This document summarizes Emilien Macchi and Sébastien Han's work on improving high availability in OpenStack. It discusses their contributions of Pacemaker resource agents and documentation updates. It also describes their experiences implementing OpenStack in a medium public cloud, noting challenges of scalability and split brains risks. Lastly, it outlines work to improve networking high availability and testing the cell architecture for horizontal scaling.

1. High Availability in
OpenStack
from DevOops! side
Emilien Macchi, Sébastien Han
Cloud Engineers @ eNovance

2. whoarewe
Seb Emile
- DevOps - DevOps
- Ceph Specialist - Doc Contributor
- Blogger - Quantum Fanatic

3. Agenda
Contributions
Pacemaker Resource Agents
Official Documentation
Puppet Modules
Experiences
Medium Public Cloud
Large Public Cloud
Look further

4. Contributions

5. Pacemaker Resource Agents
- Essex / Folsom / Grizzly
- Covers SPOF services
- Future: no future
Download them all!
https://github.com/madkiss/openstack-resource-agents

6. Official Documentation
- Active / Passive mode
- MySQL
- RabbitMQ
- OpenStack APIs
- Need contributors
- Future: Active / Active
RTFM !
http://docs.openstack.org/trunk/openstack-ha/

7. Puppet Labs
- Update modules for Grizzly
- Nova | Cinder | Quantum are HA aware
- Make modules for HA deployments
(Work in Progress)

8. Experiences

9. Use case #1: Medium-Size Public Cloud

10. coming soon

11. Feedback
✓ Easy and fast deployment (with Puppet)
✓ Enough for our needs
✗ Not scalable enough
✗ Split brains risks
✗ DRBD?
Can be improved:
Migrate to Grizzly, change for active / active
...

12. Use case #2: Large-Size Public Cloud

14. Feedback
✓ Highly scalable
✓ Maintenance
✓ The Network scheduler allows us to scale
L3
✗ Networking: L3 is not HA
✗ OVS plugin does not scale (L2 isolation)
In progress : testing cells

15. To infinity... and beyond

16. Newcomers
- Nova-conductor (horizontal scaling)
- Ceilometer improvements
- Quantum Load Balancing & Metadata agents

17. Des questions ?
E-mail : emilien@enovance.com
IRC : EmilienM
Twitter : @EmilienMacchi
Blog : http://my1.fr/blog
E-mail : sebastien@enovance.com
IRC : leseb
Twitter : @sebastien_han
Blog: http://sebastien-han.fr/blog