[Openstack-operators] Sharing resources across OpenStack instances

Fox, Kevin M Kevin.Fox at pnnl.gov
Wed Apr 22 13:50:47 UTC 2015

This is a case for a cross project cloud (institutional?). It costs more to run two little clouds then one bigger one. Both in terms of man power, and in cases like these. under utilized resources.

#3 is interesting though. If there is to be an openstack app catalog, it would be inportant to be able to pull the needed images from outside the cloud easily.


From: Adam Young
Sent: Wednesday, April 22, 2015 6:32:17 AM
To: openstack-operators at lists.openstack.org
Subject: [Openstack-operators] Sharing resources across OpenStack instances

Its been my understanding that many people are deploying small OpenStack
instances as a way to share the Hardware owned by their particular team,
group, or department.  The Keystone instance represents ownership, and
the identity of the users comes from a corporate LDAP server.

Is there much demand for the following scenarios?

1.  A project team crosses organizational boundaries and has to work
with VMs in two separate OpenStack instances.  They need to set up a
network that requires talking to two neutron instances.

2.  One group manages a powerful storage array.  Several OpenStack
instances need to be able to mount volumes from this array. Sometimes,
those volumes have to be transferred from VMs running in one instance to

3.  A group is producing nightly builds.  Part of this is an image
building system that posts to glance.  Ideally, multiple OpenStack
instances would be able to pull their images from the same glance.

4. Hadoop ( or some other orchestrated task) requires more resources
than are in any single OpenStack instance, and needs to allocate
resources across two or more instances for a single job.

I suspect that these kinds of architectures are becoming more common.
Can some of the operators validate these assumptions?  Are there other,
more common cases where Operations need to span multiple clouds which
would require integration of one Nova server with multiple Cinder,
Glance, or Neutron  servers managed in other OpenStack instances?

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