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11c69ac127
Adding instructions for out-of-cluster example and making it work without specifying the -kubeconfig argument if the home directory can be inferred. This is part of the body of work improving the client library samples. Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com> Kubernetes-commit: e59f05fe0ee6980c4bdaae76f5a77ef884bd2da1
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Note: the example only works with the code within the same release/branch.
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package main
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import (
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"flag"
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"fmt"
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"os"
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"path/filepath"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/clientcmd"
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// Uncomment the following line to load the gcp plugin (only required to authenticate against GKE clusters).
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// _ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
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)
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func main() {
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var kubeconfig *string
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if home := homeDir(); home != "" {
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kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
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} else {
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kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
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}
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flag.Parse()
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// use the current context in kubeconfig
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config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
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if err != nil {
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panic(err.Error())
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}
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// create the clientset
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clientset, err := kubernetes.NewForConfig(config)
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if err != nil {
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panic(err.Error())
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}
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for {
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pods, err := clientset.CoreV1().Pods("").List(metav1.ListOptions{})
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if err != nil {
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panic(err.Error())
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}
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fmt.Printf("There are %d pods in the cluster\n", len(pods.Items))
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time.Sleep(10 * time.Second)
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}
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}
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func homeDir() string {
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if h := os.Getenv("HOME"); h != "" {
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return h
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}
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return os.Getenv("USERPROFILE") // windows
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}
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