Open Stack

On 12/17/2018 10:46 AM, Stephen Finucane wrote:
> Secondly, I didn't see anything in the
> likes of cinder, nova or neutron but has anyone else already worked on
> something like this? For what it's worth, I did explain why I've gone
> with the approach I have in the commit message, but that doesn't mean
> there aren't other options I could be missing.

When Markus Zoeller was originally doing the nova config option cleanup 
[1] which included centralizing everything under nova/conf/ and also 
updating the documentation on all options to have a standard format, he 
also included a list of which services used each option. Over time that 
was dropped, presumably because (1) it's hard as hell to maintain with 
as many options as nova has and as much code motion that nova has and 
(2) it's hard to know if it is useful at all given I expect most people 
are pushing config option changes to a single nova.conf that gets pushed 
to all of their services (there are especially some options which simply 
don't work if they aren't in nova-api and nova-compute for example 
[reclaim_instance_interval]). John Garbutt and/or Michael Still might 
remember more, but that's my recollection.

So I'd rather not re-open this can of worms. If a particular option or 
set of options are hairy with service configuration, then call those out 
specifically in the help for those options.

Having said that, I recently helped someone in IRC who couldn't figure 
out how to get vendor data from the metadata API into the config drive 
and it was because they weren't setting some metadata API config options 
in nova-compute where the config drive is built. That was likely due to 
confusion because the "vendordata_jsonfile_path" option in nova is in 
the [api] group which would naturally make one think that's only needed 
in nova-api, but it's also used in nova-compute when building a config 
drive. As a result, I opted to cleanup the help and our docs [2].

Anyway, I think we've got wayyyyy bigger problems to solve than dig back 
into a multi-release effort to document where all of our config options 
are used.

[1] 
https://specs.openstack.org/openstack/nova-specs/specs/mitaka/implemented/centralize-config-options.html
[2] https://review.openstack.org/#/c/624518/

-- 

Thanks,

Matt