[Juju] Multiple sub service with a relation

[Samuel Cozannet]

Hi Ana,

If you have multiple servers, you'll have multiple relations.

The administrator running the environment will have a knowledge of all the
relations, thus of the servers and names.

Your charm shall be able to match relation counterparts and config options
and log the potential errors without exiting, so that in case of mistake
the admin can observe what's wrong and fix it.

Now I guess what John was saying would be that the settings in the config
would be a json string such as
juju set charmname datasources=[
  { "name": "mysql",
    "server": "server.domain",
    "datasets": [ "ds1", "ds2", ... ],
  },
  { "name": "mongodb",
    "server": "mongo.domain",
    "datasets": [ "ds3", "ds4", ... ],
  },
  ...
  ]

Or another format... But basically putting the unknown in something that
you manipulate as an object in your code.

Hope it's clearer.
++
Samuel

Best,
Samuel

--
Samuel Cozannet
Cloud, Big Data and IoT Strategy Team
Business Development - Cloud and ISV Ecosystem
Changing the Future of Cloud
Ubuntu <http://ubuntu.com>  / Canonical UK LTD <http://canonical.com> / Juju
<https://jujucharms.com>
samuel.cozannet at canonical.com
mob: +33 616 702 389
skype: samnco
Twitter: @SaMnCo_23
[image: View Samuel Cozannet's profile on LinkedIn]
<https://es.linkedin.com/in/scozannet>

On Thu, Aug 20, 2015 at 1:54 PM, Ana Tomic <Ana.Tomic at mht.net> wrote:

> Hi everyone,
>
>
>
> Thank you for your suggestion.
> If I have understood well, if we use config options the user should be
> able to use something like:
>
> juju set <charmname> database-server=<server_name>
>
> We want to connect to various numbers of servers at the same time, so we
> need an option for every server.
>
> Like database_server1, database_server2... but the problem is that we can
> not specify the exact number of servers.
> Is there a way to have variate number of options?
>
>
>
> Thanks in advance,
>
> Ana
>
>
>
> *From:* Samuel Cozannet [mailto:samuel.cozannet at canonical.com]
> *Sent:* Thursday, August 20, 2015 11:06 AM
> *To:* John Meinel
> *Cc:* Amir Sanjar; Ana Tomic; Juju email list; Alberto Ghedin
> *Subject:* Re: [Juju] Multiple sub service with a relation
>
>
>
> Thanks John!
>
> Allow me to rephrase as I am not sure I am following. Are saying we could
> have a declarative format in the configuration of the charm that would
> apply to relations created like:
>
> "datasources" : [
>
>   { "name": "mysql",
>
>     "datasets": [ "ds1", "ds2", ... ],
>   },
>
>   { "name": "mongodb",
>
>     "datasets": [ "ds3", "ds4", ... ],
>   },
>
>   ...
>   ]
>
>
>
> and then config-changed hook would replay the creation of relations for
> any new datasets?
>
> @Alberto, Ana: if my understanding is correct, this would be a way to
> expose the configuration of the datasets / schemas from the charm config.
> Some code to generate to manage errors (absence of dataset, absence of
> relation to datasource, wrong datasource definition...) but it seems closer
> to Juju's philosophy than using actions.
>
> ++
>
> Sam
>
>
>
> On Thu, Aug 20, 2015 at 1:30 AM, John Meinel <john at arbash-meinel.com>
> wrote:
>
> Would this just be config on the charm that would eventually become config
> on the relation?
>
>
>
>
> Best,
>
> Samuel
>
>
>
> --
>
> Samuel Cozannet
>
> Cloud, Big Data and IoT Strategy Team
>
> Business Development - Cloud and ISV Ecosystem
>
> Changing the Future of Cloud
> Ubuntu <http://ubuntu.com>  / Canonical UK LTD <http://canonical.com> /
> Juju <https://jujucharms.com>
>
> samuel.cozannet at canonical.com
>
> mob: +33 616 702 389
>
> skype: samnco
>
> Twitter: @SaMnCo_23
> [image: Image removed by sender. View Samuel Cozannet's profile on
> LinkedIn] <https://es.linkedin.com/in/scozannet>
>
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