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add a note re selectorless services and proxy

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Khaled (Kal) Henidak
2021-09-20 18:00:47 +00:00
parent 30c47c9ce1
commit 2cf2b1937e
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content/en/docs/concepts/services-networking/service.md
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@@ -183,6 +183,13 @@ Accessing a Service without a selector works the same as if it had a selector.
In the example above, traffic is routed to the single endpoint defined in In the example above, traffic is routed to the single endpoint defined in
the YAML: `192.0.2.42:9376` (TCP). the YAML: `192.0.2.42:9376` (TCP).
{{< note >}}
The Kubernetes API server does not allow proxying to endpoints that are not mapped to
pods. Actions such as `kubectl proxy <service-name>` where the service has no
selector will fail due to this constraint. This prevents the Kubernetes API server
from being used as a proxy to endpoints the caller may not be authorized to access.
{{< /note >}}
An ExternalName Service is a special case of Service that does not have An ExternalName Service is a special case of Service that does not have
selectors and uses DNS names instead. For more information, see the selectors and uses DNS names instead. For more information, see the
[ExternalName](#externalname) section later in this document. [ExternalName](#externalname) section later in this document.