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HomeBackend DevelopmentGolangHow to Retrieve Kubernetes Pod Logs using Go?

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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