0d7a6eb058
This adds a new stand-alone certificates controller for use on GKE. It allows calling GKE to sign certificates instead of requiring the CA private key locally. It does not aim for 100% feature parity with kube-controller-manager yet, so for instance, leader election support is omitted.
91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
/*
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Copyright 2017 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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// Package app implements a server that runs a stand-alone version of the
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// certificates controller for GKE clusters.
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package app
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import (
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"time"
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v1core "k8s.io/client-go/kubernetes/typed/core/v1"
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restclient "k8s.io/client-go/rest"
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"k8s.io/client-go/tools/clientcmd"
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"k8s.io/client-go/tools/record"
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"k8s.io/kubernetes/pkg/client/clientset_generated/clientset"
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informers "k8s.io/kubernetes/pkg/client/informers/informers_generated/externalversions"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/controller/certificates"
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// Install all auth plugins
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_ "k8s.io/client-go/plugin/pkg/client/auth"
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"github.com/golang/glog"
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"github.com/spf13/cobra"
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)
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// NewGKECertificatesControllerCommand creates a new *cobra.Command with default parameters.
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func NewGKECertificatesControllerCommand() *cobra.Command {
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cmd := &cobra.Command{
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Use: "gke-certificates-controller",
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Long: `The Kubernetes GKE certificates controller is a daemon that
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handles auto-approving and signing certificates for GKE clusters.`,
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}
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return cmd
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}
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// Run runs the GKECertificatesController. This should never exit.
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func Run(s *GKECertificatesController) error {
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kubeconfig, err := clientcmd.BuildConfigFromFlags("", s.Kubeconfig)
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if err != nil {
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return err
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}
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kubeClient, err := clientset.NewForConfig(restclient.AddUserAgent(kubeconfig, "gke-certificates-controller"))
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if err != nil {
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return err
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}
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eventBroadcaster := record.NewBroadcaster()
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eventBroadcaster.StartLogging(glog.Infof)
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eventBroadcaster.StartRecordingToSink(&v1core.EventSinkImpl{Interface: v1core.New(kubeClient.Core().RESTClient()).Events("")})
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clientBuilder := controller.SimpleControllerClientBuilder{ClientConfig: kubeconfig}
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client := clientBuilder.ClientOrDie("certificate-controller")
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sharedInformers := informers.NewSharedInformerFactory(client, time.Duration(12)*time.Hour)
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signer, err := NewGKESigner(s.ClusterSigningGKEKubeconfig, s.ClusterSigningGKERetryBackoff.Duration)
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if err != nil {
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return err
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}
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controller, err := certificates.NewCertificateController(
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client,
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sharedInformers.Certificates().V1beta1().CertificateSigningRequests(),
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signer,
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certificates.NewGroupApprover(s.ApproveAllKubeletCSRsForGroup),
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)
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if err != nil {
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return err
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}
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sharedInformers.Start(nil)
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controller.Run(1, nil) // runs forever
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return nil
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}
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