Consolidate the katib-cert-generator to the katib-controller

Signed-off-by: Yuki Iwai <yuki.iwai.tz@gmail.com>

.github/workflows/publish-core-images.yaml

@@ -26,8 +26,6 @@ jobs:
             dockerfile: cmd/db-manager/v1beta1/Dockerfile
           - component-name: katib-ui
             dockerfile: cmd/ui/v1beta1/Dockerfile
-          - component-name: cert-generator
-            dockerfile: cmd/cert-generator/v1beta1/Dockerfile
           - component-name: file-metrics-collector
             dockerfile: cmd/metricscollector/v1beta1/file-metricscollector/Dockerfile
           - component-name: tfevent-metrics-collector

README.md

@@ -179,7 +179,6 @@ Make sure that all Katib components are running:
 $ kubectl get pods -n kubeflow
 
 NAME                                READY   STATUS      RESTARTS   AGE
-katib-cert-generator-rw95w          0/1     Completed   0          35s
 katib-controller-566595bdd8-hbxgf   1/1     Running     0          36s
 katib-db-manager-57cd769cdb-4g99m   1/1     Running     0          36s
 katib-mysql-7894994f88-5d4s5        1/1     Running     0          36s

cmd/katib-controller/v1beta1/main.go

@@ -33,18 +33,23 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/log/zap"
 	"sigs.k8s.io/controller-runtime/pkg/manager"
 	"sigs.k8s.io/controller-runtime/pkg/manager/signals"
+	"sigs.k8s.io/controller-runtime/pkg/webhook"
 
 	configv1beta1 "github.com/kubeflow/katib/pkg/apis/config/v1beta1"
 	apis "github.com/kubeflow/katib/pkg/apis/controller"
+	cert "github.com/kubeflow/katib/pkg/cert-generator/v1beta1"
 	"github.com/kubeflow/katib/pkg/controller.v1beta1"
 	"github.com/kubeflow/katib/pkg/controller.v1beta1/consts"
 	"github.com/kubeflow/katib/pkg/util/v1beta1/katibconfig"
-	webhook "github.com/kubeflow/katib/pkg/webhook/v1beta1"
+	webhookv1beta1 "github.com/kubeflow/katib/pkg/webhook/v1beta1"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
 )
 
-var scheme = runtime.NewScheme()
+var (
+	scheme = runtime.NewScheme()
+	log    = logf.Log.WithName("entrypoint")
+)
 
 func init() {
 	utilruntime.Must(apis.AddToScheme(scheme))
@@ -54,15 +59,12 @@ func init() {
 
 func main() {
 	logf.SetLogger(zap.New())
-	log := logf.Log.WithName("entrypoint")
 
 	var katibConfigFile string
 	flag.StringVar(&katibConfigFile, "katib-config", "",
 		"The katib-controller will load its initial configuration from this file. "+
 			"Omit this flag to use the default configuration values. ")
 
-	// TODO (andreyvelich): Currently it is not possible to set different webhook service name.
-	// flag.StringVar(&serviceName, "webhook-service-name", "katib-controller", "The service name which will be used in webhook")
 	// TODO (andreyvelich): Currently is is not possible to store webhook cert in the local file system.
 	// flag.BoolVar(&certLocalFS, "cert-localfs", false, "Store the webhook cert in local file system")
 
@@ -127,36 +129,61 @@ func main() {
 		os.Exit(1)
 	}
 
-	log.Info("Registering Components.")
+	// Create a webhook server.
+	hookServer := webhook.NewServer(webhook.Options{
+		Port:    *initConfig.ControllerConfig.WebhookPort,
+		CertDir: consts.CertDir,
+	})
 
-	// Setup all Controllers
-	log.Info("Setting up controller.")
-	if err := controller.AddToManager(mgr); err != nil {
-		log.Error(err, "Unable to register controllers to the manager")
-		os.Exit(1)
-	}
+	ctx := signals.SetupSignalHandler()
+	certsReady := make(chan struct{})
 
-	log.Info("Setting up webhooks.")
-	if err := webhook.AddToManager(mgr, *initConfig.ControllerConfig.WebhookPort); err != nil {
-		log.Error(err, "Unable to register webhooks to the manager")
-		os.Exit(1)
+	if initConfig.CertGeneratorConfig.Enable {
+		if err = cert.AddToManager(mgr, initConfig.CertGeneratorConfig, certsReady); err != nil {
+			log.Error(err, "Failed to set up cert-generator")
+		}
+	} else {
+		close(certsReady)
 	}
 
