kubernetes/cmd/kubeadm/app/phases/kubelet/config.go

var applyKubeletConfigPatchesFunc …

// WriteConfigToDisk writes the kubelet config object down to a file
// Used at "kubeadm init" and "kubeadm upgrade" time
func WriteConfigToDisk(cfg *kubeadmapi.ClusterConfiguration, kubeletDir, patchesDir string, output io.Writer) error { … }

// ApplyPatchesToConfig applies the patches located in patchesDir to the KubeletConfiguration stored
// in the ClusterConfiguration.ComponentConfigs map.
func ApplyPatchesToConfig(cfg *kubeadmapi.ClusterConfiguration, patchesDir string) error { … }

// CreateConfigMap creates a ConfigMap with the generic kubelet configuration.
// Used at "kubeadm init" and "kubeadm upgrade" time
func CreateConfigMap(cfg *kubeadmapi.ClusterConfiguration, client clientset.Interface) error { … }

// createConfigMapRBACRules creates the RBAC rules for exposing the base kubelet ConfigMap in the kube-system namespace to unauthenticated users
func createConfigMapRBACRules(client clientset.Interface) error { … }

// writeConfigBytesToDisk writes a byte slice down to disk at the specific location of the kubelet config file
func writeConfigBytesToDisk(b []byte, kubeletDir string) error { … }

// applyKubeletConfigPatches reads patches from a directory and applies them over the input kubeletBytes
func applyKubeletConfigPatches(kubeletBytes []byte, patchesDir string, output io.Writer) ([]byte, error) { … }