium Level Tests: Inspec
- Testing framework
- Written in ruby
- Human Readable Syntax
- You can run your tests via: local, ssh ,winrm or docker 15

16. Medium Level Tests: Inspec basic usage
How to install?
- inspec init profile [Profile Name]
- inspec exec [folder] [-t target] 16

17. Medium Level Tests: Inspec Syntax17

18. Medium Level Tests: Inspec syntax18

19. Medium Level Tests: Inspec resources
- Around 100 different resources
- System: service, crontab, port, etc.
- Specific software config file checking: nginx_conf, mysql_conf, etc.
- File parsing, XML, Yaml, json, etc.
If none of those suits you, you can use “bash” or “command” 19

20. Test Pyramid: High-level tests20

21. High-level tests: Inspec21

22. High-level tests: Testing your cloud
Awspec: 22

23. Test Pyramid: Summary 23

24. Integrate it with your workflow24

25. Integrate it with your workflow: Ebury Example25

26. Testing Frameworks 26

27. Summary
Test your code. 27

28. Testing your Infrastructure
Resources:
- Infrastructure as Code
- Inspec io Official Documentation
- Ansible Official documentation
- Puppet:
- FoodCritic:
- Test Driven Development
- Molecule:
- KitchenCI: 28

29. Demo

30. Questions?

31. THANK YOU!