Kubectl get field-selector Support: Difference between revisions
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=External= | |||
* https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#get | |||
=Internal= | =Internal= | ||
* [[Kubectl#--fieldSelector|kubectl]] | * [[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> | |||
Note that you may be able to obtain the results expected from a field selector by using JSONPath filter expressions. For more details, see: {{Internal|Kubectl_get_JSONPath_Support#Filter_Expressions|kubectl get JSONPath Filter Expressions}} | |||
=Supported Fields for Field Selectors= | |||
* PVs: <code>metadata.name</code>, <code>metadata.namespace</code>. | |||
=Usage Examples= | |||
<syntaxhighlight lang='bash'> | <syntaxhighlight lang='bash'> | ||
kubectl get pods --all-namespaces -o wide --field-selector spec.nodeName=<node> | kubectl get pods --all-namespaces -o wide --field-selector spec.nodeName=<node> | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Latest revision as of 18:21, 17 May 2021
External
Internal
Overview
kubectl get ... --field-selector <expression>
--field-selector specifies a selector (field query) to filter the result on. It supports the expressions containing '=', '==', and '!=', which can be applied to multiple fields.
--field-selector key1=value1,key2=value2,key3!=value3
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 spec.claimRef.name fails with:
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"
Note that you may be able to obtain the results expected from a field selector by using JSONPath filter expressions. For more details, see:
Supported Fields for Field Selectors
- PVs:
metadata.name,metadata.namespace.
Usage Examples
kubectl get pods --all-namespaces -o wide --field-selector spec.nodeName=<node>