There are two nodes in this cluster as normal, and this time I use the temporary license key for this installation. So the key for two nodes are the same. And the runtime is in the shared directory, so the cft-tcp.conf and cft.key is working fine.

But if next time I apply permanent key for customer, the key for two nodes must be different.I think I can not use one cft-tcp.conf and cft.key in one shared directory to start CFT in both two nodes.

When I complete the installation in first node and second node, I do not see any configuration for multi key, so how we handle this situation?

For CFT you need to provide three keys (Node1 key, Node2 key and Cluster key) in the cft.key file.