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How to monitor the VM's on Openstack running on CentOs 7 using Nagios ?

I am running Openstack on CentOs 7.

I have configured the system with one controller node and two compute nodes. Now i wish to monitor the Vm's running on the compute nodes through the controller node using the Nagios tool.

Should i install/use Nagios only on the controller node or on the compute nodes as well to get the desired result ?