ceph-csi/vendor/k8s.io/kubernetes/cmd/cloud-controller-manager/app/controllermanager.go

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/*
Copyright 2016 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package app
import (
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"fmt"
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"math/rand"
"net"
"os"
"strings"
"time"
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"github.com/golang/glog"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/util/uuid"
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"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/informers"
"k8s.io/client-go/kubernetes"
restclient "k8s.io/client-go/rest"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
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cloudcontrollerconfig "k8s.io/kubernetes/cmd/cloud-controller-manager/app/config"
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"k8s.io/kubernetes/cmd/cloud-controller-manager/app/options"
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genericcontrollermanager "k8s.io/kubernetes/cmd/controller-manager/app"
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"k8s.io/kubernetes/pkg/cloudprovider"
"k8s.io/kubernetes/pkg/controller"
cloudcontrollers "k8s.io/kubernetes/pkg/controller/cloud"
routecontroller "k8s.io/kubernetes/pkg/controller/route"
servicecontroller "k8s.io/kubernetes/pkg/controller/service"
"k8s.io/kubernetes/pkg/util/configz"
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utilflag "k8s.io/kubernetes/pkg/util/flag"
"k8s.io/kubernetes/pkg/version/verflag"
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)
const (
// ControllerStartJitter is the jitter value used when starting controller managers.
ControllerStartJitter = 1.0
)
// NewCloudControllerManagerCommand creates a *cobra.Command object with default parameters
func NewCloudControllerManagerCommand() *cobra.Command {
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s, err := options.NewCloudControllerManagerOptions()
if err != nil {
glog.Fatalf("unable to initialize command options: %v", err)
}
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cmd := &cobra.Command{
Use: "cloud-controller-manager",
Long: `The Cloud controller manager is a daemon that embeds
the cloud specific control loops shipped with Kubernetes.`,
Run: func(cmd *cobra.Command, args []string) {
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verflag.PrintAndExitIfRequested()
utilflag.PrintFlags(cmd.Flags())
c, err := s.Config()
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
if err := Run(c.Complete()); err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
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},
}
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s.AddFlags(cmd.Flags())
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return cmd
}
// resyncPeriod computes the time interval a shared informer waits before resyncing with the api server
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func resyncPeriod(c *cloudcontrollerconfig.CompletedConfig) func() time.Duration {
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return func() time.Duration {
factor := rand.Float64() + 1
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return time.Duration(float64(c.ComponentConfig.GenericComponent.MinResyncPeriod.Nanoseconds()) * factor)
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}
}
// Run runs the ExternalCMServer. This should never exit.
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func Run(c *cloudcontrollerconfig.CompletedConfig) error {
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cloud, err := cloudprovider.InitCloudProvider(c.ComponentConfig.CloudProvider.Name, c.ComponentConfig.CloudProvider.CloudConfigFile)
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if err != nil {
glog.Fatalf("Cloud provider could not be initialized: %v", err)
}
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if cloud == nil {
glog.Fatalf("cloud provider is nil")
}
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if cloud.HasClusterID() == false {
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if c.ComponentConfig.KubeCloudShared.AllowUntaggedCloud == true {
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glog.Warning("detected a cluster without a ClusterID. A ClusterID will be required in the future. Please tag your cluster to avoid any future issues")
} else {
glog.Fatalf("no ClusterID found. A ClusterID is required for the cloud provider to function properly. This check can be bypassed by setting the allow-untagged-cloud option")
}
}
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// setup /configz endpoint
if cz, err := configz.New("componentconfig"); err == nil {
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cz.Set(c.ComponentConfig)
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} else {
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glog.Errorf("unable to register configz: %c", err)
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}
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// Start the controller manager HTTP server
stopCh := make(chan struct{})
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if c.SecureServing != nil {
handler := genericcontrollermanager.NewBaseHandler(&c.ComponentConfig.Debugging)
handler = genericcontrollermanager.BuildHandlerChain(handler, &c.Authorization, &c.Authentication)
if err := c.SecureServing.Serve(handler, 0, stopCh); err != nil {
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return err
}
}
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if c.InsecureServing != nil {
handler := genericcontrollermanager.NewBaseHandler(&c.ComponentConfig.Debugging)
handler = genericcontrollermanager.BuildHandlerChain(handler, &c.Authorization, &c.Authentication)
if err := c.InsecureServing.Serve(handler, 0, stopCh); err != nil {
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return err
}
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}
run := func(stop <-chan struct{}) {
rootClientBuilder := controller.SimpleControllerClientBuilder{
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ClientConfig: c.Kubeconfig,
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}
var clientBuilder controller.ControllerClientBuilder
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if c.ComponentConfig.KubeCloudShared.UseServiceAccountCredentials {
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clientBuilder = controller.SAControllerClientBuilder{
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ClientConfig: restclient.AnonymousClientConfig(c.Kubeconfig),
CoreClient: c.Client.CoreV1(),
AuthenticationClient: c.Client.AuthenticationV1(),
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Namespace: "kube-system",
}
} else {
clientBuilder = rootClientBuilder
}
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if err := startControllers(c, rootClientBuilder, clientBuilder, stop, cloud); err != nil {
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glog.Fatalf("error running controllers: %v", err)
}
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}
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if !c.ComponentConfig.GenericComponent.LeaderElection.LeaderElect {
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run(nil)
panic("unreachable")
}
// Identity used to distinguish between multiple cloud controller manager instances
id, err := os.Hostname()
if err != nil {
return err
}
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// add a uniquifier so that two processes on the same host don't accidentally both become active
id = id + "_" + string(uuid.NewUUID())
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// Lock required for leader election
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rl, err := resourcelock.New(c.ComponentConfig.GenericComponent.LeaderElection.ResourceLock,
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"kube-system",
"cloud-controller-manager",
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c.LeaderElectionClient.CoreV1(),
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resourcelock.ResourceLockConfig{
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Identity: id,
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EventRecorder: c.EventRecorder,
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})
if err != nil {
glog.Fatalf("error creating lock: %v", err)
}
// Try and become the leader and start cloud controller manager loops
leaderelection.RunOrDie(leaderelection.LeaderElectionConfig{
Lock: rl,
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LeaseDuration: c.ComponentConfig.GenericComponent.LeaderElection.LeaseDuration.Duration,
RenewDeadline: c.ComponentConfig.GenericComponent.LeaderElection.RenewDeadline.Duration,
RetryPeriod: c.ComponentConfig.GenericComponent.LeaderElection.RetryPeriod.Duration,
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Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: run,
OnStoppedLeading: func() {
glog.Fatalf("leaderelection lost")
},
},
})
panic("unreachable")
}
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// startControllers starts the cloud specific controller loops.
