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Understand host vs cell (API)

asked 2015-07-30 11:40:27 -0500

mmaurizi gravatar image

Hi all.

I'm starting to work on cell but after reading documentation i still have a couple of question.

  1. Is there a way to know what are the hosts contained in a cell using API?
  2. Are cell contained in a region or is a concept cross different region;
  3. Is cell hierarchy 2 level or more?
  4. Can cell be sub partitioned in host aggregate and in case an host aggregate have to be fully contained in cell?
  5. Similar question for availability zone

If anyone have material to share about cell (also v2) it will be more then helpful!

Thanks.

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answered 2015-08-04 03:50:29 -0500

kumar lakshman kumar gravatar image

1 Is there a way to know what are the hosts contained in a cell using API? currently i dont think, but in v2 there is a new DB nova_api which have host mapping to cell table

2 Are cell contained in a region or is a concept cross different region; In Region you have all openstack components in one region and common Horizon and/or keystone Cell is for scaling the NOVA, for each cell have its own DB and AMQP and API only at API cell

3 Is cell hierarchy 2 level or more? i think it can be more than 2, http://www.dorm.org/blog/exploring-op...

4 Can cell be sub partitioned in host aggregate and in case an host aggregate have to be fully contained in cell? it is not supported officially, but yeah there are few deployments where cells have Availability zones and host aggregates

https://blueprints.launchpad.net/nova...

If anyone have material to share about cell (also v2) it will be more then helpful!

i think good to look at the blue prints, lot of changes going into v2

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Asked: 2015-07-30 11:40:27 -0500

Seen: 300 times

Last updated: Aug 04 '15