Support Kubernetes version 1.20.15

.github/workflows/e2e.yaml

@@ -65,6 +65,7 @@ jobs:
       fail-fast: false
       matrix:
         kube-version:
+          - "1.20.15"
           - "1.23"
           - "1.30"
         test-scenario:
@@ -74,6 +75,8 @@ jobs:
           - "cli-upgrade"
           - "workload-lifecycle"
         include:
+          - kube-version: "1.20.15"
+            kind-image: "kindest/node:v1.20.15@sha256:a32bf55309294120616886b5338f95dd98a2f7231519c7dedcec32ba29699394"
           - kube-version: "1.23"
             kind-image: "kindest/node:v1.23.17@sha256:14d0a9a892b943866d7e6be119a06871291c517d279aedb816a4b4bc0ec0a5b3"
           - kube-version: "1.30"

autoscaler/controllers/collectorsgroup_controller.go

@@ -28,6 +28,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/log"
 
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/version"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 )
@@ -37,6 +38,7 @@ type CollectorsGroupReconciler struct {
 	Scheme               *runtime.Scheme
 	ImagePullSecrets     []string
 	OdigosVersion        string
+	K8sVersion           *version.Version
 	DisableNameProcessor bool
 	Config               *controllerconfig.ControllerConfig
 }
@@ -50,7 +52,7 @@ func (r *CollectorsGroupReconciler) Reconcile(ctx context.Context, req ctrl.Requ
 		return ctrl.Result{}, err
 	}
 
-	err = datacollection.Sync(ctx, r.Client, r.Scheme, r.ImagePullSecrets, r.OdigosVersion, r.DisableNameProcessor)
+	err = datacollection.Sync(ctx, r.Client, r.Scheme, r.ImagePullSecrets, r.OdigosVersion, r.K8sVersion, r.DisableNameProcessor)
 	if err != nil {
 		return ctrl.Result{}, err
 	}

autoscaler/controllers/datacollection/daemonset.go

@@ -10,6 +10,8 @@ import (
 	"github.com/odigos-io/odigos/autoscaler/controllers/common"
 	"github.com/odigos-io/odigos/autoscaler/controllers/datacollection/custom"
 	"github.com/odigos-io/odigos/autoscaler/utils"
+	"k8s.io/apimachinery/pkg/util/version"
+
 	"github.com/odigos-io/odigos/k8sutils/pkg/consts"
 	appsv1 "k8s.io/api/apps/v1"
 	corev1 "k8s.io/api/core/v1"
@@ -44,7 +46,8 @@ type DelayManager struct {
 }
 
 // RunSyncDaemonSetWithDelayAndSkipNewCalls runs the function with the specified delay and skips new calls until the function execution is finished
-func (dm *DelayManager) RunSyncDaemonSetWithDelayAndSkipNewCalls(delay time.Duration, retries int, dests *odigosv1.DestinationList, collection *odigosv1.CollectorsGroup, ctx context.Context, c client.Client, scheme *runtime.Scheme, secrets []string, version string) {
+func (dm *DelayManager) RunSyncDaemonSetWithDelayAndSkipNewCalls(delay time.Duration, retries int, dests *odigosv1.DestinationList,
+	collection *odigosv1.CollectorsGroup, ctx context.Context, c client.Client, scheme *runtime.Scheme, secrets []string, version string, k8sVersion *version.Version) {
 	dm.mu.Lock()
 	defer dm.mu.Unlock()
 
@@ -73,7 +76,7 @@ func (dm *DelayManager) RunSyncDaemonSetWithDelayAndSkipNewCalls(delay time.Dura
 		}()
 
 		for i := 0; i < retries; i++ {
-			_, err = syncDaemonSet(ctx, dests, collection, c, scheme, secrets, version)
+			_, err = syncDaemonSet(ctx, dests, collection, c, scheme, secrets, version, k8sVersion)
 			if err == nil {
 				return
 			}
@@ -88,7 +91,7 @@ func (dm *DelayManager) finishProgress() {
 }
 
 func syncDaemonSet(ctx context.Context, dests *odigosv1.DestinationList, datacollection *odigosv1.CollectorsGroup,
-	c client.Client, scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string) (*appsv1.DaemonSet, error) {
+	c client.Client, scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string, k8sVersion *version.Version) (*appsv1.DaemonSet, error) {
 	logger := log.FromContext(ctx)
 
