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Document the limitation of the Admission Webhook (#8072) 

In current implementation, the webhook *service* must be accessible at
port 443. The communication to the webhook may fail otherwise.
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Qiming 2018-04-30 09:39:16 +08:00 committed by k8s-ci-robot
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6
docs/admin/extensible-admission-controllers.md
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@ -129,6 +129,12 @@ apiserver sends an `admissionReview` request to webhook as specified in the
After you create the webhook configuration, the system will take a few seconds
to honor the new configuration.
**Note** When the webhook plugin is deployed into the Kubernetes cluster as a
service, it has to expose its service on the 443 port. The communication
between the API server and the webhook service may fail if a different port
is used.
{: .note}
### Authenticate apiservers
If your admission webhooks require authentication, you can configure the