If these machines are stateless, does each new instance need a new and unique identity in
IPA?
I don't know if multiple instances concurrently sharing a common identity for IPA
purposes would work, but maybe have a pool of identities, and have each newly instantiated
machine draw an identity from the pool?
FWIW, we have a number of machines that have a different hostname in IPA to the hostname
they use on the network, and touch wood, so far it works fine.