We're please to announce that the Nectar Identity service (Keystone) has now been upgraded to the Queens release. Normally an upgrade like this wouldn't require a blog post, but there's a couple of significant changes that users should be aware of. Keystone API v2.0 deprecation The Keystone v2.0 API has actually been removed from the Queens release, but we're aware that many users are still using it. We are now actively requesting that any users still using the v2.0 API to move over to the v3 API that has been available since 2016. We plan to keep the v2.0 API running until April 2019, at which time, it will no longer be available. See our Keystone v2.0 to v3 migration guide on how you can switch over. Application Credentials The long awaited application credentials are finally available in the Queens release. Application credentials allow users to generate their own OpenStack credentials suitable for applications to authenticate to the Identity service, with...

One of the problems we have in Nectar is reporting on capacity and usage of nova. We have ~1000 compute nodes and these come and go. The Openstack Placement service seems like a good place to extract capacity and usage information from nova so I thought I'd see what it could do. First problem is there is no placement client. I found the osc-placment project but this isn't that useful as it is just an openstack client plugin and not a python library like the other clients. I've written a custom client before for an internal project so I created a very simple client that can get resource provider usage and capacity. In placement a resource provider maps directly to a compute node in nova. Now we have the means to query this information I wrote a custom Ceilometer poller to collect this information periodically. Once this was collecting data I needed to configure Ceilometer and Gnocchi to ingest the notifications that my new poller was generating. In Ceilometer I ne...