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Adding compute node to existing packstack installation

I have a network like this : external net eth0 --- **Controller Node**
                                       | eth1
                                     **switch** ---  eth1 **Intended Compute Node**

I already have an existing installation using packstack that works and can launch instances. It itself it acting as a compute resource.

I saw the instructions here to add additional compute nodes :

Are these instructions intended to be run on the Controller Node? Or the Compute Node? It looks like they are for the Controller Node, but I find it hard to believe that the compute node can join the controller node automatically just like this.

What do I have to do on the Compute Node? Do I have to do the openstack installation?

Please bear with me, I am totally new to OpenStack..