func getProbeAddress(addr string) string {
	if addr == "0.0.0.0" || addr == "::" {
		return ""
	}
	return addr
}

// GetUsersAndGroups returns the local usersAndGroups, but first creates it
// in a thread safe way once.
func GetUsersAndGroups() (*users.UsersAndGroups, error) {
	var err error
	usersAndGroupsOnce.Do(func() {
		usersAndGroups, err = users.AddUsersAndGroups()
	})

		if isDryRun {
			fmt.Printf("[control-plane] Would create users and groups for %+v to run as non-root\n", componentNames)
		} else {
			usersAndGroups, err = staticpodutil.GetUsersAndGroups()
			if err != nil {
				return errors.Wrap(err, "failed to create users and groups")
			}
		}
	}

	// creates required static pod specs
	for _, componentName := range componentNames {

			fmt.Printf("[etcd] Would update static pod manifest for %q to run run as non-root\n", kubeadmconstants.Etcd)
		} else {
			usersAndGroups, err = staticpodutil.GetUsersAndGroups()
			if err != nil {
				return errors.Wrap(err, "failed to create users and groups")
			}
			// usersAndGroups is nil on non-linux.
			if usersAndGroups != nil {