Ch01 Client

Yang Haoran 7/19/2023 K8s operatorGo

# RestClient

k8s中所有的资源在go中都实现了runtime.object

package main

import (
	"context"
	v1 "k8s.io/api/core/v1"
	"k8s.io/client-go/kubernetes/scheme"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
)

func main() {
	//config, 用来连接k8s
	//master url指定为空的话，会从kubeconfig里获取
	config, err := clientcmd.BuildConfigFromFlags("", "C:\\Users\\YHR\\.kube\\config")
	if err != nil {
		panic(err)
	}
	config.GroupVersion = &v1.SchemeGroupVersion
	config.NegotiatedSerializer = scheme.Codecs
	config.APIPath = "/api"

	//client
	restClient, err := rest.RESTClientFor(config)
	if err != nil {
		panic(err)
	}

	//get data
	//拼接http请求的url，获取集群里的pod
	pod := v1.Pod{}
	err = restClient.Get().Namespace("kubernetes-dashboard").Resource("pods").Name("dashboard-metrics-scraper-6ccbc78cd8-5xx8f").Do(context.TODO()).Into(&pod)

	if err != nil {
		println(err)
	} else {
		println(pod.Name)
	}

}

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# ClientSet

go mod tidy

//client Set
	config, err := clientcmd.BuildConfigFromFlags("", "C:\\Users\\YHR\\.kube\\config")
	if err != nil {
		panic(err)
	}
	clientset, err := kubernetes.NewForConfig(config)
	if err != nil {
		panic(err)
	}
	coreV1 := clientset.CoreV1()
	pod, err := coreV1.Pods("kubernetes-dashboard").Get(context.TODO(), "dashboard-metrics-scraper-6ccbc78cd8-5xx8f", v1.GetOptions{})
	if err != nil {
		println(err)
	} else {
		println(pod.Name)
	}