Get number of units

[Charles Butler]

Nice, I like this. +1 Marco

If we have a "tips and tricks" page or charmer snippets, this should live
there.


Charles Butler <charles.butler at canonical.com> - Juju Charmer
Come see the future of modeling your datacenter: http://jujucharms.com

On Wed, Mar 2, 2016 at 6:45 AM, Marco Ceppi <marco.ceppi at canonical.com>
wrote:

> To answer your question anyways, you can do this with the peers relation:
>
> ``` metadata.yaml
> peers:
>     cluster:
>         interface: my-service-cluster
> ```
>
> So, at anytime, in any hook you can do the following:
>
> ``` bash
> rid=$(relation-ids cluster)
> for unit in $(relation-list -r $rid); do
>     echo "It's a  peer and confidant $unit"
> done
> ```
>
> However, since Juju gives unique numbers for each unit, you could use a
> units number to enumerate a port. You wouldn't need the peer relationship
> for this directly. As an example
>
> ``` bash
> port_start=4000
> port=$(expr $port_start + ${JUJU_UNIT_NAME##*/})
> ```
>
> So if it's unit/0 you'll get 4000, if it's unit/10 you'll get 4010, etc.
> Since unit numbers are unique in Juju you'll never get a conflict.
>
> Marco Ceppi
>
> On Wed, Mar 2, 2016 at 6:29 AM Tom Barber <tom at analytical-labs.com> wrote:
>
>> Scrap that, I have an alternative solution!
>>
>> --------------
>>
>> Director Meteorite.bi - Saiku Analytics Founder
>> Tel: +44(0)5603641316
>>
>> (Thanks to the Saiku community we reached our Kickstart
>> <http://kickstarter.com/projects/2117053714/saiku-reporting-interactive-report-designer/>
>> goal, but you can always help by sponsoring the project
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>>
>> On 2 March 2016 at 11:22, Tom Barber <tom at analytical-labs.com> wrote:
>>
>>> Morning
>>>
>>> I need to open an extra port for each unit in my charm, can I ask juju
>>> for a count of running units in a service?
>>>
>>> Thanks
>>>
>>> Tom
>>>
>>
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