Break a relationship from the config-change hook

[Tim Van Steenburgh]

>
> In my config-change hook when triggered after initial install, changes
> will have effect on some of the relationships already established. The
> relationship has to be broken/invalidated and reestablished.
>
> 1) How can I check what relations are established from within the
> config-changed hook ?
>

You can use `relation-ids` and `relation-list` for this. [1]


> 2) How can I executed the “*relation-broken” hook from the "config-change"
> hook for those relationship which are established ?
>

Instead of breaking and reestablishing existing relationships, you'll want
to reconfigure them. Use `relation-set` [2] to set relation data from
within you config-changed hook. This will trigger the *relation-changed
hook on related units. Those units can get the new relation data using
`relation-get`, reconfigure themselves, and if necessary, restart their
service(s).

[1] https://juju.ubuntu.com/docs/authors-hook-environment.html#relation-list
[2] https://juju.ubuntu.com/docs/authors-hook-environment.html#relation-set
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