Hello Denis, After speaking with a colleague and some further reflection on this question I am going to retract my earlier statement and offer a different best practice for this situation.
The upgrade-charm hook is best used for when the charm code changes. Such as if a new relationship was added, or there is a new interface. Essentially use upgrade-charm when the charm code changes, not the underlying application code. Instead consider adding the logic to update your web application to the config-changed hook. You could add a configuration option that is a URI to tell the charm where to get the web application code. This configuration option could contain a URI to a source control repository such as Bazaar or Github, or a directory on your computer. Users could easily change the URI when the web app is updated, and the config-changed hook can download the code and update it. Here are a few examples of how you could update the charm code using a URI: juju set mywebapp source=”lp:~mbruzek/java/webappname/trunk” juju set mywebapp source=”[email protected]:marcoceppi/amulet.git” juju set mywebapp source=”http://website.com/mywebapp/webapp.war” This option would allow the web application code to be updated when ever the source configuration option changes. I do not have a good example of this pattern at the moment. If you have any questions about this pattern please let me know. You can email me directly at [email protected] or find me on IRC mbruzek in #juju on Freenode.net On Tue, Jul 1, 2014 at 9:44 PM, Denis Weerasiri <[email protected]> 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. > > -- > Thanks, > Denis Weerasiri > > Sent from my iPhone > > -- > Juju mailing list > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/juju > >
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