k8s.io/kubernetes@v1.29.3/pkg/kubelet/kubelet_resources.go (about)

     1  /*
     2  Copyright 2016 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 kubelet
    18  
    19  import (
    20  	"fmt"
    21  
    22  	"k8s.io/klog/v2"
    23  
    24  	"k8s.io/api/core/v1"
    25  	"k8s.io/kubernetes/pkg/api/v1/resource"
    26  )
    27  
    28  // defaultPodLimitsForDownwardAPI copies the input pod, and optional container,
    29  // and applies default resource limits. it returns a copy of the input pod,
    30  // and a copy of the input container (if specified) with default limits
    31  // applied. if a container has no limit specified, it will default the limit to
    32  // the node allocatable.
    33  // TODO: if/when we have pod level resources, we need to update this function
    34  // to use those limits instead of node allocatable.
    35  func (kl *Kubelet) defaultPodLimitsForDownwardAPI(pod *v1.Pod, container *v1.Container) (*v1.Pod, *v1.Container, error) {
    36  	if pod == nil {
    37  		return nil, nil, fmt.Errorf("invalid input, pod cannot be nil")
    38  	}
    39  
    40  	node, err := kl.getNodeAnyWay()
    41  	if err != nil {
    42  		return nil, nil, fmt.Errorf("failed to find node object, expected a node")
    43  	}
    44  	allocatable := node.Status.Allocatable
    45  	klog.InfoS("Allocatable", "allocatable", allocatable)
    46  	outputPod := pod.DeepCopy()
    47  	for idx := range outputPod.Spec.Containers {
    48  		resource.MergeContainerResourceLimits(&outputPod.Spec.Containers[idx], allocatable)
    49  	}
    50  
    51  	var outputContainer *v1.Container
    52  	if container != nil {
    53  		outputContainer = container.DeepCopy()
    54  		resource.MergeContainerResourceLimits(outputContainer, allocatable)
    55  	}
    56  	return outputPod, outputContainer, nil
    57  }