Generating Node Certificates for X-Pack

I am installing X-Pack on a 3 node cluster and am now at the step to generate the node certificates based on the X-Pack installation documentation.

Is it necessary to create a certificate authority (CA) on every node of the cluster or just on the first node?

There is also a step where the .p12 certificate should be copied into a /config/certs folder. Does this .p12 certificate need to be generated on each node or can I simply copy the certificate file generated on the first node into the other nodes in the cluster?

As long as the certificate contains the domain/ip of each node in the cluster, you can reuse it for all the nodes in that Cluster. And there is no need to create a CA for each then.

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