Juju Charm - Manila fileshare generic backend plugin
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  • Add roles to the manila charm: api, scheduler, data, process, (all)
  • Add a manila-backend-plugin interface
  • Split the generic configuration into manila-generic-backend charm
  • Add unit tests
  • Put the manual testing bits into charm-openstack-testing so that the bundles are available

Add roles:

It's necessary for the manila charm to be able to install itself as one of a number of roles:

  1. The manila-api: this provides the API to the rest of OpenStack. Until this is HA aware, only ONE manila-api can be provisioned. Also, it may not make sense to provision more than one manila-api server per OpenStack installation.
  2. The manila-scheduler: TODO
  3. The manila-data process: TODO
  4. The manila-share process: TODO

Split the generic backend configuration out into a separate charm + interface

It's necessary to have the ability to configure a share backend independently of the main charm. This means that plugin charms will be used to configure each backend.

Essentially, a plugin needs to be able to configure:

  • it's section in the manila.conf along with any network plugin's that it needs (assuming that it's a share that manages it's own share-instance).
  • ensure that the relevant bits are restarted.

It's not clear whether, for example, the api bit needs to know if the backend is a generic backend, rather than something else.

Anyway, to start with:

  • charm-manila : the main charm that can be deployed as multiple roles
  • interface-manila-backend-plugin : the interface for plugging in the generic backend (and other interfaces)
  • charm-manila-generic-backend : the plugin for configuring the generic backend.

The backend needs to provide a piece of the manila.conf configuration file with the bits necessary to configure the backend. This is mostly for the share, rather than the api level. However, the issue is that parts of this file actually need informatation from the principal charm (i.e. the manila service user and password). And only the API charm should register with keystone (particularly when the HA stuff is done with a floating VIP).

So, to solve that particular problem, we need to 'half' do the template, OR provide the keystone 'manila' user credentials across the interface. And I prefer the latter!