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Separate priority and preemption #8144

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Apr 26, 2018
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Separate priority and preemption #8144

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21 changes: 21 additions & 0 deletions docs/concepts/configuration/pod-priority-preemption.md
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Expand Up @@ -57,6 +57,27 @@ scheduler. After the feature is disabled, the existing Pods keep their priority
fields, but preemption is disabled, and priority fields are ignored, and you
cannot set `priorityClassName` in new Pods.


## How to disable preemption

In Kubernetes 1.11 and later, preemption is controlled by a kube-scheduler flag `disablePreemption`, which is set to `false` by default.

If you want to disable preemption, just set `disablePreemption` to true. This will keep pod priority enabled while preemption is disabled. Here is a sample configuration:

```yaml
apiVersion: componentconfig/v1alpha1
kind: KubeSchedulerConfiguration
algorithmSource:
provider: DefaultProvider

...

disablePreemption: true

```

Please note: although preemption of scheduler is enabled by default, preemption will not happen if `PodPriority` feature is not available.

## PriorityClass

A PriorityClass is a non-namespaced object that defines a mapping from a priority
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