How to Retrieve Kubernetes Pod Logs using Go?

Getting Logs from Kubernetes Pods in Go

As outlined, obtaining logs from pods within a Kubernetes cluster using Go can be achieved. Both the client-go and controller-runtime libraries offer solutions for this task.

The example provided, which retrieves job information using controller-runtime's Get() function, highlights the versatility of Go's client-side libraries.

Using client-go Library

An effective approach using client-go involves creating a podLogOptions object and initializing a clientset to gain access to the Kubernetes API. A request is then made to the clientset using corev1's Pods() method to retrieve logs from a specific pod.

Here's an updated code snippet using client-go:

func getPodLogs(pod corev1.Pod) string {
    podLogOpts := corev1.PodLogOptions{}
    config, err := rest.InClusterConfig()
    if err != nil {
        return "error in getting config"
    }
    clientset, err := kubernetes.NewForConfig(config)
    if err != nil {
        return "error in getting access to K8S"
    }
    req := clientset.CoreV1().Pods(pod.Namespace).GetLogs(pod.Name, &podLogOpts)
    podLogs, err := req.Stream()
    if err != nil {
        return "error in opening stream"
    }
    defer podLogs.Close()

    buf := new(bytes.Buffer)
    _, err = io.Copy(buf, podLogs)
    if err != nil {
        return "error in copy information from podLogs to buf"
    }
    str := buf.String()

    return str
}

This approach simplifies the process of obtaining pod logs, providing a clear understanding of the required steps.

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