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[KEP-2400] Update swap with beta2 deprecations #45128

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Mar 12, 2024
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[KEP-2400] Update swap with beta2 deprecations #45128

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ae7fbbe
add swap website update
kannon92 Feb 13, 2024
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kannon92 Mar 11, 2024
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12 changes: 6 additions & 6 deletions content/en/docs/concepts/architecture/nodes.md
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Expand Up @@ -518,9 +518,10 @@ During a non-graceful shutdown, Pods are terminated in the two phases:
{{< feature-state state="beta" for_k8s_version="v1.28" >}}

To enable swap on a node, the `NodeSwap` feature gate must be enabled on
the kubelet, and the `--fail-swap-on` command line flag or `failSwapOn`
the kubelet (default is true), and the `--fail-swap-on` command line flag or `failSwapOn`
[configuration setting](/docs/reference/config-api/kubelet-config.v1beta1/)
must be set to false.
must be set to false.
To allow Pods to utilize swap, `swapBehavior` should not be set to `NoSwap` (which is the default behavior) in the kubelet config.

{{< warning >}}
When the memory swap feature is turned on, Kubernetes data such as the content
Expand All @@ -532,17 +533,16 @@ specify how a node will use swap memory. For example,

```yaml
memorySwap:
swapBehavior: UnlimitedSwap
swapBehavior: LimitedSwap
```

- `UnlimitedSwap` (default): Kubernetes workloads can use as much swap memory as they
request, up to the system limit.
- `NoSwap` (default): Kubernetes workloads will not use swap.
- `LimitedSwap`: The utilization of swap memory by Kubernetes workloads is subject to limitations.
Only Pods of Burstable QoS are permitted to employ swap.

If configuration for `memorySwap` is not specified and the feature gate is
enabled, by default the kubelet will apply the same behaviour as the
`UnlimitedSwap` setting.
`NoSwap` setting.

With `LimitedSwap`, Pods that do not fall under the Burstable QoS classification (i.e.
`BestEffort`/`Guaranteed` Qos Pods) are prohibited from utilizing swap memory.
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