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main.go
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main.go
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// Copyright 2020-2021 Clastix Labs
// SPDX-License-Identifier: Apache-2.0
package main
import (
goflag "flag"
"fmt"
"os"
goRuntime "runtime"
flag "github.com/spf13/pflag"
"go.uber.org/zap/zapcore"
corev1 "k8s.io/api/core/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
utilVersion "k8s.io/apimachinery/pkg/util/version"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
"k8s.io/client-go/rest"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/healthz"
"sigs.k8s.io/controller-runtime/pkg/log/zap"
capsulev1alpha1 "github.com/clastix/capsule/api/v1alpha1"
capsulev1beta1 "github.com/clastix/capsule/api/v1beta1"
capsulev1beta2 "github.com/clastix/capsule/api/v1beta2"
configcontroller "github.com/clastix/capsule/controllers/config"
"github.com/clastix/capsule/controllers/pv"
rbaccontroller "github.com/clastix/capsule/controllers/rbac"
"github.com/clastix/capsule/controllers/resources"
servicelabelscontroller "github.com/clastix/capsule/controllers/servicelabels"
tenantcontroller "github.com/clastix/capsule/controllers/tenant"
tlscontroller "github.com/clastix/capsule/controllers/tls"
"github.com/clastix/capsule/pkg/configuration"
"github.com/clastix/capsule/pkg/indexer"
"github.com/clastix/capsule/pkg/webhook"
"github.com/clastix/capsule/pkg/webhook/defaults"
"github.com/clastix/capsule/pkg/webhook/ingress"
namespacewebhook "github.com/clastix/capsule/pkg/webhook/namespace"
"github.com/clastix/capsule/pkg/webhook/networkpolicy"
"github.com/clastix/capsule/pkg/webhook/node"
"github.com/clastix/capsule/pkg/webhook/ownerreference"
"github.com/clastix/capsule/pkg/webhook/pod"
"github.com/clastix/capsule/pkg/webhook/pvc"
"github.com/clastix/capsule/pkg/webhook/route"
"github.com/clastix/capsule/pkg/webhook/service"
"github.com/clastix/capsule/pkg/webhook/tenant"
"github.com/clastix/capsule/pkg/webhook/utils"
)
var (
scheme = runtime.NewScheme()
setupLog = ctrl.Log.WithName("setup")
)
func init() {
utilruntime.Must(clientgoscheme.AddToScheme(scheme))
utilruntime.Must(capsulev1alpha1.AddToScheme(scheme))
utilruntime.Must(capsulev1beta1.AddToScheme(scheme))
utilruntime.Must(capsulev1beta2.AddToScheme(scheme))
utilruntime.Must(apiextensionsv1.AddToScheme(scheme))
}
func printVersion() {
setupLog.Info(fmt.Sprintf("Capsule Version %s %s%s", GitTag, GitCommit, GitDirty))
setupLog.Info(fmt.Sprintf("Build from: %s", GitRepo))
setupLog.Info(fmt.Sprintf("Build date: %s", BuildTime))
setupLog.Info(fmt.Sprintf("Go Version: %s", goRuntime.Version()))
setupLog.Info(fmt.Sprintf("Go OS/Arch: %s/%s", goRuntime.GOOS, goRuntime.GOARCH))
}
func newDelegatingClient(cache cache.Cache, config *rest.Config, options client.Options, uncachedObjects ...client.Object) (client.Client, error) {
cl, err := client.New(config, options)
if err != nil {
return nil, err
}
delegatingClient, err := client.NewDelegatingClient(
client.NewDelegatingClientInput{
Client: cl,
CacheReader: cache,
UncachedObjects: uncachedObjects,
CacheUnstructured: true,
},
)
if err != nil {
return nil, err
}
return delegatingClient, nil
}
// nolint:maintidx,cyclop
func main() {
var enableLeaderElection, version bool
var metricsAddr, namespace, configurationName string
var goFlagSet goflag.FlagSet
flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
"Enable leader election for controller manager. "+
"Enabling this will ensure there is only one active controller manager.")
