Nothing to do with hyperkube. PetSets are simply ordinally ordered container collections instead of randomly ordered. The usual concept in Kubernetes is that

Nothing to do with hyperkube. PetSets are simply ordinally ordered container collections instead of randomly ordered. The usual concept in Kubernetes is that a container has a name like 'thing-randomsuffix4242'. It is pushing you towards making your pods stateless and not precious so the failure handing logic is simple. If it is blown away for whatever reason can easily be replaced by the scheduler and 'thing-randomsuffix242b' is never far away. With a predictable ordering you can actually make assumptions you otherwise couldn't. For example, perhaps you want the convention that 'thing-predictable1' is the master and 'thing-rpredictable{2,3}' are the slaves.