 	odigletDaemonsetPodSpec, err := getOdigletDaemonsetPodSpec(ctx, c, datacollection.Namespace)
@@ -109,7 +112,7 @@ func syncDaemonSet(ctx context.Context, dests *odigosv1.DestinationList, datacol
 		logger.Error(err, "Failed to get signals from otelcol config")
 		return nil, err
 	}
-	desiredDs, err := getDesiredDaemonSet(datacollection, otelcolConfigContent, scheme, imagePullSecrets, odigosVersion, odigletDaemonsetPodSpec)
+	desiredDs, err := getDesiredDaemonSet(datacollection, otelcolConfigContent, scheme, imagePullSecrets, odigosVersion, k8sVersion, odigletDaemonsetPodSpec)
 	if err != nil {
 		logger.Error(err, "Failed to get desired DaemonSet")
 		return nil, err
@@ -166,7 +169,7 @@ func getOdigletDaemonsetPodSpec(ctx context.Context, c client.Client, namespace
 }
 
 func getDesiredDaemonSet(datacollection *odigosv1.CollectorsGroup, configData string,
-	scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string,
+	scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string, k8sVersion *version.Version,
 	odigletDaemonsetPodSpec *corev1.PodSpec,
 ) (*appsv1.DaemonSet, error) {
 	// TODO(edenfed): add log volumes only if needed according to apps or dests
@@ -179,7 +182,14 @@ func getDesiredDaemonSet(datacollection *odigosv1.CollectorsGroup, configData st
 	maxUnavailable := intstr.FromString("50%")
 	// maxSurge is the number of pods that can be created above the desired number of pods.
 	// we do not want more then 1 datacollection pod on the same node as they need to bind to oltp ports.
-	maxSurge := intstr.FromInt(0)
+	rollingUpdate := &appsv1.RollingUpdateDaemonSet{
+		MaxUnavailable: &maxUnavailable,
+	}
+	// maxSurge was added to the Kubernetes api at version 1.21.alpha1, we want to be sure so we used 1.22 for the check, the fallback is without it
+	if k8sVersion != nil && k8sVersion.AtLeast(version.MustParse("1.22.0")) {
+		maxSurge := intstr.FromInt(0)
+		rollingUpdate.MaxSurge = &maxSurge
+	}
 
 	desiredDs := &appsv1.DaemonSet{
 		ObjectMeta: metav1.ObjectMeta{
@@ -192,11 +202,8 @@ func getDesiredDaemonSet(datacollection *odigosv1.CollectorsGroup, configData st
 				MatchLabels: NodeCollectorsLabels,
 			},
 			UpdateStrategy: appsv1.DaemonSetUpdateStrategy{
-				Type: appsv1.RollingUpdateDaemonSetStrategyType,
-				RollingUpdate: &appsv1.RollingUpdateDaemonSet{
-					MaxUnavailable: &maxUnavailable,
-					MaxSurge:       &maxSurge,
-				},
+				Type:          appsv1.RollingUpdateDaemonSetStrategyType,
+				RollingUpdate: rollingUpdate,
 			},
 			Template: corev1.PodTemplateSpec{
 				ObjectMeta: metav1.ObjectMeta{

autoscaler/controllers/datacollection/root.go

@@ -8,6 +8,7 @@ import (
 	"github.com/odigos-io/odigos/k8sutils/pkg/consts"
 	"github.com/odigos-io/odigos/k8sutils/pkg/env"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/version"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/log"
 )
@@ -18,7 +19,7 @@ const (
 	syncDaemonsetRetry = 3
 )
 
-func Sync(ctx context.Context, c client.Client, scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string, disableNameProcessor bool) error {
+func Sync(ctx context.Context, c client.Client, scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string, k8sVersion *version.Version, disableNameProcessor bool) error {
 	logger := log.FromContext(ctx)
 
 	var instApps odigosv1.InstrumentedApplicationList
@@ -51,12 +52,12 @@ func Sync(ctx context.Context, c client.Client, scheme *runtime.Scheme, imagePul
 		return err
 	}
 
-	return syncDataCollection(&instApps, &dests, &processors, &dataCollectionCollectorGroup, ctx, c, scheme, imagePullSecrets, odigosVersion, disableNameProcessor)
+	return syncDataCollection(&instApps, &dests, &processors, &dataCollectionCollectorGroup, ctx, c, scheme, imagePullSecrets, odigosVersion, k8sVersion, disableNameProcessor)
 }
 
 func syncDataCollection(instApps *odigosv1.InstrumentedApplicationList, dests *odigosv1.DestinationList, processors *odigosv1.ProcessorList,
 	dataCollection *odigosv1.CollectorsGroup, ctx context.Context, c client.Client,
-	scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string, disableNameProcessor bool) error {
+	scheme *runtime.Scheme, imagePullSecrets []string, odigosVersion string, k8sVersion *version.Version, disableNameProcessor bool) error {
 	logger := log.FromContext(ctx)
 	logger.V(0).Info("Syncing data collection")
 
