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Loosen DNS 952 for labels

This commit is contained in:
Tim Hockin 2014-11-20 14:27:11 +08:00
parent cc78c66a92
commit 3a3112c0e2
1 changed files with 10 additions and 2 deletions
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labels.md
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@ -18,9 +18,17 @@ Label selectors may also be used to associate policies with sets of objects.
We also [plan](https://github.com/GoogleCloudPlatform/kubernetes/issues/560) to make labels available inside pods and [lifecycle hooks](container-environment.md).
[Namespacing of label keys](https://github.com/GoogleCloudPlatform/kubernetes/issues/1491) is under discussion.
Valid label keys are comprised of two segments - prefix and name - separated
by a slash (`/`). The name segment is required and must be a DNS label: 63
characters or less, all lowercase, beginning and ending with an alphanumeric
character (`[a-z0-9]`), with dashes (`-`) and alphanumerics between. The
prefix and slash are optional. If specified, the prefix must be a DNS
subdomain (a series of DNS labels separated by dots (`.`), not longer than 253
characters in total.
Valid labels follow a slightly modified RFC952 format: 24 characters or less, all lowercase, begins with alpha, dashes (-) are allowed, and ends with alphanumeric.
If the prefix is omitted, the label key is presumed to be private to the user.
System components which use labels must specify a prefix. The `kubernetes.io`
prefix is reserved for kubernetes core components.
## Motivation