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upper case restriction doesn't exist (#7003) 

During my test, the restriction of "form of DNS labels" doesn't exist, we can create labels with upper-case letters.
reviewable/pr7096/r1
Drinky Pool 2018-01-26 08:37:36 +08:00 committed by k8s-ci-robot
parent 282455f269
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docs/concepts/configuration/assign-pod-node.md
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@ -40,8 +40,6 @@ Run `kubectl get nodes` to get the names of your cluster's nodes. Pick out the o
If this fails with an "invalid command" error, you're likely using an older version of kubectl that doesn't have the `label` command. In that case, see the [previous version](https://github.com/kubernetes/kubernetes/blob/a053dbc313572ed60d89dae9821ecab8bfd676dc/examples/node-selection/README.md) of this guide for instructions on how to manually set labels on a node. If this fails with an "invalid command" error, you're likely using an older version of kubectl that doesn't have the `label` command. In that case, see the [previous version](https://github.com/kubernetes/kubernetes/blob/a053dbc313572ed60d89dae9821ecab8bfd676dc/examples/node-selection/README.md) of this guide for instructions on how to manually set labels on a node.
Also, note that label keys must be in the form of DNS labels (as described in the [identifiers doc](https://git.k8s.io/community/contributors/design-proposals/architecture/identifiers.md)), meaning that they are not allowed to contain any upper-case letters.
You can verify that it worked by re-running `kubectl get nodes --show-labels` and checking that the node now has a label. You can verify that it worked by re-running `kubectl get nodes --show-labels` and checking that the node now has a label.
### Step Two: Add a nodeSelector field to your pod configuration ### Step Two: Add a nodeSelector field to your pod configuration