Open Stack

Hi,

On 31/01/13 22:30, Vishvananda Ishaya wrote:
>
> On Jan 31, 2013, at 12:17 PM, Stephen Gran<stephen.gran at guardian.co.uk>  wrote:
>
>> Hello,
>>
>> At work we use the EC2 tags API quite heavily for all sorts of things,
>> so I've been tasked with getting it implemented for openstack.
>>
>> As some background, the EC2 API offers 3 API calls: CreateTags,
>> DeleteTags and DescribeTags, as well as a way to filter a search for a
>> resource by tags (by passing {"filter": [{"tag:key": "value"}]} or
>> {"filter": [{"tag-key": "value"}]} as parameters to an API call like
>> DescribeInstances or DescribeSecurityGroups.
>>
>> The API references are here:
>> http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-CreateTags.html
>> http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-DeleteTags.html
>> http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-DescribeTags.html
>> http://docs.aws.amazon.com/AWSEC2/latest/APIReference/ApiReference-query-DescribeInstances.html
>> (and other Describe* resource searches)
>>
>> The part of this that seems awkward to overlay onto openstack's database
>> schema is that tags can be applied to multiple resource types - eg, when
>> a stack is cloudformed, all the instances, load balancers, security
>> groups, etc are tagged with the cloudformation name.
>>
>> I can see two ways of implementing this:
>>
>> 1) Reuse the existing instance-metadata table and start creating
>> security-group metadata tables and so on.  This approach has the
>> downside that resources that are served by cinder or quantum will be
>> awkward - we'd have to add equivalent API calls to them and call their
>> API.
>
> It seems like the openstack api needs to grow support for metadata on all objects, so
> I think adding api calls is the right long term goal.
>
> Thanks for bringing this up. I'm leaning towards 1 even though it will be more work.

This is awaiting review at https://review.openstack.org/#/c/23256/ (and 
a related one at https://review.openstack.org/#/c/23258/).  I'd 
appreciate people giving them the once over.

These patches only expose the existing metadata in nova via the EC2 API 
and allow filtering on tags in searches.  I think I've left it 
extensible so that other types of metadata can be easily added later.

Cheers,
-- 
Stephen Gran
Senior Systems Integrator - guardian.co.uk
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