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ExternalName cleanup (#11326) 

* Remove old kube-dns note

* ExternalName IP clarification

* Add minor edits for clarity

* corrections

Co-Authored-By: nikopen <42466421+nikopen@users.noreply.github.com>
This commit is contained in:
Niko Pen 2018-12-17 11:03:04 -08:00 committed by Kubernetes Prow Robot
parent 3ccbb12585
commit 8f6f6731c5
1 changed files with 7 additions and 6 deletions
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13
content/en/docs/concepts/services-networking/service.md
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@ -758,13 +758,10 @@ for supported instance types.
### Type ExternalName {#externalname} ### Type ExternalName {#externalname}
{{< note >}} Services of type ExternalName map a service to a DNS name, not to a typical selector such as
ExternalName Services are available only with `kube-dns` version 1.7 and later. `my-service` or `cassandra`. You specify these services with the `spec.externalName` parameter.
{{< /note >}}
Services of type ExternalName map a service to a DNS name (specified using This Service definition, for example, maps
the `spec.externalName` parameter) rather than to a typical selector like
`my-service` or `cassandra`. This Service definition, for example, would map
the `my-service` Service in the `prod` namespace to `my.database.example.com`: the `my-service` Service in the `prod` namespace to `my.database.example.com`:
```yaml ```yaml
@ -777,6 +774,10 @@ spec:
type: ExternalName type: ExternalName
externalName: my.database.example.com externalName: my.database.example.com
``` ```
{{< note >}}
ExternalName accepts an IPv4 address string, but as a DNS name comprised of digits, not as an IP address. ExternalNames that resemble IPv4 addresses are not resolved by CoreDNS or ingress-nginx because ExternalName
is intended to specify a canonical DNS name. To hardcode an IP address, consider headless services.
{{< /note >}}
When looking up the host `my-service.prod.svc.cluster.local`, the cluster DNS service When looking up the host `my-service.prod.svc.cluster.local`, the cluster DNS service
will return a `CNAME` record with the value `my.database.example.com`. Accessing will return a `CNAME` record with the value `my.database.example.com`. Accessing