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From John Smith <>
Subject Re: Extend CloudStack for a new hypervisor
Date Fri, 19 May 2017 10:57:01 GMT bear with me on this one.

"Hypervisor" was a little white lie.  What I actually want to do is
implement OpenStack as a backend for CloudStack (yo dawg, I hear you like
cloud in your clouds, etc).  I know I can use KVM and OVS as backends for
CloudStack natively but, as I said, this is for a project with some very
specific needs...

As OpenStack is completely API driven, I see no issues with the basics of
communication between CS and OS.

This would, of course, bypass the OS concept of Linux network namespaces
for routing and I would implement the CS routing VM as a VM (just like in
VMware or Xen) connected between an OS tenant network and an OS external
network.  CS volumes would be OS volumes.  Secondary storage would be a VM
running NFS.

In principle, I see that the CS concepts of compute, network and storage
could be implemented on OS.  I was hoping that I could basically write a
"driver" that would do the necessary actions against OS based on standard
calls to a CS class/method/whatever, based on some assumption that the
underlying hypervisor in CS was at least some sort of pluggable

Yes, this may sound a little crazy, and I did say this was probably not
something strategic to the CloudStack direction, but for me it actually
fits a funny shaped hole I've discovered and I'm interested in at least
understanding how such a thing could be done.



On Fri, May 19, 2017 at 12:06 AM, Simon Weller <>

> Which hypervisor are you wanting to implement​?
> Simon Weller/615-312-6068
> -----Original Message-----
> From: John Smith []
> Received: Thursday, 18 May 2017, 5:29PM
> To: []
> Subject: Extend CloudStack for a new hypervisor
> Greetings!
> I have a need to extend CloudStack to support an additional hypervisor.
> This is not something I consider strategic for CloudStack itself, but I
> have a project with a very specific need.
> I have a development background but am not an active developer right now
> ... so looking forward to getting back in the saddle!  I've never developed
> against the CloudStack tree before.
> I can't find any docs on how one would introduce support for a new
> hypervisor (eg. what classes, methods, etc, need to be implemented,
> extended, etc) and checking the source tree I can't easily see if there is
> a base to build from.  I would appreciate any pointers about where to start
> looking to save me going through the entire tree from scratch.
> The standard CloudStack concepts should be easy enough (ha!) to map 1:1 to
> this additional hypervisor (including primary & secondary storage, router &
> secondary storage VMs, the networking concepts, etc) so I'm hoping that I
> can simply implement it like a VMware or Xen backend ...
> Thanks in advance!
> John.

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