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Clayton Coleman 3ba8af04ac Clarify name must be lowercase in docs, to match code 
We restrict DNS_SUBDOMAIN to lowercase for sanity.
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Identifiers

All objects in the Kubernetes REST API are identified by a Name and a UID.

Names

Names are user-provided. Only one object of a given kind can have a given name at a time. But if you delete an object, you can make a new object with the same name. Names are the used to refer to an object in a resource URL, such as /api/v1beta3/pods/some.name. Names may be up to maximum length of 253 characters and consist of lower case alphanumeric characters, -, and .. See the identifiers design doc for the precise syntax rules for names.

UIDs

UID are generated by Kubernetes. Every object created over the whole lifetime of a Kubernetes cluster has a distinct UID.