}

// ConfigMapEnvSource selects a ConfigMap to populate the environment
// variables with.
//
// The contents of the target ConfigMap's Data field will represent the
// key-value pairs as environment variables.
message ConfigMapEnvSource {
  // The ConfigMap to select from.
  optional LocalObjectReference localObjectReference = 1;

  // Specify whether the ConfigMap must be defined
  // +optional

}

func (ConfigMapEnvSource) SwaggerDoc() map[string]string {
	return map_ConfigMapEnvSource
}

var map_ConfigMapKeySelector = map[string]string{
	"":         "Selects a key from a ConfigMap.",
	"key":      "The key to select.",
	"optional": "Specify whether the ConfigMap or its key must be defined",
}

func (ConfigMapKeySelector) SwaggerDoc() map[string]string {

}

// ConfigMapEnvSource selects a ConfigMap to populate the environment
// variables with.
//
// The contents of the target ConfigMap's Data field will represent the
// key-value pairs as environment variables.
type ConfigMapEnvSource struct {
	// The ConfigMap to select from.
	LocalObjectReference
	// Specify whether the ConfigMap must be defined
	// +optional
	Optional *bool
}

}

// ConfigMapEnvSource selects a ConfigMap to populate the environment
// variables with.
//
// The contents of the target ConfigMap's Data field will represent the
// key-value pairs as environment variables.
message ConfigMapEnvSource {
  // The ConfigMap to select from.
  optional LocalObjectReference localObjectReference = 1;

  // Specify whether the ConfigMap must be defined
  // +optional

	// +k8s:deprecated=apiVersion
	// +k8s:deprecated=configMapRef,protobuf=1

	// ConfigMap is a reference to a Node's ConfigMap
	ConfigMap *ConfigMapNodeConfigSource `json:"configMap,omitempty" protobuf:"bytes,2,opt,name=configMap"`
}

// ConfigMapNodeConfigSource contains the information to reference a ConfigMap as a config source for the Node.

		return err
	}
	if err := s.AddGeneratedConversionFunc((*v1.ConfigMap)(nil), (*core.ConfigMap)(nil), func(a, b interface{}, scope conversion.Scope) error {
		return Convert_v1_ConfigMap_To_core_ConfigMap(a.(*v1.ConfigMap), b.(*core.ConfigMap), scope)
	}); err != nil {
		return err
	}
	if err := s.AddGeneratedConversionFunc((*core.ConfigMap)(nil), (*v1.ConfigMap)(nil), func(a, b interface{}, scope conversion.Scope) error {

		}
	}
	if source.ConfigMap != nil {
		if numVolumes > 0 {
			allErrs = append(allErrs, field.Forbidden(fldPath.Child("configMap"), "may not specify more than 1 volume type"))
		} else {
			numVolumes++
			allErrs = append(allErrs, validateConfigMapVolumeSource(source.ConfigMap, fldPath.Child("configMap"))...)
		}
	}

	if source.AzureFile != nil {
		if numVolumes > 0 {

* Native support for token based bootstrap flow.  This includes signing a well known ConfigMap in the `kube-public` namespace and cleaning out expired tokens. ([#36101](https://github.com/kubernetes/kubernetes/pull/36101), [@jbeda](https://github.com/jbeda))

### ConfigMap

* You must now specify `Node.Spec.ConfigSource.ConfigMap.KubeletConfigKey` when using dynamic Kubelet config to tell the Kubelet which key of the `ConfigMap` identifies its config file. ([#59847](https://github.com/kubernetes/kubernetes/pull/59847), [@mtaufen](https://github.com/mtaufen))

```

If your cluster was installed by kubeadm, you should edit the `featureGates` field in the `kubeadm-config` ConfigMap. You can do this using `kubectl -n kube-system edit cm kubeadm-config` before upgrading. For example:

kubeadm-config Before:

```
apiVersion: v1
kind: ConfigMap
metadata:
  name: kubeadm-config
data:
  MasterConfiguration: |
    kubeProxy:
      config: