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Previous verbiage gave the impression that a separate "signing" server can be used to prevent the copying of private keys (ie. master.pem) across the network. The problem is that the process to generate a signature file requires both the master.pem (from the original master) and the master_sign.pem (from the signing master) to be on the same box. This would require either copying the appropriate pem file from one master to another. Unfortunately, there is no current way around copying the pem files if you are trying to implement a separate master signing server.
This process turns an existing master into a signing server to reduce overhead of auth-requests coming from minions attached to it.
What does this PR do?
Corrects the inference that a separate signing master server prevents the copying of private keys across the network.