Hello, I would like to get feedback as to the best approach for performing a pre-condition check before allocating a guest vm to a physical host. For my example, a pre-condition check is to verify the guest vm does not use an existing DNS entry. If the pre-condition fails we do not want to allocate the guest vm to the physical host and we want to record this as an error condition.
As far as I can tell the only option I have is to extend the default FirstFitAllocator class and override the allocateTo methods to first perform my pre-condition verification and if it passes then to call the the overridden allocateTo() method. If it fails then I would throw a RuntimeException of some sort or possibly set the returnUpTo value equal to 0. Can you please advise as what would be the best approach? If anyone else is performing pre-conditions checks in their allocation logic before provisioning a guest VM please let me know of your approach. Thank you, Amir
