Default-Image-Id

[Marco Ceppi]

I think it is and was depreciated based on a decision made at either UDS-Q
or UDS-R. The topic came up during what should be included in machine
constraints. As I recall there was a bit of discussion but the end result
was that support different image-id's was a bad implementation of the
machine constraints as most anything you could add at the image level could
be achieved with a charm. The idea is to provide a consistent base that is
mostly universal between all charms and that base as it became was the
cloud images. The logistics of questions like "how do we handle charms that
need custom images", and the like, become far more complex to support than
what we currently have. I think at this point it might be worth a
discussion again but I agree with the original decision to remove it from
pyjuju and would be an advocate for not implementing it in future versions.
I will hunt through the etherpads to find the session that this came up in
if anyone is interested in the reference.

Thanks,
Marco Ceppi


On Mon, Apr 22, 2013 at 12:32 AM, Tim Penhey <tim.penhey at canonical.com>wrote:

> On 22/04/13 16:29, Ian Booth wrote:
> > Hi
> >
> > On 22/04/13 13:41, anirup dutta wrote:
> >> Hey Ian,
> >>
> >> Thanks for the information. I am kind of surprised because, the earlier
> >> versions of Juju allowed specifying a user defined default image by
> putting
> >> it up in the environmental configuration (
> >> https://juju.ubuntu.com/docs/provider-configuration-ec2.html) so I
> didn't
> >> expect the feature to be removed. Good to hear that it is making a
> >> comeback.
> >>
> >
> > The documentation you refer to is for the old Python version of juju,
> which is
> > being replaced in 13.04 with a version written in Go. Both versions will
> be able
> > to co-exist but the Go version is the way forward. In the new version,
> the use
> > of default-image-id is currently deprecated as a means to explicitly
> choose a
> > specific image to run (that's *my* understanding at least).
>
> I don't think it is deprecated, just not implemented.
>
> Getting constraints right is a big hunk of work, and it is work in
> progress.  I think the development team is in agreement that we should
> support instance-id as a valid constraint as people will want it,
> however it is not currently implemented.
>
>
> Cheers,
> Tim
>
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