I am using a kube config file to fetch the pod CPU and MEM data using go-lang. I am stuck to fetch the HPA details, i.e I am trying to write the equivalent of "kubectl get hpa", so I can know I have applied hpa to known services or not.
Any help on this is highly appreciated.
I have tried the below so far.
kubeClient "k8s.io/client-go/kubernetes/typed/autoscaling/v1"
hpaWatch, err := kubeClient.AutoscalingV1().HorizontalPodAutoscalers("default").Watch(metav1.ListOptions{})But this is not working.
Here is the line you should have used:
hpas, err := clientset.AutoscalingV1().HorizontalPodAutoscalers("default").List(context.TODO(), metav1.ListOptions{})and the following is a complete and working example for listing HPAs. You should be able just copy-paste it and run it.
It was tested with client-go@0.19.0.
package main
import (
"context"
"flag"
"fmt"
"os"
"path/filepath"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
func main() {
var kubeconfig *string
if home := homeDir(); home != "" {
kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
} else {
kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
}
flag.Parse()
// use the current context in kubeconfig
config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
if err != nil {
panic(err.Error())
}
// create the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
panic(err.Error())
}
for {
hpas, err := clientset.AutoscalingV1().HorizontalPodAutoscalers("default").List(context.TODO(), metav1.ListOptions{})
if err != nil {
panic(err.Error())
}
for _, hpa := range hpas.Items {
fmt.Printf("%q\n", hpa.GetName())
}
time.Sleep(10 * time.Second)
}
}
func homeDir() string {
if h := os.Getenv("HOME"); h != "" {
return h
}
return os.Getenv("USERPROFILE") // windows
}