On Thu, May 25, 2017 at 12:59 PM, Giuseppe Attardi <giuseppe.atta...@garr.it > wrote:
> I have written a charm for OpenStack Gnocchi. > The service requires a postgresql database relation. > > The start hook fails, of course, because the relation is not set. > > I expected that, but I expected that when I issue > > juju add-relation gnocchi postgresql:db > > it will invoke the database-relation-joined hook, which does set the > required parameter and then start would work. > However the hook is not invoked: as a sanity check I set a juju-log > message in it and it does not run at all. > > Is it correct to assume that add-relation will always trigger > database-relation-join? > Yes it will. Assuming your relation is named 'database', then the database-relation-joined will be triggered when that relation is established. For more help debugging you may need to post a link to your code. > A second question, I would like to avoid to start the service until the > relation has been joined. > What is the best way to test for the relation to be present? > You should start the service in the database-relation-changed hook handler, once you have received all necessary relation data. > > I tried with > > db=`relation-get -r database host` > > but it fails with: > > INFO start error: invalid value "database" for flag -r: invalid > relation id > > I am using juju-2.1.2 > > Thanks for the help. > > — Beppe Attardi > -- > Juju mailing list > Juju@lists.ubuntu.com > Modify settings or unsubscribe at: https://lists.ubuntu.com/ > mailman/listinfo/juju >
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