flag.BoolVar(&version, "version", false, "Print the Capsule version and exit")
flag.StringVar(&configurationName, "configuration-name", "default", "The CapsuleConfiguration resource name to use")
opts := zap.Options{
EncoderConfigOptions: append([]zap.EncoderConfigOption{}, func(config *zapcore.EncoderConfig) {
config.EncodeTime = zapcore.ISO8601TimeEncoder
}),
}
opts.BindFlags(&goFlagSet)
flag.CommandLine.AddGoFlagSet(&goFlagSet)
flag.Parse()
ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
printVersion()
if version {
os.Exit(0)
}
if namespace = os.Getenv("NAMESPACE"); len(namespace) == 0 {
setupLog.Error(fmt.Errorf("unable to determinate the Namespace Capsule is running on"), "unable to start manager")
os.Exit(1)
}
if len(configurationName) == 0 {
setupLog.Error(fmt.Errorf("missing CapsuleConfiguration resource name"), "unable to start manager")
os.Exit(1)
}
manager, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
Scheme: scheme,
MetricsBindAddress: metricsAddr,
Port: 9443,
LeaderElection: enableLeaderElection,
LeaderElectionID: "42c733ea.clastix.capsule.io",
HealthProbeBindAddress: ":10080",
NewClient: newDelegatingClient,
})
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
_ = manager.AddReadyzCheck("ping", healthz.Ping)
_ = manager.AddHealthzCheck("ping", healthz.Ping)
ctx := ctrl.SetupSignalHandler()
cfg := configuration.NewCapsuleConfiguration(ctx, manager.GetClient(), configurationName)
directClient, err := client.New(ctrl.GetConfigOrDie(), client.Options{
Scheme: manager.GetScheme(),
Mapper: manager.GetRESTMapper(),
})
if err != nil {
setupLog.Error(err, "unable to create the direct client")
os.Exit(1)
}
directCfg := configuration.NewCapsuleConfiguration(ctx, directClient, configurationName)
if directCfg.EnableTLSConfiguration() {
tlsReconciler := &tlscontroller.Reconciler{
Client: directClient,
Log: ctrl.Log.WithName("controllers").WithName("TLS"),
Namespace: namespace,
Configuration: directCfg,
}
if err = tlsReconciler.SetupWithManager(manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "Namespace")
os.Exit(1)
}
tlsCert := &corev1.Secret{}
if err = directClient.Get(ctx, types.NamespacedName{Namespace: namespace, Name: directCfg.TLSSecretName()}, tlsCert); err != nil {
setupLog.Error(err, "unable to get Capsule TLS secret")
os.Exit(1)
}
// Reconcile TLS certificates before starting controllers and webhooks
if err = tlsReconciler.ReconcileCertificates(ctx, tlsCert); err != nil {
setupLog.Error(err, "unable to reconcile Capsule TLS secret")
os.Exit(1)
}
}
if err = (&tenantcontroller.Manager{
RESTConfig: manager.GetConfig(),
Client: manager.GetClient(),
Log: ctrl.Log.WithName("controllers").WithName("Tenant"),
Recorder: manager.GetEventRecorderFor("tenant-controller"),
}).SetupWithManager(manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "Tenant")
os.Exit(1)
}
if err = (&capsulev1alpha1.Tenant{}).SetupWebhookWithManager(manager); err != nil {
setupLog.Error(err, "unable to create conversion webhook", "webhook", "capsulev1alpha1.Tenant")
os.Exit(1)
}
if err = (&capsulev1alpha1.CapsuleConfiguration{}).SetupWebhookWithManager(manager); err != nil {
setupLog.Error(err, "unable to create conversion webhook", "webhook", "capsulev1alpha1.CapsuleConfiguration")
os.Exit(1)
}
if err = (&capsulev1beta1.Tenant{}).SetupWebhookWithManager(manager); err != nil {
setupLog.Error(err, "unable to create conversion webhook", "webhook", "capsulev1beta1.Tenant")
os.Exit(1)
}
if err = indexer.AddToManager(ctx, setupLog, manager); err != nil {
setupLog.Error(err, "unable to setup indexers")
os.Exit(1)
}
var kubeVersion *utilVersion.Version
if kubeVersion, err = utils.GetK8sVersion(); err != nil {
setupLog.Error(err, "unable to get kubernetes version")
