Hey Tudor! thanks for doing a new charm! :D
I can show you a charm I'm doing for Drupal, take a look:
https://github.com/sebas5384/charm-drupal
Drupal needs MySQL to work, so you can do:
- Only enable ports like 80 when the db-relation-changed hook is fired, and
the relation to mysql must be required in the metadata.yaml
- You can do a bundle to ensure the topology, like openstack for example.
I'm planning to do the two :)
Cheers,
Sebas.
2014-05-21 11:53 GMT-03:00 Tudor Rogoz ro...@adobe.com:
Hi,
I'm new to juju and I just started to work on a new charm and I'm not
sure how to solve several issues.I will appreciate any advice on this.
The topology that I want to achieve is described bellow:
My service (i will call it application service) strongly depends on
the mongodb service [0].This means that the application service cannot be
installed and started without a mongo previously configured for storing the
application data.The problem is that when I'm deploying the service,
automatically the install, config-service and start hooks will be
triggered, but at this point my service cannot know about mongo service
because a relation between the 2 services is not established yet.So, it's
impossible for me to perform the product installation in the install
hook.An ugly workaround would be to perform the installation in the
relation-joined/relation-cahnged hook, but this would be my last
option.Even in this case the service unit will appear as started after
the start hook ends, but nothing will actually run there.
I would like for the charm to support the following scenario.
1/I deploy the application service
2/ the service unit remains in a pending state before the installation
hook will run because the service unit has no access to a mongo service
3/ deploy the mongo service which successfully starts
4/ add a relation between mongo and application service. The app service
will get the mongo connection information
5/ application service installation starts (the install hook is
unblocked), and successfully starts
Another problem that i have is the following:
For example, one of my application units is getting the connection
details from a specific mongodb unit while running the relation hook, were
i can store the specific information for using it in another hook? Is there
anything implemented in juju for this, or I should write the information in
a file and store it on disk and read from there when is need it?
[0] https://github.com/charms/mongodb
https://github.com/charms/mongodb
charms/mongodb · GitHub
mongodb - Mirror of juju charm, pull requests and modifications welcome!
Read more... https://github.com/charms/mongodb
Thanks a lot,
Tudor
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