28 lines
1.6 KiB
Markdown
28 lines
1.6 KiB
Markdown
<!-- BEGIN MUNGE: UNVERSIONED_WARNING -->
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<!-- BEGIN STRIP_FOR_RELEASE -->
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<h1>*** PLEASE NOTE: This document applies to the HEAD of the source
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tree only. If you are using a released version of Kubernetes, you almost
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certainly want the docs that go with that version.</h1>
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<strong>Documentation for specific releases can be found at
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[releases.k8s.io](http://releases.k8s.io).</strong>
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<!-- END STRIP_FOR_RELEASE -->
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<!-- END MUNGE: UNVERSIONED_WARNING -->
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# Identifiers
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All objects in the Kubernetes REST API are unambiguously identified by a Name and a UID.
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For non-unique user-provided attributes, Kubernetes provides [labels](labels.md) and [annotations](annotations.md).
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## Names
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Names are generally client-provided. Only one object of a given kind can have a given name at a time (i.e., they are spatially unique). 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/v1/pods/some-name`. By convention, the names of Kubernetes resources should be up to maximum length of 253 characters and consist of lower case alphanumeric characters, `-`, and `.`, but certain resources have more specific restrictions. See the [identifiers design doc](design/identifiers.md) for the precise syntax rules for names.
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## UIDs
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UID are generated by Kubernetes. Every object created over the whole lifetime of a Kubernetes cluster has a distinct UID (i.e., they are spatially and temporally unique).
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[]()
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