How Do I Retrieve Detailed Pod Status Information Using the Kubernetes Go Client?

How to Retrieve Pod Status Details Using Kubernetes Go Client

Overview

This article discusses methods to access detailed Pod status information similar to that provided by the kubectl get pods command using the Kubernetes Go client (k8s.io/client-go/kubernetes).

Getting pod.Status.Phase

To obtain the Pod Phase, use the following code:

<code class="go">pods, err := api.Pods("").List(metav1.ListOptions{})
for _, pod := range pods.Items {
    podstatusPhase := string(pod.Status.Phase)
    // ...
}</code>

Retrieving Advanced Status Information

To obtain advanced status information, such as "Init:0/1" and "PodInitializing," it isn't necessary to perform calculations on the client side.

Server-Side Calculation

The kubectl get pods command uses ServerPrint, which in turn uses TablePrinter to calculate the Status column information. This calculation occurs on the server (kube-apiserver) side using Pod Status Conditions and container statuses.

Client-Side Alternative

If the server-side calculation is not available, you can attempt to manually calculate the status information using the following resources:

• Pod Status Conditions (k8s.io/api/core/v1.PodCondition)
• Container statuses (runtime_api.PodStatus.ContainerStatuses)

However, this approach requires a deep understanding of Kubernetes status handling, and the calculations may change based on Kubernetes versions.

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