Kubernetes go-client: Retrieve Pod Details Like kubectl get pods

To obtain pod details in a Kubernetes cluster using the client-go library, similar to the kubectl get pods -n command, follow these steps:

Create a Kubernetes client: Refer to the client-go documentation for details on obtaining a Kubernetes client.

Specify the target namespace: Determine the namespace where the desired pods reside, similar to the -n option in kubectl.

Retrieve the pod list: Utilize the client's CoreV1() method to interface with the Pods resource within the specified namespace. Use the List() method to obtain a PodList object containing all pods in the namespace.

Extract pod information: Iterate through the PodList, accessing each pod's metadata and status information. For detailed information, refer to the Pod and PodStatus struct definitions in the Kubernetes API documentation.

Extract additional details: If required, calculate attributes such as pod age, container restarts, and ready status using the pod's creation timestamp and container statuses.

Here's a sample code snippet that demonstrates how to get the pod name, status, ready status, restarts, and age:

func GetPods(client *meshkitkube.Client, namespace string) (*v1core.PodList, error) {
    podInterface := client.KubeClient.CoreV1().Pods(namespace)
    podList, err := podInterface.List(context.TODO(), v1.ListOptions{})
    return podList, err
}

// Iterate through pods and collect required data
for _, pod := range podList.Items {
    podCreationTime := pod.GetCreationTimestamp()
    age := time.Since(podCreationTime.Time).Round(time.Second)
    podStatus := pod.Status
    containerRestarts, containerReady, totalContainers := 0, 0, len(pod.Spec.Containers)
    for container := range pod.Spec.Containers {
        containerRestarts  = podStatus.ContainerStatuses[container].RestartCount
        if podStatus.ContainerStatuses[container].Ready {
            containerReady  
        }
    }
    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})
}

This process will provide the same data that kubectl get pods -n offers.