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?
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>
.