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Merge pull request #27634 from kinvolk/mauricio/fix-label-value-requirements 

Fix requirements for label value
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Kubernetes Prow Robot 2021-04-22 07:37:42 -07:00 committed by GitHub
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content/en/docs/concepts/overview/working-with-objects/labels.md
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@ -53,8 +53,8 @@ If the prefix is omitted, the label Key is presumed to be private to the user. A
The `kubernetes.io/` and `k8s.io/` prefixes are reserved for Kubernetes core components.
Valid label value:
* must be 63 characters or less (cannot be empty),
* must begin and end with an alphanumeric character (`[a-z0-9A-Z]`),
* must be 63 characters or less (can be empty),
* unless empty, must begin and end with an alphanumeric character (`[a-z0-9A-Z]`),
* could contain dashes (`-`), underscores (`_`), dots (`.`), and alphanumerics between.
For example, here's the configuration file for a Pod that has two labels `environment: production` and `app: nginx` :
@ -237,4 +237,3 @@ selector:
One use case for selecting over labels is to constrain the set of nodes onto which a pod can schedule.
See the documentation on [node selection](/docs/concepts/scheduling-eviction/assign-pod-node/) for more information.