Open Stack

Folks,

This is a very broad question and could have many answers but still wanted
to ask to see what people are thinking and doing.

We have DC with multiple racks and around 600 nodes so we are planning to
create 3 private openstack and each with 200 nodes. In other data centers
we have multiple 200 nodes openstack clusters and life is good. In the new
datacenter I am thinking of deploying the same way openstack but shared
keystone between multiple openstack environments to have a single place for
identification and I am going to call it 3 regions even it's in a single
DC. Hope shared keystone is helpful/easier for doing terrafrom work and
selecting region easily.

Other option I was thinking about to deploy cellv2 technology and put all
600 nodes in single cloud but always worried for operation point of view.
Now sure how many people running cellv2 successfully without pain. (Except
CERN)

If people running multi-region openstack cloud then please share some
thought and idea to make life easier. Not looking for best solution but
just clue to get idea to deploy and manage multiple openstack.

Thanks in advance.
S
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