View source for Kubectl get field-selector Support

=External=
* https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#get

=Internal=
* [[Kubectl#--fieldSelector|kubectl]]


=Overview=

<syntaxhighlight lang='bash'>
kubectl get ... --field-selector <expression>
</syntaxhighlight>

<code>--field-selector</code> specifies a selector (field query) to filter the result on. It supports the expressions containing '=', '==', and '!=', which can be applied to multiple fields.

<syntaxhighlight lang='bash'>
--field-selector key1=value1,key2=value2,key3!=value3
</syntaxhighlight>

The server only supports a limited number of field queries per each resource type. Supported fields vary per type. For example, attempting to query a PV for <code>spec.claimRef.name</code> fails with:
<syntaxhighlight lang='text'>
Error from server (BadRequest): Unable to find "/v1, Resource=persistentvolumes" that match label selector "", field selector "spec.claimRef.name=something": "spec.claimRef.name" is not a known field selector: only "metadata.name", "metadata.namespace"
</syntaxhighlight>

=Usage Examples=

<syntaxhighlight lang='bash'>
kubectl get pods --all-namespaces -o wide --field-selector spec.nodeName=<node>
</syntaxhighlight>