My understanding is that the bulk of Walmart&#x27;s compute is run on a private openstack setup, after migrating it off of Rackspace.<p><a href="https:&#x2F;&#x2F;gigaom.com&#x2F;2015&#x2F;02&#x2F;17&#x2F;openstack-comes-up-huge-for-walmart&#x2F;" rel="nofollow">https:&#x2F;&#x2F;gigaom.com&#x2F;2015&#x2F;02&#x2F;17&#x2F;openstack-comes-up-huge-for-wa...</a>