How to Retrieve Detailed Pod Status Information Like kubectl Using the Kubernetes Go-Client?

Using Kubernetes Go-Client to Obtain Pod Status Information Displayed by kubectl

Introduction

When using the Kubernetes go-client, obtaining pod status information using pod.Status.Phase provides useful insights. However, it only displays simplified phases such as "Pending" and "Running." This article aims to guide you in retrieving detailed status information similar to what kubectl get pods provides in its "Status" column, specifically addressing statuses like "Init:0/1" and "PodInitializing."

Standard Server-Side Calculation of Status

Contrary to your assumption, calculating the "Status" displayed by kubectl is not typically performed on the client side. Instead, it is calculated at the server level.

Server-Side Calculation Process

The server utilizes various components to assemble the "Status" information:

• ServerPrint: This function uses the Kubernetes TablePrinter to format the output.
• TablePrinter: This type handles object formatting for human readability.
• PrintObj: This function determines the appropriate method to print the object, based on server-provided information.
• HumanReadablePrinter: This printer interprets the data returned by the server and converts it into a human-readable format.

Implications for Go-Client Usage

This server-side calculation implies that you do not usually need to recalculate the "Status" information on the client side. The information is provided by the server and can be accessed through the go-client.

Conclusion

Understanding the server-side calculation of pod status information helps you leverage the go-client effectively. By accessing this information directly from the server, you can obtain detailed insights into pod status, similar to the output provided by kubectl get pods, without the need for manual recalculation on the client side.

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