nodelease.go

Documentation: k8s.io/kubernetes/pkg/kubelet/util

     1  /*
     2  Copyright 2020 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package util
    18  
    19  import (
    20  	"context"
    21  
    22  	coordinationv1 "k8s.io/api/coordination/v1"
    23  	corev1 "k8s.io/api/core/v1"
    24  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    25  	clientset "k8s.io/client-go/kubernetes"
    26  
    27  	"k8s.io/klog/v2"
    28  )
    29  
    30  // SetNodeOwnerFunc helps construct a newLeasePostProcessFunc which sets
    31  // a node OwnerReference to the given lease object
    32  func SetNodeOwnerFunc(c clientset.Interface, nodeName string) func(lease *coordinationv1.Lease) error {
    33  	return func(lease *coordinationv1.Lease) error {
    34  		// Setting owner reference needs node's UID. Note that it is different from
    35  		// kubelet.nodeRef.UID. When lease is initially created, it is possible that
    36  		// the connection between master and node is not ready yet. So try to set
    37  		// owner reference every time when renewing the lease, until successful.
    38  		if len(lease.OwnerReferences) == 0 {
    39  			if node, err := c.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{}); err == nil {
    40  				lease.OwnerReferences = []metav1.OwnerReference{
    41  					{
    42  						APIVersion: corev1.SchemeGroupVersion.WithKind("Node").Version,
    43  						Kind:       corev1.SchemeGroupVersion.WithKind("Node").Kind,
    44  						Name:       nodeName,
    45  						UID:        node.UID,
    46  					},
    47  				}
    48  			} else {
    49  				klog.ErrorS(err, "Failed to get node when trying to set owner ref to the node lease", "node", klog.KRef("", nodeName))
    50  				return err
    51  			}
    52  		}
    53  		return nil
    54  	}
    55  }
    56
View as plain text