Open Stack

I would like to deploy OpenStack with two compute nodes; one using
KVM(which seems to be default) and one using VMware ESXi. I am clear on how
to use KVM compute nodes but its not clear on how to deploy the compute for
ESXi.

Assumptions
I cant install compute software on the ESXi server directly since ESXi runs
a proprietary baremetal OS.
I dont need any other proprietary software/license other than ESXi. That is
I dont need vSphere or vCenter etc.

These are some of the questions that I have:
Do I need another physical server to install compute which then points to
the ESXi?
Or Do I need to create a Ubuntu(lets say) VM with in ESXi host and install
compute inside this Ubuntu VM?

Any help in clarifying these will be greatly appreciated. Also if there is
a pointer to a deployment diagram for such a case, that will be great as
well.

Regards,
Balu
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