Kubernetes Strategic Merge Patch: Difference between revisions
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=Overview= | =Overview= | ||
A strategic merge patch is a customized version of [[JSON Patch|JSON patch]] and it looks like an incomplete YAML specification of a | A strategic merge patch is a customized version of [[JSON Patch|JSON patch]] and it looks like an incomplete YAML specification of a Kubernetes resource. | ||
The SMP includes <tt>TypeMeta</tt> fields to establish the group/version/kind/name of the resource to patch, then just enough remaining fields to step into a nested structure to specify a new field value, e.g. an image tag. By default, an SMP replaces values. This is usually the desired behavior when the target value is a simple string, but may not be desired when the target value is a list. To change this default behavior, add a directive. Recognized directives in YAML patches are: | The SMP includes <tt>TypeMeta</tt> fields to establish the group/version/kind/name of the resource to patch, then just enough remaining fields to step into a nested structure to specify a new field value, e.g. an image tag. By default, an SMP replaces values. This is usually the desired behavior when the target value is a simple string, but may not be desired when the target value is a list. To change this default behavior, add a directive. Recognized directives in YAML patches are: |
Revision as of 17:32, 29 July 2021
External
- https://github.com/kubernetes/community/blob/master/contributors/devel/sig-api-machinery/strategic-merge-patch.md
- https://github.com/kubernetes-sigs/kustomize/blob/master/docs/glossary.md#patchstrategicmerge
Internal
Overview
A strategic merge patch is a customized version of JSON patch and it looks like an incomplete YAML specification of a Kubernetes resource.
The SMP includes TypeMeta fields to establish the group/version/kind/name of the resource to patch, then just enough remaining fields to step into a nested structure to specify a new field value, e.g. an image tag. By default, an SMP replaces values. This is usually the desired behavior when the target value is a simple string, but may not be desired when the target value is a list. To change this default behavior, add a directive. Recognized directives in YAML patches are:
- replace (the default)
- delete
Example
The following patch updates the amount of memory allocated to a container in a pod and changes it to 1024Mi
apiVersion: v1 kind: Pod metadata: name: my-pod spec: containers: - name: my-container resources: limits: memory: 1024Mi