Juju is a Package Manager, service orchestration management tool developed by Canonical for development of Cloud Computing of your own. Juju was formerly known as Ensemble.

Ken Pepple - OpenStack Folsom Architecture

OpenStack cloud computing : architecture guide / John Rhoton with contributions from Jan de Clercq, Franz Novak

OpenStack has adopted a three-node design whereby a controller, compute, and network node make up its architecture #OpenStack

A thing of beauty - logical architecture of OpenStack

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