+	// The setupControllers will register controllers to the manager
+	// after generated certs for the admission webhooks.
+	go setupControllers(mgr, certsReady, hookServer)
+
 	log.Info("Setting up health checker.")
-	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
-		log.Error(err, "Unable to add healthz endpoint to the manager")
-		os.Exit(1)
-	}
 	// TODO (@anencore94) need to more detailed check whether is it possible to communicate with k8s-apiserver or db-manager at '/readyz' ?
 	if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
 		log.Error(err, "Unable to add readyz endpoint to the manager")
 		os.Exit(1)
 	}
+	if err = mgr.AddHealthzCheck("healthz", hookServer.StartedChecker()); err != nil {
+		log.Error(err, "Add webhook server health checker to the manager failed")
+		os.Exit(1)
+	}
 
 	// Start the Cmd
-	log.Info("Starting the Cmd.")
-	if err := mgr.Start(signals.SetupSignalHandler()); err != nil {
+	log.Info("Starting the manager.")
+	if err = mgr.Start(ctx); err != nil {
 		log.Error(err, "Unable to run the manager")
 		os.Exit(1)
 	}
 }
+
+func setupControllers(mgr manager.Manager, certsReady chan struct{}, hookServer webhook.Server) {
+	// The certsReady blocks to register controllers until generated certs.
+	<-certsReady
+	log.Info("Certs ready")
+
+	// Setup all Controllers
+	log.Info("Setting up controller.")
+	if err := controller.AddToManager(mgr); err != nil {
+		log.Error(err, "Unable to register controllers to the manager")
+		os.Exit(1)
+	}
+
+	log.Info("Setting up webhooks.")
+	if err := webhookv1beta1.AddToManager(mgr, hookServer); err != nil {
+		log.Error(err, "Unable to register webhooks to the manager")
+		os.Exit(1)
+	}
+}

docs/developer-guide.md

@@ -100,23 +100,23 @@ plane CIDR source range to use the Katib webhooks
 
 ### Katib cert generator
 
-Katib uses the custom `cert-generator` [Kubernetes Job](https://kubernetes.io/docs/concepts/workloads/controllers/job/)
-to generate certificates for the webhooks.
+Katib Controller has the internal `cert-generator` to generate certificates for the webhooks.
 
-Once Katib is deployed in the Kubernetes cluster, the `cert-generator` Job follows these steps:
+Once Katib is deployed in the Kubernetes cluster, the `cert-generator` follows these steps:
 
 - Generate the self-signed certificate and private key.
 
 - Create a Kubernetes Secret with the self-signed TLS certificate and private key.
-  Secret has the `katib-webhook-cert` name and `cert-generator` Job's
+  Secret has the `katib-webhook-cert` name and `cert-generator` controller Deployment's
   `ownerReference` to clean-up resources once Katib is uninstalled.
 
-  Once Secret is created, the Katib controller Deployment spawns the Pod,
-  since the controller has the `katib-webhook-cert` Secret volume.
+- Save the self-signed TLS certificate and private key on local path (`/tmp/cert`).
 
 - Patch the webhooks with the `CABundle`.
 
-You can find the `cert-generator` source code [here](../cmd/cert-generator/v1beta1).
+Once the `cert-generator` finished, the Katib controller starts to register controllers such as `experiment-controller` to the manager.
+
+You can find the `cert-generator` source code [here](../pkg/cert-generator/v1beta1).
 
 ## Implement a new algorithm and use it in Katib
 

docs/images-location.md

@@ -64,17 +64,6 @@ The following table shows images for the
         <a href="https://github.com/docker-library/mysql/blob/c506174eab8ae160f56483e8d72410f8f1e1470f/8.0/Dockerfile.debian">Dockerfile</a>
       </td>
     </tr>
-    <tr align="center">
-      <td>
-        <code>docker.io/kubeflowkatib/cert-generator</code>
-      </td>
-      <td>
-        Katib Cert Generator
-      </td>
-      <td>
-        <a href="https://github.com/kubeflow/katib/blob/master/cmd/cert-generator/v1beta1/Dockerfile">Dockerfile</a>
-      </td>
-    </tr>
   </tbody>
 </table>
 

examples/v1beta1/argo/README.md

@@ -96,7 +96,6 @@ Check that Katib Controller's pod was restarted:
 $ kubectl get pods -n kubeflow
 
