Bundles proposal

[roger peppe]

On 19 June 2014 18:02, Benjamin Saller <benjamin.saller at canonical.com> wrote:
> Some of my recent work with charming Cloud Foundry has led us towards a
> slightly different understanding of bundles. In the case of something like
> cloud foundry the topology will change between releases of their code, in
> version 'b' they might add a new service that 'a' didn't have and in 'c'
> they might replace two existing components with a new one that subsumes
> them. In cases like this being able to preserve identity in the runtime is a
> very interesting feature of 1st class bundle support. Right now a bundle IsA
> topology but in our depiction it HasA topology. While I have no proof that
> service spanning identity that survives mutation is general enough to inform
> these requirements it really is something we want to deal with.

This is very interesting, and definitely deserves further discussion.

> I also understand that in some world views a bundle would represent a
> supportable collection of services and this might imply the topology is
> fixed but any complex system that evolves is likely to have some topology
> mutation. While we can manage this without first class support it would be
> difficult to expect the GUI to the the 'right' thing for our project unless
> bundles include this idea.

What support would you expect or like to see in the bundle format
for this kind of thing? Note that currently the format specifies
a topology, but does not state how that topology should be
mapped to an existing environment (that aspect is left deliberately
unspecified for now).

  cheers,
    rog,


> Thanks,
> -Ben
>
>
> On Thu, Jun 19, 2014 at 6:28 AM, roger peppe <rogpeppe at gmail.com> wrote:
>>
>> We (mostly myself and Francesco Banconi, with some useful
>> input from Brad Crittenden) have put together a proposal for moving
>> towards making bundles a first-class citizen in Juju.
>>
>> Please let us know what you think.
>>
>>
>> https://docs.google.com/a/canonical.com/document/d/1SF8hTBi6oVbki8V__beNij6wnQU-5cm6PZsy5gf0j_Y/edit
>>
>>  cheers,
>>     rog.
>>
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