CODEWITHSUNDEEP
kuberneteskubernetes-go-client
Iris Ding
Iris Ding

Reputation: 164

how to get a node's private IP using kubernetes go-client?

In my kubernetes cluster, all nodes have both a public IP and a private IP. I am using kubernetes go-client and want to get node's private IP like below code snippet:

for _, addr := range n.Status.Addresses {
    if addr.Type == kube_api.NodeInternalIP && addr.Address != "" {
        fmt.Println("internal IP")
        nodeIP = addr.Address
        fmt.Println(nodeIP)
    }
    if addr.Type == kube_api.NodeExternalIP && addr.Address != "" {
        fmt.Println("external IP")
        nodeIP = addr.Address
        fmt.Println(nodeIP)
    }
    if addr.Type == kube_api.NodeLegacyHostIP && addr.Address != "" {
        fmt.Println("lgeacyhost IP")
        nodeIP = addr.Address
        fmt.Println(nodeIP)
    }
}

However, the NodeInternalIP and NodeExternalIP all returns the public IP.

Is there a way to get the private IP of a node?

Thanks a lot.

Upvotes: 0

Views: 3557

Answers (2)

vsxen
vsxen

Reputation: 781

package main

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

    _ "net/http/pprof"

    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    corev1 "k8s.io/api/core/v1"
    "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()
    // uses the current context in kubeconfig
    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)
}

Upvotes: 0

Mayur Nagekar
Mayur Nagekar

Reputation: 811

This should provide you the node's Internal private IP

kubectl get nodes -o jsonpath='{.items[*].status.addresses[?(@.type=="InternalIP")].address}'

172.20.38.232 172.20.48.54 172.20.53.226 172.20.55.210

Upvotes: 0

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