Open Stack

Dugger, Sylvain, thanks for your replies.


On Fri, Aug 15, 2014 at 3:55 AM, Sylvain Bauza <sylvain.bauza at gmail.com>
wrote:

> Mmm... I can understand that you perhaps need an external scheduler for
> your own purposes, but I think you can't expect your plugin merged upstream
> for two reasons :
> - during Icehouse, there was an effort for not having the scheduler
> proxying to the compute nodes
> - Call for scheduler needs to go thru Nova-api and no endpoints are there
> got just scheduling
>
> That said, once Gantt will be lifted, discussing about possible endpoints
> sounds reasonable to me.
>
> -Sylvain
>
> Le 14 août 2014 05:07, "zhiwei" <zhiweik at gmail.com> a écrit :
>
> >
> > Hi Jay.
> >
> > The case is: When heat create a stack, it will first call our
> scheduler(will pass image_id), our scheduler will get image metadata by
> image_id.
> >
> > Our scheduler will build a placement policy through image metadata, then
> start booting VM.
> >
> >
> > Thanks.
> >
> >
> > On Thu, Aug 14, 2014 at 10:28 AM, Jay Pipes <jaypipes at gmail.com> wrote:
> >>
> >> On 08/13/2014 10:22 PM, zhiwei wrote:
> >>>
> >>> Thanks Jay.
> >>>
> >>> The scheduler plugin is not a scheduler filter.
> >>>
> >>> We implemented a scheduler instead of using nova native scheduler.
> >>
> >>
> >> OK. Any reason why you did this? Without any details on what your
> scheduler does, it's tough to give advice on how to solve your problems.
> >>
> >>
> >>> One of our scheduler component need to fetch image metadata by
> image_id(
> >>> at this time, there is not instance ).
> >>
> >>
> >> Why? Again, the request_spec contains all the information you need
> about the image...
> >>
> >> Best,
> >> -jay
> >>
> >>> On Thu, Aug 14, 2014 at 9:29 AM, Jay Pipes <jaypipes at gmail.com
> >>> <mailto:jaypipes at gmail.com>> wrote:
> >>>
> >>>     On 08/13/2014 08:31 PM, zhiwei wrote:
> >>>
> >>>         Hi all,
> >>>
> >>>         We wrote a nova schedule plugin that need to fetch image
> metadata by
> >>>         image_id, but encountered one thing, we did not have the glance
> >>>         context.
> >>>
> >>>         Our solution is to configure OpenStack admin user and password
> to
> >>>         nova.conf, as you know this is not good.
> >>>
> >>>         So, I want to ask if there are any other ways to do this?
> >>>
> >>>
> >>>     You should not have to do a separate fetch of image metadata in a
> >>>     scheduler filter (which is what I believe you meant by "plugin"
> above?).
> >>>
> >>>     The filter object's host_passes() method has a filter_properties
> >>>     parameter that contains the request_spec, that in turn contains the
> >>>     image, which in turn contains the image "metadata". You can access
> >>>     it like so:
> >>>
> >>>       def host_passes(self, host_state, filter_properties):
> >>>           request_spec = filter_properties['request___spec']
> >>>
> >>>           image_info = request_spec['image']
> >>>           # Certain image attributes are accessed via top-level keys,
> like
> >>>           # size, disk_format, container_format and checksum
> >>>           image_size = image_info['size']
> >>>           # Other attributes can be accessed in the "properties"
> collection
> >>>           # of key/value pairs
> >>>           image_props =  image.get('properties', {})
> >>>           for key, value in image_props.items():
> >>>               # do something...
> >>>
> >>>     Best,
> >>>     -jay
> >>>
> >>>
> >>>
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