os.Exit(1)
}
// webhooks: the order matters, don't change it and just append
webhooksList := append(
make([]webhook.Webhook, 0),
route.Pod(pod.ImagePullPolicy(), pod.ContainerRegistry(), pod.PriorityClass(), pod.RuntimeClass()),
route.Namespace(utils.InCapsuleGroups(cfg, namespacewebhook.PatchHandler(), namespacewebhook.QuotaHandler(), namespacewebhook.FreezeHandler(cfg), namespacewebhook.PrefixHandler(cfg), namespacewebhook.UserMetadataHandler())),
route.Ingress(ingress.Class(cfg, kubeVersion), ingress.Hostnames(cfg), ingress.Collision(cfg), ingress.Wildcard()),
route.PVC(pvc.Validating(), pvc.PersistentVolumeReuse()),
route.Service(service.Handler()),
route.NetworkPolicy(utils.InCapsuleGroups(cfg, networkpolicy.Handler())),
route.Tenant(tenant.NameHandler(), tenant.RoleBindingRegexHandler(), tenant.IngressClassRegexHandler(), tenant.StorageClassRegexHandler(), tenant.ContainerRegistryRegexHandler(), tenant.HostnameRegexHandler(), tenant.FreezedEmitter(), tenant.ServiceAccountNameHandler(), tenant.ForbiddenAnnotationsRegexHandler(), tenant.ProtectedHandler()),
route.OwnerReference(utils.InCapsuleGroups(cfg, namespacewebhook.OwnerReferenceHandler(), ownerreference.Handler(cfg))),
route.Cordoning(tenant.CordoningHandler(cfg), tenant.ResourceCounterHandler()),
route.Node(utils.InCapsuleGroups(cfg, node.UserMetadataHandler(cfg, kubeVersion))),
route.Defaults(defaults.Handler(cfg, kubeVersion)),
)
nodeWebhookSupported, _ := utils.NodeWebhookSupported(kubeVersion)
if !nodeWebhookSupported {
setupLog.Info("Disabling node labels verification webhook as current Kubernetes version doesn't have fix for CVE-2021-25735")
}
if err = webhook.Register(manager, webhooksList...); err != nil {
setupLog.Error(err, "unable to setup webhooks")
os.Exit(1)
}
rbacManager := &rbaccontroller.Manager{
Log: ctrl.Log.WithName("controllers").WithName("Rbac"),
Configuration: cfg,
}
if err = manager.Add(rbacManager); err != nil {
setupLog.Error(err, "unable to create cluster roles")
os.Exit(1)
}
if err = rbacManager.SetupWithManager(ctx, manager, configurationName); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "Rbac")
os.Exit(1)
}
if err = (&servicelabelscontroller.ServicesLabelsReconciler{
Log: ctrl.Log.WithName("controllers").WithName("ServiceLabels"),
}).SetupWithManager(ctx, manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "ServiceLabels")
os.Exit(1)
}
if err = (&servicelabelscontroller.EndpointsLabelsReconciler{
Log: ctrl.Log.WithName("controllers").WithName("EndpointLabels"),
}).SetupWithManager(ctx, manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "EndpointLabels")
os.Exit(1)
}
if err = (&servicelabelscontroller.EndpointSlicesLabelsReconciler{
Log: ctrl.Log.WithName("controllers").WithName("EndpointSliceLabels"),
VersionMinor: kubeVersion.Minor(),
VersionMajor: kubeVersion.Major(),
}).SetupWithManager(ctx, manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "EndpointSliceLabels")
}
if err = (&pv.Controller{}).SetupWithManager(manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "PersistentVolume")
os.Exit(1)
}
if err = (&configcontroller.Manager{
Log: ctrl.Log.WithName("controllers").WithName("CapsuleConfiguration"),
}).SetupWithManager(manager, configurationName); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "CapsuleConfiguration")
os.Exit(1)
}
if err = (&resources.Global{}).SetupWithManager(manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "resources.Global")
os.Exit(1)
}
if err = (&resources.Namespaced{}).SetupWithManager(manager); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "resources.Namespaced")
os.Exit(1)
}
setupLog.Info("starting manager")
if err = manager.Start(ctx); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}