Openstack architecture diagram (kvm, qemu-kvm, libvirt, nova, cinder)a

Correct me if i am wrong.

Openstack components (nova, cinder, glance) controls libvirt to provide visualization and libvirt use qemu-kvm as the hypervisor. The reason openstack don’t control the qemu-kvm directly is because libvirt provides better cross VM functionality (it can adopt to xen, vmware, etc…) and it provides high-end function such pool management and column management.

KVM is the hypervisor, is emulate the CPU but it don’t do anything about networking and I/O peripheral control. That’s why we need to use qemu-kvm as the emulator to emulator all the peripherals, rather than use KVM directly.

The following diagram is the relationship between kvm, qemu-kvm, libvirt and openstack components.

openstack architecture diagram

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