Stackoverflow: 73548332

main.go

ctx := context.Background()
containerService, _ := container.NewService(ctx)

name := fmt.Sprintf("projects/%s/locations/%s/clusters/%s", clusterProject, clusterLocation, clusterName)
rqst := containerService.Projects.Locations.Clusters.Get(name)
resp, _ := rqst.Do()

cert, _ := base64.StdEncoding.DecodeString(resp.MasterAuth.ClusterCaCertificate)

// Create Config for Cluster
// Equivalent to ~/.kubeconfig
// apiVersion: v1
// kind: Config
// clusters:
// - name: gke_{project}_{location}_{cluster}
//   cluster:
// 	   certificate-authority-data: DATA+OMITTED
// 	   server: https://...
// contexts:
// - name: gke_{project}_{location}_{cluster}
//   context:
// 	   cluster: gke_{project}_{location}_{cluster}
// 	   user: gke_{project}_{location}_{cluster}
// users:
// - name: gke_{project}_{location}_{cluster}
//   user:
// 	   auth-provider:
// 	     name: gcp
// 	     config:
// 		   scopes:

server := fmt.Sprintf("https://%s", resp.Endpoint)

apiConfig := api.Config{
	APIVersion: "v1",
	Kind:       "Config",
	Clusters: map[string]*api.Cluster{
		clusterName: {
			CertificateAuthorityData: cert,
			Server:                   server,
		},
	},
	Contexts: map[string]*api.Context{
		clusterName: {
			Cluster:  clusterName,
			AuthInfo: clusterName,
		},
	},
	AuthInfos: map[string]*api.AuthInfo{
		clusterName: {
			AuthProvider: &api.AuthProviderConfig{
				Name: "gcp",
				Config: map[string]string{
					"scopes": "https://www.googleapis.com/auth/cloud-platform",
				},
			},
		},
	},
}
return apiConfig, nil