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://avatars1.githubusercontent.com/u/1050808?s=400]<https://github.com/charms/mongodb> charms/mongodb ยท 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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