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Update go example to the latest version to keep in sync with client-go example. #16536

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Oct 14, 2019
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Update go example to the latest version to keep in sync with client-go example. #16536

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38 changes: 23 additions & 15 deletions content/en/docs/tasks/administer-cluster/access-cluster-api.md
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Expand Up @@ -161,28 +161,36 @@ Kubernetes officially supports client libraries for [Go](#go-client) and

#### Go client

* To get the library, run the following command: `go get k8s.io/client-go/<version number>/kubernetes` See [https://github.com/kubernetes/client-go](https://github.com/kubernetes/client-go) to see which versions are supported.
* Write an application atop of the client-go clients. Note that client-go defines its own API objects, so if needed, please import API definitions from client-go rather than from the main repository, e.g., `import "k8s.io/client-go/1.4/pkg/api/v1"` is correct.
* To get the library, run the following command: `go get k8s.io/client-go@kubernetes-<kubernetes-version-number>` See [https://github.com/kubernetes/client-go/releases](https://github.com/kubernetes/client-go/releases) to see which versions are supported.
* Write an application atop of the client-go clients.

{{< note >}}

client-go defines its own API objects, so if needed, import API definitions from client-go rather than from the main repository. For example, `import "k8s.io/client-go/kubernetes"` is correct.

{{< /note >}}

The Go client can use the same [kubeconfig file](/docs/concepts/cluster-administration/authenticate-across-clusters-kubeconfig/)
as the kubectl CLI does to locate and authenticate to the API server. See this [example](https://git.k8s.io/client-go/examples/out-of-cluster-client-configuration/main.go):

```golang
import (
"fmt"
"k8s.io/client-go/1.4/kubernetes"
"k8s.io/client-go/1.4/pkg/api/v1"
"k8s.io/client-go/1.4/tools/clientcmd"
"fmt"
"k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
...
// uses the current context in kubeconfig
config, _ := clientcmd.BuildConfigFromFlags("", "path to kubeconfig")
// creates the clientset
clientset, _:= kubernetes.NewForConfig(config)
// access the API to list pods
pods, _:= clientset.CoreV1().Pods("").List(v1.ListOptions{})
fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
...

func main() {
// uses the current context in kubeconfig
// path-to-kubeconfig -- for example, /root/.kube/config
config, _ := clientcmd.BuildConfigFromFlags("", "<path-to-kubeconfig>")
// creates the clientset
clientset, _ := kubernetes.NewForConfig(config)
// access the API to list pods
pods, _ := clientset.CoreV1().Pods("").List(v1.ListOptions{})
fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
}
```

If the application is deployed as a Pod in the cluster, please refer to the [next section](#accessing-the-api-from-a-pod).
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