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honor KUBECONFIG environment variable #28

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3a31269
honor KUBECONFIG environment variable
rogeliodh May 14, 2025
ae2a92c
update README to document usage of KUBECONFIG envvar
rogeliodh May 14, 2025
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12 changes: 6 additions & 6 deletions README.md
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Expand Up @@ -14,7 +14,7 @@ You no longer have to wait for that `prometheus` and `grafana` - Just check the

![Alt text](assets/KubeNodeUsage3.0.4.gif)

KubeNodeUsage use your local KubeConfig file to connect to the cluster and use Kubernetes API directly using Kubernetes GO SDK
KubeNodeUsage use your local kubeconfig file to connect to the cluster and use Kubernetes API directly using Kubernetes GO SDK

It fetches the Node and Pod Metrics from Kubernetes API and apply filters and aggreations to display it in a nice human readable Graphical format as Bar Charts.

Expand Down Expand Up @@ -123,17 +123,17 @@ I have tested KubeNodeUsage starting from **1.19 - 1.29** ( the latest stable ve

KubeNodeUsage is written in `GoLang` and uses `client-go` and `kubernetes` SDK libraries

When you start KubeNodeUsage - It try to read the `$HOME/.kube/config` file in your HOME directory
When you start KubeNodeUsage - It first checks for the `KUBECONFIG` environment variable. If set, it will use that path for the Kubernetes configuration. If not set, it falls back to reading the `$HOME/.kube/config` file in your HOME directory.

KubeNodeUsage connects to the Default cluster set by the `CurrentContext` on the ./kube/config file
KubeNodeUsage connects to the Default cluster set by the `CurrentContext` on the kubeconfig file.

You can manually edit this file and update it but the recommended way to update current-context is to use `kubectl config use-context`

KubeNodeUsage does not use `kubectl` directly and it relies on the `.kube/config` file and the authentication method defined in there
KubeNodeUsage does not use `kubectl` directly and it relies on the kubeconfig file and the authentication method defined in there

KubeNodeUsage works the same way - kubectl works based on the configuration information found on .kube/config file
KubeNodeUsage works the same way - kubectl works based on the configuration information found on the kubeconfig file

If the `kubectl`commands are not working - its highly likely KubeNodeUsage would fail too - In this case you have to check your Kube config file
If the `kubectl` commands are not working - its highly likely KubeNodeUsage would fail too - In this case you have to check your kubeconfig file

 

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11 changes: 8 additions & 3 deletions k8s/nodes.go
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Expand Up @@ -100,7 +100,10 @@ type KubeletStats struct {
}

func ClusterInfo() Cluster {
kubeconfig := filepath.Join(os.Getenv("HOME"), ".kube", "config")
kubeconfig := os.Getenv("KUBECONFIG")
if kubeconfig == "" {
kubeconfig = filepath.Join(os.Getenv("HOME"), ".kube", "config")
}
confvar := clientcmd.GetConfigFromFileOrDie(kubeconfig)

K8sinfo := Cluster{}
Expand Down Expand Up @@ -348,11 +351,13 @@ func getPodStats(clientset *kubernetes.Clientset, node *core.Node, podName strin
}

func Nodes(inputs *utils.Inputs) (NodeStatsList []Node) {

metric := inputs.Metrics

utils.InitLogger()
kubeconfig := filepath.Join(os.Getenv("HOME"), ".kube", "config")
kubeconfig := os.Getenv("KUBECONFIG")
if kubeconfig == "" {
kubeconfig = filepath.Join(os.Getenv("HOME"), ".kube", "config")
}

config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
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5 changes: 4 additions & 1 deletion k8s/pods.go
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Expand Up @@ -43,7 +43,10 @@ func Pods(inputs *utils.Inputs) (PodStatsList []Pod) {
metric := inputs.Metrics

utils.InitLogger()
kubeconfig := filepath.Join(os.Getenv("HOME"), ".kube", "config")
kubeconfig := os.Getenv("KUBECONFIG")
if kubeconfig == "" {
kubeconfig = filepath.Join(os.Getenv("HOME"), ".kube", "config")
}

config, err := clientcmd.BuildConfigFromFlags("", kubeconfig)
if err != nil {
Expand Down