k8s.go

import (
	"k8s.io/client-go/1.4/kubernetes"
	"k8s.io/client-go/1.4/pkg/api"
	"k8s.io/client-go/1.4/pkg/labels"
	"k8s.io/client-go/1.4/pkg/apis/extensions/v1beta1"
	"k8s.io/client-go/1.4/tools/clientcmd"
)

var (
	kubeconfig = flag.String("kubeconfig", os.Getenv("HOME")+"/.kube/config", "absolute path to the kubeconfig file")
)

func main() {
	flag.Parse()

	var appName = "myapp"

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

	m := map[string]string{
		"app": appName,
	}

	dpls, err := clientset.Extensions().Deployments("").List(
		api.ListOptions{
			LabelSelector: labels.SelectorFromSet(m),
		})
	check(err)

	fmt.Printf("There are %d deployments in the cluster\n", len(dpls.Items))
}