go - 如何为 KubeBuilder 的 List 方法的 `ListOptions` 提供 Owner 引用？

Question

我想使用 Kubuilder 的 List(ctx context.Context, list ObjectList, opts ...ListOption) 列出 Kubernetes 集群中资源 X 拥有的 pod方法。 ListOptions 包含用于限制或过滤结果的选项。这是ListOptions

的结构

type ListOptions struct {
    // LabelSelector filters results by label. Use labels.Parse() to
    // set from raw string form.
    LabelSelector labels.Selector
    // FieldSelector filters results by a particular field.  In order
    // to use this with cache-based implementations, restrict usage to
    // a single field-value pair that's been added to the indexers.
    FieldSelector fields.Selector

    // Namespace represents the namespace to list for, or empty for
    // non-namespaced objects, or to list across all namespaces.
    Namespace string

    // Limit specifies the maximum number of results to return from the server. The server may
    // not support this field on all resource types, but if it does and more results remain it
    // will set the continue field on the returned list object. This field is not supported if watch
    // is true in the Raw ListOptions.
    Limit int64
    // Continue is a token returned by the server that lets a client retrieve chunks of results
    // from the server by specifying limit. The server may reject requests for continuation tokens
    // it does not recognize and will return a 410 error if the token can no longer be used because
    // it has expired. This field is not supported if watch is true in the Raw ListOptions.
    Continue string

    // Raw represents raw ListOptions, as passed to the API server.  Note
    // that these may not be respected by all implementations of interface,
    // and the LabelSelector, FieldSelector, Limit and Continue fields are ignored.
    Raw *metav1.ListOptions
}

现在，我如何向此 ListOptions 提供所有者信息，以便 List 方法仅列出 X 拥有的 pod ？

这是 KubeBuilder 书中的一个示例，展示了如何按特定字段过滤结果，

  listOps := &client.ListOptions{
        FieldSelector: fields.OneTermEqualSelector(configMapField, configMap.GetName()),
        Namespace:     configMap.GetNamespace(),
  }
  err := r.List(context.TODO(), attachedConfigDeployments, listOps)

Answer 1

不幸的是，不可能对资源的每个字段使用字段选择器。例如，在您的情况下，您只能使用 these fields作为字段选择器。 this thread中也有说明。 .

或者，您可以将标签添加到自定义资源拥有的 Pod 中并使用标签选择器。或者，您可以获取所有 pod 并应用编程过滤器来获取必要的 pod。 (我推荐第一种方法，因为 metadata.ownerReferences 是一个数组，成本为 O(n^2))