From OpenStack Day UK 2017. A discussion about live-migration bugs and how they were contributed to upstream OpenStack.

1. How can I get more
involved with OpenStack?
John Garbutt
@johnthetubaguy
Principal Engineer, StackHPC

2. @johnthetubaguy’s OpenStack Journey

3. Yes, I do play the Tuba...

4. Question:
How do I get this commit upstream?

5. Question:
How do I get this commit upstream?

6. Question:
How do I fix my problem upstream?

7. How I think my solution fits upstream...
My Solution

8. How upstream views itself
Long term vision Current State

9. What if we compare those two views?
My Solution
Internal View Upstream View

10. After talking about the problem...
Joint Solution

12. Problem First,
Solution Second

13. Deep Dive:
OSIC Live-migration Bugs

14. Virtual
Machine
Disk
Remote
Local
Network
CPU and
Memory

15. Runs at
Source
• Setup and/or
Sync disk
• Iterative pre-
copy of memory
Paused
• Estimate
downtime
• Stop and
copy memory
Runs at
Destination
• Activate
network
• Tidy up
source

16. Bugs we found
● Stuck Migrating
● Race in call to undefine_domain
● Timeouts (waiting block migration)

17. Why could we fix them now?
● Ability to reproduce the failure
● Got the “correct” logs to pinpoint the error
● Ability to test the fixes

18. Did you spot the common theme?

19. You never really understand a person
until you consider things from his point
of view … until you climb into his skin
and walk around in it.
To Kill a Mocking Bird
By Harper Lee

20. What can I do?

21. Contribution Frequency
One Off Infrequent Regular

22. Next steps...
● Come meet the OpenStack community
● Fix that confusing bit in the docs
● Submit that bug report
● Upload that little bug fix
● Help with reproduction, logs and testing fixes
● Review a Specification that interests you
● Ask me a question

23. @johnthetubaguy
@StackHPC

24. What does contributing look like?

25. OpenStack Process
Idea
PTG,
Forum
Spec
Blueprint
Bug
ML, IRC
Git
Tempest Gerrit

26. Demystify Roles
● Contributor = Everyone who helps the OpenStack community
● PTL = Project Team Lead, previously Project Technical Lead
● PTG = Project Team Gathering, in person discussions
● Core = Core Reviewer: has +2 and +W permissions in gerrit
● CPL = Cross Project Liaison
● Czar = Someone driving some effort forward
● TC = Technical Committee