Open Stack

Hey all,

During the summit session on the the VMWare driver roadmap, a topic of
validating the passed configuration prior to starting services came up
(see [1] for more detail on how it's connected to that specific topic).

Several ideas were thrown around during the session mostly documented in
[1].

There are a few more cases when something like this could be useful (see
bug [2] and related patch [3]), and I was wondering if a slightly
different approach might be useful. For example use an already existing
validation hook in the service class [4] to call into a validation
framework that will potentially stop the service with proper
logging/notifications. The obvious benefit would be that there is no
pre-run required from the user, and the danger of running a
misconfigured stack is smaller.

Since there is already a blueprint raised based on the etherpad [1]- I
am bringing this up here so that we can agree on the approach, before
raising another one to solve the same problem.

Thanks,

Nikola

[1] https://etherpad.openstack.org/p/T4tQMQf5uS
[2] https://bugs.launchpad.net/nova/+bug/1243614
[3] https://review.openstack.org/#/c/53303/
[4] http://git.openstack.org/cgit/openstack/nova/tree/nova/service.py#n283