controller-runtime: Index | Examples | Files

package controllerutil

import ""

Package controllerutil contains utility functions for working with and implementing Controllers.



Package Files

controllerutil.go doc.go

func AddFinalizer Uses

func AddFinalizer(o metav1.Object, finalizer string)

AddFinalizer accepts a metav1 object and adds the provided finalizer if not present.

func AddFinalizerWithError Uses

func AddFinalizerWithError(o runtime.Object, finalizer string) error

AddFinalizerWithError tries to convert a runtime object to a metav1 object and add the provided finalizer. It returns an error if the provided object cannot provide an accessor.

func RemoveFinalizer Uses

func RemoveFinalizer(o metav1.Object, finalizer string)

RemoveFinalizer accepts a metav1 object and removes the provided finalizer if present.

func RemoveFinalizerWithError Uses

func RemoveFinalizerWithError(o runtime.Object, finalizer string) error

RemoveFinalizerWithError tries to convert a runtime object to a metav1 object and remove the provided finalizer. It returns an error if the provided object cannot provide an accessor.

func SetControllerReference Uses

func SetControllerReference(owner, controlled metav1.Object, scheme *runtime.Scheme) error

SetControllerReference sets owner as a Controller OwnerReference on controlled. This is used for garbage collection of the controlled object and for reconciling the owner object on changes to controlled (with a Watch + EnqueueRequestForOwner). Since only one OwnerReference can be a controller, it returns an error if there is another OwnerReference with Controller flag set.

type AlreadyOwnedError Uses

type AlreadyOwnedError struct {
    Object metav1.Object
    Owner  metav1.OwnerReference

AlreadyOwnedError is an error returned if the object you are trying to assign a controller reference is already owned by another controller Object is the subject and Owner is the reference for the current owner

func (*AlreadyOwnedError) Error Uses

func (e *AlreadyOwnedError) Error() string

type MutateFn Uses

type MutateFn func() error

MutateFn is a function which mutates the existing object into it's desired state.

type OperationResult Uses

type OperationResult string

OperationResult is the action result of a CreateOrUpdate call

const (
    // OperationResultNone means that the resource has not been changed
    OperationResultNone OperationResult = "unchanged"
    // OperationResultCreated means that a new resource is created
    OperationResultCreated OperationResult = "created"
    // OperationResultUpdated means that an existing resource is updated
    OperationResultUpdated OperationResult = "updated"

func CreateOrUpdate Uses

func CreateOrUpdate(ctx context.Context, c client.Client, obj runtime.Object, f MutateFn) (OperationResult, error)

CreateOrUpdate creates or updates the given object in the Kubernetes cluster. The object's desired state must be reconciled with the existing state inside the passed in callback MutateFn.

The MutateFn is called regardless of creating or updating an object.

It returns the executed operation and an error.

This example creates or updates an existing deployment


package main

import (

    appsv1 ""
    corev1 ""
    metav1 ""

    logf ""

var (
    log = logf.Log.WithName("controllerutil-examples")

// This example creates or updates an existing deployment
func main() {
    // c is client.Client

    // Create or Update the deployment default/foo
    deploy := &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "default"}}

    op, err := controllerutil.CreateOrUpdate(context.TODO(), c, deploy, func() error {

        // Deployment selector is immutable so we set this value only if
        // a new object is going to be created
        if deploy.ObjectMeta.CreationTimestamp.IsZero() {
            deploy.Spec.Selector = &metav1.LabelSelector{
                MatchLabels: map[string]string{"foo": "bar"},

        // update the Deployment pod template
        deploy.Spec.Template = corev1.PodTemplateSpec{
            ObjectMeta: metav1.ObjectMeta{
                Labels: map[string]string{
                    "foo": "bar",
            Spec: corev1.PodSpec{
                Containers: []corev1.Container{
                        Name:  "busybox",
                        Image: "busybox",

        return nil

    if err != nil {
        log.Error(err, "Deployment reconcile failed")
    } else {
        log.Info("Deployment successfully reconciled", "operation", op)

Package controllerutil imports 10 packages (graph) and is imported by 213 packages. Updated 2020-01-14. Refresh now. Tools for package owners.