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func startControllers(c *cloudcontrollerconfig.CompletedConfig, rootClientBuilder, clientBuilder controller.ControllerClientBuilder, stop <-chan struct{}, cloud cloudprovider.Interface) error {
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// Function to build the kube client object
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client := func(serviceAccountName string) kubernetes.Interface {
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return clientBuilder.ClientOrDie(serviceAccountName)
}
if cloud != nil {
// Initialize the cloud provider with a reference to the clientBuilder
cloud.Initialize(clientBuilder)
}
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// TODO: move this setup into Config
versionedClient := rootClientBuilder.ClientOrDie("shared-informers")
sharedInformers := informers.NewSharedInformerFactory(versionedClient, resyncPeriod(c)())
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// Start the CloudNodeController
nodeController := cloudcontrollers.NewCloudNodeController(
sharedInformers.Core().V1().Nodes(),
client("cloud-node-controller"), cloud,
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c.ComponentConfig.KubeCloudShared.NodeMonitorPeriod.Duration,
c.ComponentConfig.NodeStatusUpdateFrequency.Duration)
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nodeController.Run(stop)
time.Sleep(wait.Jitter(c.ComponentConfig.GenericComponent.ControllerStartInterval.Duration, ControllerStartJitter))
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// Start the PersistentVolumeLabelController
pvlController := cloudcontrollers.NewPersistentVolumeLabelController(client("pvl-controller"), cloud)
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go pvlController.Run(5, stop)
time.Sleep(wait.Jitter(c.ComponentConfig.GenericComponent.ControllerStartInterval.Duration, ControllerStartJitter))
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// Start the service controller
serviceController, err := servicecontroller.New(
cloud,
client("service-controller"),
sharedInformers.Core().V1().Services(),
sharedInformers.Core().V1().Nodes(),
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c.ComponentConfig.KubeCloudShared.ClusterName,
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)
if err != nil {
glog.Errorf("Failed to start service controller: %v", err)
} else {
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go serviceController.Run(stop, int(c.ComponentConfig.ServiceController.ConcurrentServiceSyncs))
time.Sleep(wait.Jitter(c.ComponentConfig.GenericComponent.ControllerStartInterval.Duration, ControllerStartJitter))
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}
// If CIDRs should be allocated for pods and set on the CloudProvider, then start the route controller
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if c.ComponentConfig.KubeCloudShared.AllocateNodeCIDRs && c.ComponentConfig.KubeCloudShared.ConfigureCloudRoutes {
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if routes, ok := cloud.Routes(); !ok {
glog.Warning("configure-cloud-routes is set, but cloud provider does not support routes. Will not configure cloud provider routes.")
} else {
var clusterCIDR *net.IPNet
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if len(strings.TrimSpace(c.ComponentConfig.KubeCloudShared.ClusterCIDR)) != 0 {
_, clusterCIDR, err = net.ParseCIDR(c.ComponentConfig.KubeCloudShared.ClusterCIDR)
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if err != nil {
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glog.Warningf("Unsuccessful parsing of cluster CIDR %v: %v", c.ComponentConfig.KubeCloudShared.ClusterCIDR, err)
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}
}
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routeController := routecontroller.New(routes, client("route-controller"), sharedInformers.Core().V1().Nodes(), c.ComponentConfig.KubeCloudShared.ClusterName, clusterCIDR)
go routeController.Run(stop, c.ComponentConfig.KubeCloudShared.RouteReconciliationPeriod.Duration)
time.Sleep(wait.Jitter(c.ComponentConfig.GenericComponent.ControllerStartInterval.Duration, ControllerStartJitter))
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}
} else {
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glog.Infof("Will not configure cloud provider routes for allocate-node-cidrs: %v, configure-cloud-routes: %v.", c.ComponentConfig.KubeCloudShared.AllocateNodeCIDRs, c.ComponentConfig.KubeCloudShared.ConfigureCloudRoutes)
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}
// If apiserver is not running we should wait for some time and fail only then. This is particularly
// important when we start apiserver and controller manager at the same time.
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err = genericcontrollermanager.WaitForAPIServer(versionedClient, 10*time.Second)
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if err != nil {
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glog.Fatalf("Failed to wait for apiserver being healthy: %v", err)
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}
sharedInformers.Start(stop)
select {}
}