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add doc for ServiceNodePortStaticSubrange #39850

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Mar 22, 2023
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add doc for ServiceNodePortStaticSubrange #39850

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14 changes: 14 additions & 0 deletions content/en/docs/concepts/services-networking/service.md
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Expand Up @@ -586,6 +586,20 @@ spec:
nodePort: 30007
```

#### Reserve Nodeport Ranges to avoid collisions when port assigning

{{< feature-state for_k8s_version="v1.27" state="alpha" >}}

The policy for assigning ports to NodePort services applies to both the auto-assignment and
the manual assignment scenarios. When a user wants to create a NodePort service that
uses a specific port, the target port may conflict with another port that has already been assigned.
In this case, you can enable the feature gate `ServiceNodePortStaticSubrange`, which allows you
to use a different port allocation strategy for NodePort Services. The port range for NodePort services
is divided into two bands. Dynamic port assignment uses the upper band by default, and it may use
the lower band once the upper band has been exhausted. Users can then allocate from the lower band
with a lower risk of port collision.


#### Custom IP address configuration for `type: NodePort` Services {#service-nodeport-custom-listen-address}

You can set up nodes in your cluster to use a particular IP address for serving node port
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1 change: 1 addition & 0 deletions content/en/docs/reference/command-line-tools-reference/feature-gates.md
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Expand Up @@ -186,6 +186,7 @@ For a reference to old feature gates that are removed, please refer to
| `SeccompDefault` | `true` | Beta | 1.25 | |
| `ServerSideFieldValidation` | `false` | Alpha | 1.23 | 1.24 |
| `ServerSideFieldValidation` | `true` | Beta | 1.25 | |
| `ServiceNodePortStaticSubrange` | `false` | Alpha | 1.27 | |
| `SizeMemoryBackedVolumes` | `false` | Alpha | 1.20 | 1.21 |
| `SizeMemoryBackedVolumes` | `true` | Beta | 1.22 | |
| `StatefulSetAutoDeletePVC` | `false` | Alpha | 1.22 | |
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