Re: Is there a universal interface I can use?

[Stuart Bishop]

On 28 November 2017 at 20:22, Tilman Baumann
 wrote:

> That would be quite nice actually. Backup and snapshot could be two
> different actions even.
> Snapshot is a little low-level as it is per-node. But it makes for fast
> recovery if a node hickups.
> Full backup like Haw Leoeung implemented in
> https://jujucharms.com/u/hloeung/cassandra-backup/ is probably even more
> useful for many scenarios.

There doesn't seem to be a standard backup mechanism, so backup
probably belongs in a subordinate. I currently have a subordinate that
rsyncs the files to a backup host on my smallest deployment (per
https://insights.ubuntu.com/2015/08/04/introducing-turku-cloud-friendly-backups-for-your-infrastructure/)


> I'm quite stumped right now with the odd combination of needing to be a
> subordinate and needing to connect to the database relation.
> I just can't get it to work. And I'm out of ideas.
> I would love to just finish it "to get it to work" but I don't know what
> else I could try at this point.

You just need to define the juju-info container scoped relation as
well as the standard cassandra relation.

subordinate: true
requires:
  cassandra:
interface: cassandra
  juju-info:
interface: juju-info
scope: container

When you deploy, you need to connect both relations and you will have
them both become available, with the different scopes:

juju add-relation mysub:juju-info cassandra:juju-info
juju add-relation mysub:cassandra cassandra:database


> I'm not very familiar with the coding style used in the cassandra charm.
> But I think I could help you with adding those functionalities even.
> I will have a lot of distractions the next two weeks. But I can see what
> I can do...

I want to make time to rework it as a charms.reactive charm. But
adding an action shouldn't need that, as the actions.yaml and
actions/foo script don't need any dependencies on the rest of the
charm.


-- 
Stuart Bishop 

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[charms] 17.11 OpenStack Charms release

[David Ames]

Announcing the 17.11 release of the OpenStack Charms.

In addition to 125 bug fixes across the charms, the release includes
official support for Gnocchi and support for QoS. Several charms have
made the migration to python3 only run-time.

For full details of the release, please refer to the release notes:

  https://docs.openstack.org/charm-guide/latest/1711.html

Thanks go to the following contributors for this release:

 Alex Kavanagh
 Andrew McLeod
 Aydin Doyak
 Billy Olsen
 Chris MacNaughton
 Corey Bryant
 David Ames
 Dmitrii Shcherbakov
 Edward Hope-Morley
 Evgeny Kremenetsky
 Felipe Reyes
 Frode Nordahl
 Fulvio Galeazzi
 Haw Loeung
 Hua Zhang
 James Page
 Jorge Niedbalski
 Liam Young
 Marian Gasparovic
 Michael Skalka
 Nobuto Murata
 Pete Vander Giessen
 Ryan Beisner
 Seyeong Kim
 Shane Peters
 Tytus Kurek
 Xav Paice
 viswesuwara nathan
 zhangyangyang

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