Go - get server address from kubeconfig file

Basically, my kubeconfig file has:

apiVersion: v1
clusters:
 - cluster:
      server: <OAM ip address> this is what I want
(...)

I want to get the server address. Previously searching , I've found this solution:

config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
if err != nil {
    panic(err.Error())
}
// creates the clientset
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
    panic(err.Error())
}

nodes, err := clientset.CoreV1().Nodes().List(metav1.ListOptions{})
if err != nil {
    panic(err)
}
nodeip := []corev1.NodeAddress{}
for i := 0; i < len(nodes.Items); i++ {
    nodeip = nodes.Items[i].Status.Addresses
    fmt.Println(nodeip[0].Address)
}
fmt.Println(nodes.Items[0].Status.Addresses)

But it gives me the Internal IP, not the OAM server IP (which is inside the Kubernetes config file)

If you want the server address from the kubeconfig file, just read it from your config variable:

package main

import (
    "flag"
    "fmt"
    "path/filepath"

    "k8s.io/client-go/kubernetes"
    "k8s.io/client-go/tools/clientcmd"
    "k8s.io/client-go/util/homedir"
)

func main() {
    var kubeconfig *string

    if home := homedir.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()

    config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
    if err != nil {
        panic(err)
    }

    fmt.Printf("server: %s\n", config.Host)
}

If you're curious what other fields are available on the rest.Config object, a quick solution is to print out the config variable using the %+v format specifier:

fmt.Printf("%+v\n", config)

For more details, look at the reference documentation.