How to Retrieve Kubernetes Pod and Node Resource Usage Metrics Using the Go Client?

Retrieving Resource Usage Metrics of Kubernetes Pods and Nodes Using Go Client

The Kubernetes Go client offers extensive capabilities, but resource usage metrics retrieval isn't explicitly handled within its core functionality. However, the Kubernetes metrics package provides pregenerated clients to facilitate this specific task.

Utilizing the Metrics Client

To retrieve resource usage metrics, a specialized client is required for interacting with the metrics API. This client can be generated using a configuration that includes necessary authentication and authorization details.

Code Example

<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() {
    config, err := clientcmd.BuildConfigFromFlags("", "")
    if err != nil {
        panic(err)
    }

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

    // Fetch and display metrics for nodes and pods
    _ = mc.MetricsV1beta1().NodeMetricses().List(metav1.ListOptions{})
    _ = mc.MetricsV1beta1().PodMetricses(metav1.NamespaceAll).List(metav1.ListOptions{})
}</code>

Method Summary

Each method in the metrics client returns a corresponding structure for the specified resource type and namespace:

• NodeMetricses().Get() and NodeMetricses().List() provide CPU and memory usage for a single node or all nodes, respectively.
• PodMetricses().Get() and PodMetricses().List() offer similar functionality for a single pod or all pods in a namespace.

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