How do I Query Resource Usage of Pods and Nodes in Kubernetes with Go?

Querying Resource Usage of Pods and Nodes in Kubernetes with Go

The Kubernetes Go client provides numerous methods for managing resources, but it lacks direct support for fetching resource usage data. To obtain this information, you can leverage the Kubernetes metrics package.

Fetching Resource Usage with the Metrics Package

The metrics package offers a client that enables you to access resource usage data. Here's a simplified example of the client initialization:

<code class="go">import (
    "k8s.io/client-go/tools/clientcmd"
    metrics "k8s.io/metrics/pkg/client/clientset/versioned"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

func main() {
    // Assuming using in-cluster configuration
    config, err := clientcmd.BuildConfigFromFlags("", "")
    if err != nil {
        panic(err)
    }

    mc, err := metrics.NewForConfig(config)
    if err != nil {
        panic(err)
    }

    // Available methods for resource usage
    _ = mc.MetricsV1beta1().NodeMetricses().Get("your node name", metav1.GetOptions{})
    _ = mc.MetricsV1beta1().NodeMetricses().List(metav1.ListOptions{})
    _ = mc.MetricsV1beta1().PodMetricses(metav1.NamespaceAll).List(metav1.ListOptions{})
    _ = mc.MetricsV1beta1().PodMetricses(metav1.NamespaceAll).Get("your pod name", metav1.GetOptions{})
}</code>

These methods return appropriate structures containing the resource usage information for nodes and pods.

Additional Information

• The "your node name" and "your pod name" arguments should be replaced with the actual node or pod names you wish to query.
• The metrics package provides structures such as NodeMetrics for node usage and PodMetrics for pod usage.
• For more comprehensive examples, refer to the Kubernetes documentation: https://github.com/kubernetes/client-go/tree/master/metrics

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