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additional controller node(s)

Hi Openstack experts,

I have some questions with regards to adding additional controller nodes:

(1) when you install and configure an additional controller node (with a different ip address of course) in the openstack environment, does the additional controller node automatically get connected to the same openstack environment and be able to talk to the old controller nodes which already existed in the openstack environment?

(2) if you have 3 controller nodes in the same openstack environment, do these 3 controller nodes take on different roles or do they basically perform the same tasks? do the load automatically get distributed among the 3 controller nodes? If one of the controller nodes go down, does that mean the other 2 nodes will take on what that one was doing so no operation would be disrupted?