Merge pull request #32003 from kerthcet/feature/graduate-defaultPodTopologySpread-to-ga
feat: feature gate DefaultPodTopologySpread is GA
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@@ -4,21 +4,11 @@ content_type: concept
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weight: 40
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weight: 40
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---
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---
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{{< feature-state for_k8s_version="v1.19" state="stable" >}}
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<!-- leave this shortcode in place until the note about EvenPodsSpread is
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obsolete -->
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<!-- overview -->
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<!-- overview -->
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You can use _topology spread constraints_ to control how {{< glossary_tooltip text="Pods" term_id="Pod" >}} are spread across your cluster among failure-domains such as regions, zones, nodes, and other user-defined topology domains. This can help to achieve high availability as well as efficient resource utilization.
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You can use _topology spread constraints_ to control how {{< glossary_tooltip text="Pods" term_id="Pod" >}} are spread across your cluster among failure-domains such as regions, zones, nodes, and other user-defined topology domains. This can help to achieve high availability as well as efficient resource utilization.
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{{< note >}}
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In versions of Kubernetes before v1.18, you must enable the `EvenPodsSpread`
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[feature gate](/docs/reference/command-line-tools-reference/feature-gates/) on
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the [API server](/docs/concepts/overview/components/#kube-apiserver) and the
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[scheduler](/docs/reference/command-line-tools-reference/kube-scheduler/) in order to use Pod
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topology spread constraints.
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{{< /note >}}
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<!-- body -->
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<!-- body -->
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@@ -321,21 +311,17 @@ profiles:
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```
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```
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{{< note >}}
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{{< note >}}
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The score produced by default scheduling constraints might conflict with the
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[`SelectorSpread` plugin](/docs/reference/scheduling/config/#scheduling-plugins)
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score produced by the
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is disabled by default. It's recommended to use `PodTopologySpread` to achieve similar
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[`SelectorSpread` plugin](/docs/reference/scheduling/config/#scheduling-plugins).
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behavior.
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It is recommended that you disable this plugin in the scheduling profile when
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using default constraints for `PodTopologySpread`.
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{{< /note >}}
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{{< /note >}}
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#### Internal default constraints
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#### Built-in default constraints {#internal-default-constraints}
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{{< feature-state for_k8s_version="v1.20" state="beta" >}}
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{{< feature-state for_k8s_version="v1.24" state="stable" >}}
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With the `DefaultPodTopologySpread` feature gate, enabled by default, the
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If you don't configure any cluster-level default constraints for pod topology spreading,
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legacy `SelectorSpread` plugin is disabled.
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then kube-scheduler acts as if you specified the following default topology constraints:
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kube-scheduler uses the following default topology constraints for the
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`PodTopologySpread` plugin configuration:
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```yaml
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```yaml
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defaultConstraints:
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defaultConstraints:
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@@ -348,7 +334,7 @@ defaultConstraints:
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```
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```
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Also, the legacy `SelectorSpread` plugin, which provides an equivalent behavior,
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Also, the legacy `SelectorSpread` plugin, which provides an equivalent behavior,
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is disabled.
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is disabled by default.
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{{< note >}}
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{{< note >}}
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The `PodTopologySpread` plugin does not score the nodes that don't have
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The `PodTopologySpread` plugin does not score the nodes that don't have
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