23 lines
947 B
Markdown
23 lines
947 B
Markdown
---
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title: Affinity
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id: affinity
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date: 2019-01-11
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full_link: /docs/concepts/scheduling-eviction/assign-pod-node/#affinity-and-anti-affinity
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short_description: >
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Rules used by the scheduler to determine where to place pods
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aka:
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tags:
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- fundamental
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---
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In Kubernetes, _affinity_ is a set of rules that give hints to the scheduler about where to place pods.
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<!--more-->
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There are two kinds of affinity:
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* [node affinity](/docs/concepts/scheduling-eviction/assign-pod-node/#node-affinity)
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* [pod-to-pod affinity](/docs/concepts/scheduling-eviction/assign-pod-node/#inter-pod-affinity-and-anti-affinity)
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The rules are defined using the Kubernetes {{< glossary_tooltip term_id="label" text="labels">}},
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and {{< glossary_tooltip term_id="selector" text="selectors">}} specified in {{< glossary_tooltip term_id="pod" text="pods" >}},
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and they can be either required or preferred, depending on how strictly you want the scheduler to enforce them.
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