Best practice to continuously integrate application updates

[Andrew Wilkins]

On Wed, Jul 2, 2014 at 10:47 AM, Denis Weerasiri <ddweerasiri at gmail.com>
wrote:

> Hi,
> I mentioned the command as "charm-update". But it should have been
> "upgrade-charm"
> https://juju.ubuntu.com/docs/authors-charm-upgrades.html
>
>
> On Wed, Jul 2, 2014 at 12:44 PM, Denis Weerasiri <ddweerasiri at gmail.com>
> wrote:
>
>> Hi,
>> Support I have written a charm to deploy a web application on top of
>> tomcat. And now I need to redeploy the web application when I update the
>> source repository of the web application. What is the best practice to do
>> this?
>> What I have in mind is to write a new version of charm and use
>> charm-update command. So juju will re-deploy the web application.
>>
>
A charmer will be able to give you better directions, but what existing
charms do is have a source revision (and maybe repository) charm config
setting.
You would then do "juju set myapp revision=<rev>", which would trigger a
config-changed hook call in your charm. The charm is then responsible for
pulling down the new revision and restarting the application.

HTH,
Andrew
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