How to Retrieve Pod Details from a Kubernetes Cluster Using the Go-client Library?

Retrieve Pod Details with Kubernetes Go-client

When working within a Kubernetes cluster, it is crucial to have a means of accessing pod details efficiently. The Kubernetes client-go library provides an interface for interacting with the cluster, enabling developers to retrieve a wide range of information.

One common task is to list all pods in a specific namespace, similar to using the kubectl command "kubectl get pods -n ". This operation requires obtaining information such as pod name, status, readiness, restart count, and age.

To accomplish this, we utilize the client-go library to interact with the Kubernetes API. The following code snippet demonstrates how to list pods within a given namespace:

<code class="go">func GetPods(client *meshkitkube.Client, namespace string) (*v1core.PodList, error) {
    podInterface := client.KubeClient.CoreV1().Pods(namespace)
    podList, err := podInterface.List(context.TODO(), v1.ListOptions{})
    if err != nil {
        return nil, err
    }
    return podList, nil
}</code>

Once we have retrieved the list of pods, we iterate through each pod and its containers to gather the necessary details:

<code class="go">for _, pod := range podList.Items {
    podCreationTime := pod.GetCreationTimestamp()
    age := time.Since(podCreationTime.Time).Round(time.Second)

    podStatus := pod.Status

    var containerRestarts int32
    var containerReady int
    var totalContainers int

    for container := range pod.Spec.Containers {
        containerRestarts += podStatus.ContainerStatuses[container].RestartCount
        if podStatus.ContainerStatuses[container].Ready {
            containerReady++
        }
        totalContainers++
    }

    name := pod.GetName()
    ready := fmt.Sprintf("%v/%v", containerReady, totalContainers)
    status := fmt.Sprintf("%v", podStatus.Phase)
    restarts := fmt.Sprintf("%v", containerRestarts)
    ageS := age.String()

    data = append(data, []string{name, ready, status, restarts, ageS})
}</code>

The resulting "data" variable contains an array of string arrays, representing the desired pod details: name, readiness, status, restart count, and age. This data can then be effortlessly printed or manipulated as required.

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