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Create pod eviction concept topic #27739

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May 20, 2021
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Create pod eviction concept topic #27739

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26 changes: 26 additions & 0 deletions content/en/docs/concepts/scheduling-eviction/_index.md
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@@ -1,11 +1,37 @@
---
title: "Scheduling, Preemption and Eviction"
weight: 90
content_type: concept
description: >
In Kubernetes, scheduling refers to making sure that Pods are matched to Nodes
so that the kubelet can run them. Preemption is the process of terminating
Pods with lower Priority so that Pods with higher Priority can schedule on
Nodes. Eviction is the process of proactively terminating one or more Pods on
resource-starved Nodes.
no_list: true
---

In Kubernetes, scheduling refers to making sure that {{<glossary_tooltip text="Pods" term_id="pod">}}
are matched to {{<glossary_tooltip text="Nodes" term_id="node">}} so that the
{{<glossary_tooltip text="kubelet" term_id="kubelet">}} can run them. Preemption
is the process of terminating Pods with lower {{<glossary_tooltip text="Priority" term_id="pod-priority">}}
so that Pods with higher Priority can schedule on Nodes. Eviction is the process
of terminating one or more Pods on Nodes.

## Scheduling

* [Kubernetes Scheduler](/docs/concepts/scheduling-eviction/kube-scheduler/)
* [Assigning Pods to Nodes](/docs/concepts/scheduling-eviction/assign-pod-node/)
* [Pod Overhead](/docs/concepts/scheduling-eviction/pod-overhead/)
* [Taints and Tolerations](/docs/concepts/scheduling-eviction/taint-and-toleration/)
* [Scheduling Framework](/docs/concepts/scheduling-eviction/scheduling-framework)
* [Scheduler Performance Tuning](/docs/concepts/scheduling-eviction/scheduler-perf-tuning/)
* [Resource Bin Packing for Extended Resources](/docs/concepts/scheduling-eviction/resource-bin-packing/)

## Pod Disruption
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{{<glossary_definition term_id="pod-disruption" length="all">}}

* [Pod Priority and Preemption](/docs/concepts/scheduling-eviction/pod-priority-preemption/)
* [Node-pressure Eviction](/docs/concepts/scheduling-eviction/node-pressure-eviction/)
* [API-initiated Eviction](/docs/concepts/scheduling-eviction/api-eviction/)
19 changes: 19 additions & 0 deletions content/en/docs/concepts/scheduling-eviction/api-eviction.md
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---
title: API-initiated Eviction
content_type: concept
weight: 70
---

{{< glossary_definition term_id="api-eviction" length="short" >}} </br>

You can request eviction by directly calling the Eviction API
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Link to https://kubernetes.io/docs/tasks/administer-cluster/safely-drain-node/#eviction-api ?

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It is linked in the glossary definition (so looks OK in staging at: https://deploy-preview-27739--kubernetes-io-master-staging.netlify.app/docs/concepts/scheduling-eviction/api-eviction/)

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looks good.

Now, I think some of the contents of https://kubernetes.io/docs/tasks/administer-cluster/safely-drain-node/#eviction-api can be put here as well. Note that that doc is a "task", meaning that it has a tutorial structure. In "concepts", we should make it more descriptive, explaining the fields and responses. But this is definitely for a follow up.

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I'll create a new issue for this after we publish this doc

using a client of the kube-apiserver, like the `kubectl drain` command.
This creates an `Eviction` object, which causes the API server to terminate the Pod.

API-initiated evictions respect your configured [`PodDisruptionBudgets`](/docs/tasks/run-application/configure-pdb/)
and [`terminationGracePeriodSeconds`](/docs/concepts/workloads/pods/pod-lifecycle#pod-termination).

## {{% heading "whatsnext" %}}

* Learn about [Node-pressure Eviction](/docs/concepts/scheduling-eviction/node-pressure-eviction/)
* Learn about [Pod Priority and Preemption](/docs/concepts/scheduling-eviction/pod-priority-preemption/)
24 changes: 0 additions & 24 deletions content/en/docs/concepts/scheduling-eviction/eviction-policy.md
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2 changes: 0 additions & 2 deletions content/en/docs/concepts/scheduling-eviction/kube-scheduler.md
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Expand Up @@ -77,11 +77,9 @@ one of these at random.
There are two supported ways to configure the filtering and scoring behavior
of the scheduler:


1. [Scheduling Policies](/docs/reference/scheduling/policies) allow you to configure _Predicates_ for filtering and _Priorities_ for scoring.
1. [Scheduling Profiles](/docs/reference/scheduling/config/#profiles) allow you to configure Plugins that implement different scheduling stages, including: `QueueSort`, `Filter`, `Score`, `Bind`, `Reserve`, `Permit`, and others. You can also configure the kube-scheduler to run different profiles.


## {{% heading "whatsnext" %}}

* Read about [scheduler performance tuning](/docs/concepts/scheduling-eviction/scheduler-perf-tuning/)
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