[keystone][nova] Availability zones and unified limits

Lance Bragstad lbragstad at gmail.com
Tue Nov 20 12:33:50 UTC 2018

Unified limits cropped up in a few discussions last week. After describing
the current implementation of limits, namely the attributes that make up a
limit, someone asked if availability zones were on the roadmap.

Ideally, it sounded like they had multiple AZs in a single region, and they
wanted to be able to limit usage within the AZ. With the current
implementation, regions would be the smallest unit of a deployment they
could limit (e.g., limit project Foo to only using 64 compute cores within
RegionOne). Instead, the idea would be to limit the number of resources for
that project on an AZ within a region.

What do people think about adding availability zones to limits? Should it
be an official attribute in keystone? What other services would need this
outside of nova?

There were a few other interesting cases that popped up, but I figured we
could start here. I can start another thread if needed and we can keep this
specific to discussing limits + AZs.

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