[openstack-dev] [all] HA cross project session summary and next steps

Angus Salkeld asalkeld at mirantis.com
Tue Nov 11 02:13:18 UTC 2014

Hi all

The HA session was really well attended and I'd like to give some feedback
from the session.

Firstly there is some really good content here:

1. We SHOULD provide better health checks for OCF resources (
These should be fast and reliable. We should probably bike shed on some
convention like "<project>-manage healthcheck"
and then roll this out for each project.

2. We should really move
https://github.com/madkiss/openstack-resource-agents to stackforge or
openstack if the author is agreeable to it (it's referred to in our
official docs).

3. All services SHOULD support Active/Active configurations
    (better scaling and it's always tested)

4. We should be testing HA (there are a number of ideas on the etherpad
about this)

5. Many services do not recovery in the case of failure mid-task
    This seems like a big problem to me (some leave the DB in a mess).
Someone linked to an interesting article (
crash-only-software: http://lwn.net/Articles/191059/)
<http://lwn.net/Articles/191059/> that suggests that we if we do this
correctly we should not need the concept of clean shutdown.
     I'd be interested in how people think this needs to be approached
(just raise bugs for each?).

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