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Understanding OpenStack

I need to understand more complexity of OpenStack stuff. Suppose I want to have a Cloud supporting Tomcat 7, PostGreSQL and File Servers (NFS+Samba). Usually I would create 3 Virtual Machine (Let say KVM under ubuntu), do virtual network and route traffic to outside word. Now external users can happily use, for example file server, to save/retrieve their files. I would use KVM tools with SSH to manage the hypervisor instances.

Now the documents I read and video I see in youtube about openstack seems to give me impression that openstack Simplifies this process (with Juju). Is this correct? If yes how does it achieve it? If no any resource for beginner (I find their beginners guide hard to understand)

Sorry If I missed something, am new here!