使用apimachinery/client-go检索不包含标签的Kubernetes节点。

huangapple
go评论104阅读模式
英文:

Retrieve kubernetes nodes that do not contain label using apimachinery/client-go

问题

我想获取不包含标签的 kubernetes 节点列表（如果有的话）。

我已经使用 client-go 成功实现了相反的操作。

  1. labelSelector := metav1.LabelSelector{
  2. 	MatchLabels: map[string]string{
  3. 		"somelabel": "somevalue",
  4. 	},
  5. }
  6. labelMap, err := metav1.LabelSelectorAsMap(&labelSelector)
  7. if err != nil {
  8. 	return false, errors.Wrap(err, "将节点标签选择器转换为映射时出错")
  9. }
  10. nodeListOptions := metav1.ListOptions{
  11. 	LabelSelector: labels.SelectorFromSet(labelMap).String(),
  12. }
  13. nodes, err := clientset.CoreV1().Nodes().List(nodeListOptions)
  14. if err != nil {
  15. 	return false, errors.Wrap(err, "获取节点列表时出错")
  16. }

我想要实现的是将以下 kubectl 命令转换为 client-go 代码：

  1. kubectl get ns --selector='!label_name'

这个可行吗？

英文:

I want to fetch the list (if any) of kubernetes nodes that do not contain a label.

I have managed to do the opposite using client-go

  1. 	labelSelector := metav1.LabelSelector{
  2. 		MatchLabels: map[string]string{
  3. 			"somelabel": "somevalue",
  4. 		},
  5. 	}
  6. 	labelMap, err := metav1.LabelSelectorAsMap(&labelSelector)
  7. 	if err != nil {
  8. 		return false, errors.Wrap(err, "error converting node label selector to map")
  9. 	}
  10. 	nodeListOptions := metav1.ListOptions{
  11. 		LabelSelector: labels.SelectorFromSet(labelMap).String(),
  12. 	}
  13. 	nodes, err := clientset.CoreV1().Nodes().List(nodeListOptions)
  14. 	if err != nil {
  15. 		return false, errors.Wrap(err, "error getting node list")
  16. 	}

What I want to achieve is to convert the following kubectl invocation

  1. kubectl get ns --selector='!label_name'

into client-go code.

Is this feasible?

答案1

得分: 2

我认为你需要使用apimachinery的labels包中的Requirement 类型，并基于此创建Selector 构造。

  1. nodeReq, err := labels.NewRequirement("label_name", selection.DoesNotExist, []string{})
  2. 	if err != nil {
  3. 		return false, errors.Wrap(err, "error creating selector requirement")
  4. 	}
  5. 	selector := labels.NewSelector()
  6. 	selector = selector.Add(*nodeReq)
  7. 	if err != nil {
  8. 		return false, errors.Wrap(err, "error converting node label selector to map")
  9. 	}
  10. 	nodeListOptions := metav1.ListOptions{
  11. 		LabelSelector: selector.String(),
  12. 	}
  13. 	nodes, err := clientset.CoreV1().Nodes().List(nodeListOptions)
英文:

I think one has to use the Requirement type of the apimachinery's labels package and create Selector constructs based on this.

  1. nodeReq, err := labels.NewRequirement("label_name", selection.DoesNotExist, []string{})
  2. 	if err != nil {
  3. 		return false, errors.Wrap(err, "error creating selector requirement")
  4. 	}
  5. 	selector := labels.NewSelector()
  6. 	selector = selector.Add(*nodeReq)
  7. 	if err != nil {
  8. 		return false, errors.Wrap(err, "error converting node label selector to map")
  9. 	}
  10. 	nodeListOptions := metav1.ListOptions{
  11. 		LabelSelector: selector.String(),
  12. 	}
  13. 	nodes, err := clientset.CoreV1().Nodes().List(nodeListOptions)

huangapple
  • 本文由 发表于 2021年12月23日 02:51:02
  • 转载请务必保留本文链接：https://go.coder-hub.com/70453832.html
  • client-go
  • go
  • kubernetes
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定