Kubernetes go-client to list out pod details similar to `kubectl get pods`

Question

I'm trying to use the Kubernetes client-go to access pod details in a cluster.

I want to use it to get the details of pods running in one particular namespace, similar to kubectl get pods -n <my namespace>.

The details I want are the name, status, ready, restarts and age of the pod.

How can I get those data?

Answer 1

So, I wrote a function that takes in a Kubernetes client (refer the client-go for details on making one) and a namespace and returns all the pods available-

func GetPods(client *meshkitkube.Client, namespace string) (*v1core.PodList, error) {
    // Create a pod interface for the given namespace
    podInterface := client.KubeClient.CoreV1().Pods(namespace)

    // List the pods in the given namespace
    podList, err := podInterface.List(context.TODO(), v1.ListOptions{})

    if err != nil {
        return nil, err
    }
    return podList, nil
}

After getting all the pods, I used a loop to run through all the pods and containers within each pod and manually got all the data I required-

// List all the pods similar to kubectl get pods -n <my namespace>
            for _, pod := range podList.Items {
                // Calculate the age of the pod
                podCreationTime := pod.GetCreationTimestamp()
                age := time.Since(podCreationTime.Time).Round(time.Second)

                // Get the status of each of the pods
                podStatus := pod.Status

                var containerRestarts int32
                var containerReady int
                var totalContainers int

                // If a pod has multiple containers, get the status from all
                for container := range pod.Spec.Containers {
                    containerRestarts += podStatus.ContainerStatuses[container].RestartCount
                    if podStatus.ContainerStatuses[container].Ready {
                        containerReady++
                    }
                    totalContainers++
                }

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

                // Append this to data to be printed in a table
                data = append(data, []string{name, ready, status, restarts, ageS})
            }

This will result in the exact same data as you would get when running kubectl get pods -n <my namespace>.