 NAME                                         READY   STATUS      RESTARTS   AGE
-katib-cert-generator-hnv6q                   0/1     Completed   0          6m12s
 katib-controller-784994d449-9bgj9            1/1     Running     0          28s
 katib-db-manager-78697c7bd4-ck7l8            1/1     Running     0          6m13s
 katib-mysql-854cdb87c4-krcm9                 1/1     Running     0          6m13s

examples/v1beta1/kind-cluster/README.md

@@ -27,7 +27,6 @@ If the above script was successful, Katib components will be running:
 $ kubectl get pods -n kubeflow
 
 NAME                                READY   STATUS      RESTARTS   AGE
-katib-cert-generator-tc2jt          0/1     Completed   0          67s
 katib-controller-566595bdd8-x7z6w   1/1     Running     0          67s
 katib-db-manager-57cd769cdb-x4lnz   1/1     Running     0          67s
 katib-mysql-7894994f88-7l8nd        1/1     Running     0          67s

examples/v1beta1/tekton/README.md

@@ -101,7 +101,6 @@ Check that Katib Controller's pod was restarted:
 $ kubectl get pods -n kubeflow
 
 NAME                                         READY   STATUS      RESTARTS   AGE
-katib-cert-generator-hnv6q                   0/1     Completed   0          6m12s
 katib-controller-784994d449-9bgj9            1/1     Running     0          28s
 katib-db-manager-78697c7bd4-ck7l8            1/1     Running     0          6m13s
 katib-mysql-854cdb87c4-krcm9                 1/1     Running     0          6m13s

go.mod

@@ -19,7 +19,6 @@ require (
 	github.com/onsi/gomega v1.27.7
 	github.com/prometheus/client_golang v1.15.1
 	github.com/shirou/gopsutil/v3 v3.22.5
-	github.com/spf13/cobra v1.6.0
 	github.com/spf13/viper v1.9.0
 	github.com/tidwall/gjson v1.14.1
 	golang.org/x/net v0.10.0
@@ -71,7 +70,6 @@ require (
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
-	github.com/inconshreveable/mousetrap v1.0.1 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect

go.sum

@@ -320,7 +320,6 @@ github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfc
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
-github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
@@ -696,8 +695,6 @@ github.com/imdario/mergo v0.3.11/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH
 github.com/imdario/mergo v0.3.12 h1:b6R2BslTbIEToALKP7LxUvijTsNI9TAe80pLWN2g/HU=
 github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
 github.com/inconshreveable/mousetrap v1.0.0/go.mod h1:PxqpIevigyE2G7u3NXJIT2ANytuPF1OarO4DADm73n8=
-github.com/inconshreveable/mousetrap v1.0.1 h1:U3uMjPSQEBMNp1lFxmllqCPM6P5u/Xq7Pgzkat/bFNc=
-github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/j-keck/arping v0.0.0-20160618110441-2cf9dc699c56/go.mod h1:ymszkNOg6tORTn+6F6j+Jc8TOr5osrynvN6ivFWZ2GA=
 github.com/jackc/chunkreader v1.0.0/go.mod h1:RT6O25fNZIuasFJRyZ4R/Y2BbhasbmZXF9QQ7T3kePo=
 github.com/jackc/chunkreader/v2 v2.0.0/go.mod h1:odVSm741yZoC3dpHEUXIqA9tQRhFrgOHwnPIn9lDKlk=
@@ -1127,8 +1124,6 @@ github.com/spf13/cobra v1.0.0/go.mod h1:/6GTrnGXV9HjY+aR4k0oJ5tcvakLuG6EuKReYlHN
 github.com/spf13/cobra v1.1.1/go.mod h1:WnodtKOvamDL/PwE2M4iKs8aMDBZ5Q5klgD3qfVJQMI=
 github.com/spf13/cobra v1.1.3/go.mod h1:pGADOWyqRD/YMrPZigI/zbliZ2wVD/23d+is3pSWzOo=
 github.com/spf13/cobra v1.2.1/go.mod h1:ExllRjgxM/piMAM+3tAZvg8fsklGAf3tPfi+i8t68Nk=
-github.com/spf13/cobra v1.6.0 h1:42a0n6jwCot1pUmomAp4T7DeMD+20LFv4Q54pxLf2LI=
-github.com/spf13/cobra v1.6.0/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
 github.com/spf13/jwalterweatherman v1.1.0 h1:ue6voC5bR5F8YxI5S67j9i582FU4Qvo2bmqnqMYADFk=
 github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=