Defining service-unit level relationships in charms

[Denis Weerasiri]

On Fri, Nov 9, 2012 at 12:03 PM, Denis Weerasiri <ddweerasiri at gmail.com>wrote:

> On Mon, Nov 5, 2012 at 8:00 PM, Bruno Girin <brunogirin at gmail.com> wrote:
>
>>  Denis,
>>
>> You could do that by deploying individual services:
>>
>> juju deploy ServiceA ServiceA-unit-1
>> juju deploy ServiceA ServiceA-unit-2
>> juju deploy ServiceA ServiceA-unit-3
>>
>> juju deploy ServiceB ServiceB-unit-1
>> juju deploy ServiceB ServiceB-unit-2
>> juju deploy ServiceB ServiceB-unit-3
>>
>> juju add-relation ServiceA-unit-1 ServiceB-unit1
>> juju add-relation ServiceA-unit-1 ServiceB-unit2
>> ...
>>
>> But of course that is very long-winded and not very scalable. Why do you
>> want to do this in the first place? There may be an easier way to achieve
>> the final goal than decomposing the unit relationship.
>>
> Hi folks,
> Sorry for the delay.
> I was thinking of this service topology with the consideration
> of geographic location of each service unit.
>
>    1. Suppose ServiceA is a application server and ServiceB is a data
>    source.
>    2. So each application server is suppose to write to two data source
>    nodes (primary and backup) which are deployed in two geographic locations.
>
> Adding more clarifications to the picture
[image: Inline image 1]

> So in that case don't we need to declare service-unit level relationship?
>
>
>> Cheers,
>>
>> Bruno
>>
>>
>> On 05/11/12 02:03, Denis Weerasiri wrote:
>>
>> I suppose using hook commands (like relation-get ip), I can get some
>> notion of the other side of the relation.
>> But still I think it's impossible to define a restricted relationship
>> such as ServiceA-Unit-1 should only relate with ServiceB-Unit-1
>> and ServiceB-Unit-2, but not with ServiceB-Unit-3.
>>
>> On Mon, Nov 5, 2012 at 12:10 PM, Denis Weerasiri <ddweerasiri at gmail.com>wrote:
>>
>>> Hi,
>>> I'm trying to analyse the charm specification. Suppose there are two
>>> services (ServiceA and ServiceB) where ServiceA *require *2
>>> service-units of ServiceB. In such a deployment  is it possible to define
>>> ServiceA-Unit-1 should relate to ServiceB-Unit-1 and ServiceB-Unit-2 (as I
>>> have sketched below)?.
>>>  [image: Inline image 1]
>>>
>>>  --
>>> Thanks,
>>> Denis
>>> ----------------------------------------------------------
>>> *Denis Weerasiri*
>>> *
>>> *
>>> *site: **https://sites.google.com/site/ddweerasiri/*<https://sites.google.com/site/ddweerasiri/>
>>> *blog: **http://ddweerasiri.blogspot.com*<http://ddweerasiri.blogspot.com/>
>>> *
>>> twitter: **http://twitter.com/ddweerasiri*<http://twitter.com/ddweerasiri>
>>> *
>>> linked-in: **http://lk.linkedin.com/in/ddweerasiri*<http://lk.linkedin.com/in/ddweerasiri>
>>>
>>>
>>
>>
>>  --
>> Thanks,
>> Denis
>> ----------------------------------------------------------
>> *Denis Weerasiri*
>> *
>> *
>> *site: **https://sites.google.com/site/ddweerasiri/*<https://sites.google.com/site/ddweerasiri/>
>> *blog: **http://ddweerasiri.blogspot.com*<http://ddweerasiri.blogspot.com/>
>> *
>> twitter: **http://twitter.com/ddweerasiri*<http://twitter.com/ddweerasiri>
>> *
>> linked-in: **http://lk.linkedin.com/in/ddweerasiri*<http://lk.linkedin.com/in/ddweerasiri>
>>
>>
>>
>>
>>
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>>
>
>
> --
> Thanks,
> Denis
> ----------------------------------------------------------
> *Denis Weerasiri*
> *
> *
>  <http://wso2.com/>**** <http://wso2.com/>*site: **
> https://sites.google.com/site/ddweerasiri/*<https://sites.google.com/site/ddweerasiri/>
> *blog: **http://ddweerasiri.blogspot.com*<http://ddweerasiri.blogspot.com/>
> *
> twitter: **http://twitter.com/ddweerasiri*<http://twitter.com/ddweerasiri>
> *
> linked-in: **http://lk.linkedin.com/in/ddweerasiri*<http://lk.linkedin.com/in/ddweerasiri>
>
>


-- 
Thanks,
Denis
----------------------------------------------------------
*Denis Weerasiri*
*
*
 <http://wso2.com/>**** <http://wso2.com/>*site: **
https://sites.google.com/site/ddweerasiri/*<https://sites.google.com/site/ddweerasiri/>
*blog: **http://ddweerasiri.blogspot.com* <http://ddweerasiri.blogspot.com/>
*
twitter: **http://twitter.com/ddweerasiri* <http://twitter.com/ddweerasiri>*
linked-in: **http://lk.linkedin.com/in/ddweerasiri*<http://lk.linkedin.com/in/ddweerasiri>
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