I will be configuring a HDP cluster with a standalone KDC. I see info on how to setup multiple KDCs
for the HDP components. How should I set up the multiple KDCs? Can I create a master KDC with an
HA pair? Has anyone deployed something like this in the real world?
You can deploy Master Slave KDC. That will provide HA. I have done this before. You can setup replication between master and slave.
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Another source for master/slave configuration is https://web.mit.edu/kerberos/krb5-1.12/doc/admin/install_kdc.html