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Merge master into dev-1.21 to keep in sync, plus latest API reference

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This sync merge includes API reference updates.
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Tim Bannister
2021-04-06 20:53:30 +01:00
parent 8dbf6671db d2bf43be4d 41f8e9da78
commit 965aa51daf
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content/en/docs/concepts/scheduling-eviction/assign-pod-node.md
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<!-- overview -->
You can constrain a {{< glossary_tooltip text="Pod" term_id="pod" >}} to only be able to run on particular
{{< glossary_tooltip text="Node(s)" term_id="node" >}}, or to prefer to run on particular nodes.
There are several ways to do this, and the recommended approaches all use
[label selectors](/docs/concepts/overview/working-with-objects/labels/) to make the selection.
You can constrain a {{< glossary_tooltip text="Pod" term_id="pod" >}} so that it can only run on particular set of
{{< glossary_tooltip text="Node(s)" term_id="node" >}}.
There are several ways to do this and the recommended approaches all use
[label selectors](/docs/concepts/overview/working-with-objects/labels/) to facilitate the selection.
Generally such constraints are unnecessary, as the scheduler will automatically do a reasonable placement
(e.g. spread your pods across nodes, not place the pod on a node with insufficient free resources, etc.)
but there are some circumstances where you may want more control on a node where a pod lands, for example to ensure
(e.g. spread your pods across nodes so as not place the pod on a node with insufficient free resources, etc.)
but there are some circumstances where you may want to control which node the pod deploys to - for example to ensure
that a pod ends up on a machine with an SSD attached to it, or to co-locate pods from two different
services that communicate a lot into the same availability zone.
<!-- body -->
## nodeSelector