René's slides on Ansible

1. CloudStack & Ansible

2. Who am I
● René Moser aka resmo
● Linux System Engineer @ SWISS TXT
● Likes open, simple, distributed, plain
text things

4. SWISS TXT
● Member of Swiss National Broadcast
Association Groups
● IT and Multimedia Solution Provider
● Software Development

5. What We Do
● Swiss CDN
● On Demand and Live Streaming
● Private Swiss Media Cloud
● Ansible DevOps Consulting
● Peta Byte Nearline Storage

6. Know your Audience

7. DevOps
● Scalable
● Reliable
● Reproducible

8. Why Ansible?
● Simple and clean
● Made for production
● Power in your hands!

9. What use Ansible for?
● Server Deployments
● Configuration Management
● IT Orchestration and Automation

10. Automation IRL

11. Ansible @ SWISS TXT?
● Updating CloudStack VRs
● Automating DNS and Monitoring
● Configuration of CDN
● Upgrading CloudStack
● Provision VMs on CloudStack

12. Ansible @ SWISS TXT?
● ~ 3'000 commits
● 7.5 commits per weekday
● Inventory: ~500 nodes (~4094 lines)
● 564 (yaml, j2) files have 21896 lines

13. What is Ansible?
● Command Line tool in Python
● Uses SSH for connection
● No Agents
● Push based, pull possible
● Possible Distributed workflow

14. Welcome to Ansible
● License: GPLv3
● Source: github.com/ansible
● Started: ~ 2012
● >1200 contributors
● Latest: v1.9.4
● Rewritten core v2.0

15. Security?
● Auth: SSH public keys, LDAP, password
● Does not need root
● Can do sudo

17. Inventory
● Contains your node definition
● ini-style plain text file
● Dynamic from LDAP, DB, cloud as JSON

18. Inventory
● Contains your node definition
● ini-style plain text file
● Dynamic from LDAP, DB, cloud as JSON

19. Inventory ini style

20. Modules
● Batteries included
● Used for executing tasks
● Core: apt, yum, copy, template, cron,
user, service …
● Extras: Zabbix, OpenStack,
CloudStack ...
● Currently ~500

21. Run modules?
● ad-hoc mode: one task at a time
ansible -m yum -a 'pkg=httpd
state=latest' webservers

22. Run modules?
● Multiple modules as tasks in
playbooks
ansible-playbook webservers.yml

23. Playbooks?
● Written in YAML
● Playbook contains plays
● Play targets hosts
● Play contains tasks

24. Playbook Anatomy

25. Inventory ini style

26. Demo

27. CloudStack Modules
● 21 Modules
● Included in v2.0
● Integration tested

28. Why CloudStack Modules?
● Handles idempotence
● Regions support
● Reuse API response in your play

29. CloudStack Demo 1
● zero to hero
● web application to a public cloud in
minutes

30. CloudStack Demo 2
● Load balanced web application
● Make some maintenance one members

31. Nice isn't it?

32. Links
● Guide: http://docs.ansible.com/ansible/guide_cloudstack.html
● Docs: http://docs.ansible.com
● Example: https://github.com/resmo/ansible-cloudstack-example

33. Questions?

34. Thank you!
● Apache: resmo@apache.org
● Twitter @resmo79
● GitHub: github.com/resmo
● IRC: resmo
● Blog: resmo.ch
● GPG: 0x8306965BE6D6331D