k8s.io/client-go@v0.31.1/examples/out-of-cluster-client-configuration/main.go (about) 1 /* 2 Copyright 2016 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 // Note: the example only works with the code within the same release/branch. 18 package main 19 20 import ( 21 "context" 22 "flag" 23 "fmt" 24 "path/filepath" 25 "time" 26 27 "k8s.io/apimachinery/pkg/api/errors" 28 metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" 29 "k8s.io/client-go/kubernetes" 30 "k8s.io/client-go/tools/clientcmd" 31 "k8s.io/client-go/util/homedir" 32 // 33 // Uncomment to load all auth plugins 34 // _ "k8s.io/client-go/plugin/pkg/client/auth" 35 // 36 // Or uncomment to load specific auth plugins 37 // _ "k8s.io/client-go/plugin/pkg/client/auth/azure" 38 // _ "k8s.io/client-go/plugin/pkg/client/auth/gcp" 39 // _ "k8s.io/client-go/plugin/pkg/client/auth/oidc" 40 ) 41 42 func main() { 43 var kubeconfig *string 44 if home := homedir.HomeDir(); home != "" { 45 kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file") 46 } else { 47 kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file") 48 } 49 flag.Parse() 50 51 // use the current context in kubeconfig 52 config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig) 53 if err != nil { 54 panic(err.Error()) 55 } 56 57 // create the clientset 58 clientset, err := kubernetes.NewForConfig(config) 59 if err != nil { 60 panic(err.Error()) 61 } 62 for { 63 pods, err := clientset.CoreV1().Pods("").List(context.TODO(), metav1.ListOptions{}) 64 if err != nil { 65 panic(err.Error()) 66 } 67 fmt.Printf("There are %d pods in the cluster\n", len(pods.Items)) 68 69 // Examples for error handling: 70 // - Use helper functions like e.g. errors.IsNotFound() 71 // - And/or cast to StatusError and use its properties like e.g. ErrStatus.Message 72 namespace := "default" 73 pod := "example-xxxxx" 74 _, err = clientset.CoreV1().Pods(namespace).Get(context.TODO(), pod, metav1.GetOptions{}) 75 if errors.IsNotFound(err) { 76 fmt.Printf("Pod %s in namespace %s not found\n", pod, namespace) 77 } else if statusError, isStatus := err.(*errors.StatusError); isStatus { 78 fmt.Printf("Error getting pod %s in namespace %s: %v\n", 79 pod, namespace, statusError.ErrStatus.Message) 80 } else if err != nil { 81 panic(err.Error()) 82 } else { 83 fmt.Printf("Found pod %s in namespace %s\n", pod, namespace) 84 } 85 86 time.Sleep(10 * time.Second) 87 } 88 }