从kubeconfig文件中获取服务器地址

huangapple
go评论107阅读模式
英文:

Go - get server address from kubeconfig file

问题

基本上，我的kubeconfig文件包含：

  1. apiVersion: v1
  2. clusters:
  3.  - cluster:
  4.       server: <OAM IP地址> 这就是我想要的
  5. (...)

我想要获取服务器地址。
之前搜索时，我找到了这个解决方案：

  1. config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
  2. if err != nil {
  3.     panic(err.Error())
  4. }
  5. // 创建clientset
  6. clientset, err := kubernetes.NewForConfig(config)
  7. if err != nil {
  8.     panic(err.Error())
  9. }
  11. nodes, err := clientset.CoreV1().Nodes().List(metav1.ListOptions{})
  12. if err != nil {
  13.     panic(err)
  14. }
  15. nodeip := []corev1.NodeAddress{}
  16. for i := 0; i < len(nodes.Items); i++ {
  17.     nodeip = nodes.Items[i].Status.Addresses
  18.     fmt.Println(nodeip[0].Address)
  19. }
  20. fmt.Println(nodes.Items[0].Status.Addresses)

但它给我返回的是内部IP，而不是OAM服务器IP（它在Kubernetes配置文件中）。

英文:

Basically, my kubeconfig file has:

  1. apiVersion: v1
  2. clusters:
  3.  - cluster:
  4.       server: &lt;OAM ip address&gt; this is what I want
  5. (...)

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

  1. config, err := clientcmd.BuildConfigFromFlags(&quot;&quot;, *kubeconfig)
  2. if err != nil {
  3.     panic(err.Error())
  4. }
  5. // creates the clientset
  6. clientset, err := kubernetes.NewForConfig(config)
  7. if err != nil {
  8.     panic(err.Error())
  9. }
  11. nodes, err := clientset.CoreV1().Nodes().List(metav1.ListOptions{})
  12. if err != nil {
  13.     panic(err)
  14. }
  15. nodeip := []corev1.NodeAddress{}
  16. for i := 0; i &lt; len(nodes.Items); i++ {
  17.     nodeip = nodes.Items[i].Status.Addresses
  18.     fmt.Println(nodeip[0].Address)
  19. }
  20. 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)

答案1

得分: 1

如果你想从kubeconfig文件中获取服务器地址，只需从你的config变量中读取即可：

  1. package main
  3. import (
  4. 	"flag"
  5. 	"fmt"
  6. 	"path/filepath"
  8. 	"k8s.io/client-go/kubernetes"
  9. 	"k8s.io/client-go/tools/clientcmd"
  10. 	"k8s.io/client-go/util/homedir"
  11. )
  13. func main() {
  14. 	var kubeconfig *string
  16. 	if home := homedir.HomeDir(); home != "" {
  17. 		kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
  18. 	} else {
  19. 		kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
  20. 	}
  22. 	flag.Parse()
  24. 	config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
  25. 	if err != nil {
  26. 		panic(err)
  27. 	}
  29. 	fmt.Printf("server: %s\n", config.Host)
  30. }

如果你想知道rest.Config对象上还有哪些可用字段，一个快速的解决方案是使用%+v格式说明符打印出config变量：

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

更多详细信息，请参考参考文档。

英文:

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

  1. package main
  3. import (
  4. 	&quot;flag&quot;
  5. 	&quot;fmt&quot;
  6. 	&quot;path/filepath&quot;
  8. 	&quot;k8s.io/client-go/kubernetes&quot;
  9. 	&quot;k8s.io/client-go/tools/clientcmd&quot;
  10. 	&quot;k8s.io/client-go/util/homedir&quot;
  11. )
  13. func main() {
  14. 	var kubeconfig *string
  16. 	if home := homedir.HomeDir(); home != &quot;&quot; {
  17. 		kubeconfig = flag.String(&quot;kubeconfig&quot;, filepath.Join(home, &quot;.kube&quot;, &quot;config&quot;), &quot;(optional) absolute path to the kubeconfig file&quot;)
  18. 	} else {
  19. 		kubeconfig = flag.String(&quot;kubeconfig&quot;, &quot;&quot;, &quot;absolute path to the kubeconfig file&quot;)
  20. 	}
  22. 	flag.Parse()
  24. 	config, err := clientcmd.BuildConfigFromFlags(&quot;&quot;, *kubeconfig)
  25. 	if err != nil {
  26. 		panic(err)
  27. 	}
  29. 	fmt.Printf(&quot;server: %s\n&quot;, config.Host)
  30. }

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:

  1. fmt.Printf(&quot;%+v\n&quot;, config)

For more details, look at the reference documentation.

huangapple
  • 本文由 发表于 2022年10月26日 03:15:35
  • 转载请务必保留本文链接：https://go.coder-hub.com/74199122.html
  • go
  • kubernetes
  • kubernetes-go-client
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