Kubectl patch --help

Update fields of a resource using strategic merge patch, a JSON merge patch, or a JSON patch.

 JSON and YAML formats are accepted.

Examples:
  # Partially update a node using a strategic merge patch, specifying the patch as JSON
  kubectl patch node k8s-node-1 -p '{"spec":{"unschedulable":true}}'

  # Partially update a node using a strategic merge patch, specifying the patch as YAML
  kubectl patch node k8s-node-1 -p $'spec:\n unschedulable: true'

  # Partially update a node identified by the type and name specified in "node.json" using strategic merge patch
  kubectl patch -f node.json -p '{"spec":{"unschedulable":true}}'

  # Update a container's image; spec.containers[*].name is required because it's a merge key
  kubectl patch pod valid-pod -p '{"spec":{"containers":[{"name":"kubernetes-serve-hostname","image":"new image"}]}}'

  # Update a container's image using a JSON patch with positional arrays
  kubectl patch pod valid-pod --type='json' -p='[{"op": "replace", "path": "/spec/containers/0/image", "value":"new
image"}]'

  # Update a deployment's replicas through the scale subresource using a merge patch.
  kubectl patch deployment nginx-deployment --subresource='scale' --type='merge' -p '{"spec":{"replicas":2}}'

Options:
    --allow-missing-template-keys=true:
	If true, ignore any errors in templates when a field or map key is missing in the template. Only applies to
	golang and jsonpath output formats.

    --dry-run='none':
	Must be "none", "server", or "client". If client strategy, only print the object that would be sent, without
	sending it. If server strategy, submit server-side request without persisting the resource.

    --field-manager='kubectl-patch':
	Name of the manager used to track field ownership.

    -f, --filename=[]:
	Filename, directory, or URL to files identifying the resource to update

    -k, --kustomize='':
	Process the kustomization directory. This flag can't be used together with -f or -R.

    --local=false:
	If true, patch will operate on the content of the file, not the server-side resource.

    -o, --output='':
	Output format. One of: (json, yaml, name, go-template, go-template-file, template, templatefile, jsonpath,
	jsonpath-as-json, jsonpath-file).

    -p, --patch='':
	The patch to be applied to the resource JSON file.

    --patch-file='':
	A file containing a patch to be applied to the resource.

    -R, --recursive=false:
	Process the directory used in -f, --filename recursively. Useful when you want to manage related manifests
	organized within the same directory.

    --show-managed-fields=false:
	If true, keep the managedFields when printing objects in JSON or YAML format.

    --subresource='':
	If specified, patch will operate on the subresource of the requested object. Must be one of [status scale].
	This flag is alpha and may change in the future.

    --template='':
	Template string or path to template file to use when -o=go-template, -o=go-template-file. The template format
	is golang templates [http://golang.org/pkg/text/template/#pkg-overview].

    --type='strategic':
	The type of patch being provided; one of [json merge strategic]

Usage:
  kubectl patch (-f FILENAME | TYPE NAME) [-p PATCH|--patch-file FILE] [options]

Use "kubectl options" for a list of global command-line options (applies to all commands).