@@ -66,7 +67,7 @@ func syncDataCollection(instApps *odigosv1.InstrumentedApplicationList, dests *o
 		return err
 	}
 
-	dm.RunSyncDaemonSetWithDelayAndSkipNewCalls(time.Duration(env.GetSyncDaemonSetDelay())*time.Second, syncDaemonsetRetry, dests, dataCollection, ctx, c, scheme, imagePullSecrets, odigosVersion)
+	dm.RunSyncDaemonSetWithDelayAndSkipNewCalls(time.Duration(env.GetSyncDaemonSetDelay())*time.Second, syncDaemonsetRetry, dests, dataCollection, ctx, c, scheme, imagePullSecrets, odigosVersion, k8sVersion)
 
 	return nil
 }

autoscaler/controllers/instrumentedapplication_controller.go

@@ -23,6 +23,7 @@ import (
 	"github.com/odigos-io/odigos/autoscaler/controllers/datacollection"
 	predicate "github.com/odigos-io/odigos/k8sutils/pkg/predicate"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/version"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/log"
@@ -33,13 +34,14 @@ type InstrumentedApplicationReconciler struct {
 	Scheme               *runtime.Scheme
 	ImagePullSecrets     []string
 	OdigosVersion        string
+	K8sVersion           *version.Version
 	DisableNameProcessor bool
 }
 
 func (r *InstrumentedApplicationReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
 	logger := log.FromContext(ctx)
 	logger.V(0).Info("Reconciling InstrumentedApps")
-	err := datacollection.Sync(ctx, r.Client, r.Scheme, r.ImagePullSecrets, r.OdigosVersion, r.DisableNameProcessor)
+	err := datacollection.Sync(ctx, r.Client, r.Scheme, r.ImagePullSecrets, r.OdigosVersion, r.K8sVersion, r.DisableNameProcessor)
 	if err != nil {
 		return ctrl.Result{}, err
 	}

autoscaler/controllers/processor_controller.go

@@ -8,6 +8,7 @@ import (
 	"github.com/odigos-io/odigos/autoscaler/controllers/datacollection"
 	"github.com/odigos-io/odigos/autoscaler/controllers/gateway"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/util/version"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/log"
@@ -19,6 +20,7 @@ type ProcessorReconciler struct {
 	Scheme               *runtime.Scheme
 	ImagePullSecrets     []string
 	OdigosVersion        string
+	K8sVersion           *version.Version
 	DisableNameProcessor bool
 	Config               *controllerconfig.ControllerConfig
 }
@@ -33,7 +35,7 @@ func (r *ProcessorReconciler) Reconcile(ctx context.Context, req ctrl.Request) (
 		return ctrl.Result{}, err
 	}
 
-	err = datacollection.Sync(ctx, r.Client, r.Scheme, r.ImagePullSecrets, r.OdigosVersion, r.DisableNameProcessor)
+	err = datacollection.Sync(ctx, r.Client, r.Scheme, r.ImagePullSecrets, r.OdigosVersion, r.K8sVersion, r.DisableNameProcessor)
 	if err != nil {
 		return ctrl.Result{}, err
 	}

autoscaler/main.go

@@ -25,6 +25,7 @@ import (
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 
 	"github.com/odigos-io/odigos/k8sutils/pkg/env"
+	odigosver "github.com/odigos-io/odigos/k8sutils/pkg/version"
 
 	corev1 "k8s.io/api/core/v1"
 
@@ -45,6 +46,7 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+	"k8s.io/apimachinery/pkg/util/version"
 	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/healthz"
@@ -84,7 +86,6 @@ func main() {
 	var probeAddr string
 	var imagePullSecretsString string
 	var imagePullSecrets []string
-	odigosVersion := os.Getenv("ODIGOS_VERSION")
 
 	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
@@ -95,9 +96,15 @@ func main() {
 		"The image pull secrets to use for the collectors created by autoscaler")
 	flag.StringVar(&nameutils.ImagePrefix, "image-prefix", "", "The image prefix to use for the collectors created by autoscaler")
 
+	odigosVersion := os.Getenv("ODIGOS_VERSION")
 	if odigosVersion == "" {
 		flag.StringVar(&odigosVersion, "version", "", "for development purposes only")
 	}
+	// Get k8s version
+	k8sVersion, err := odigosver.GetKubernetesVersion()
+	if err != nil {
+		setupLog.Error(err, "unable to get Kubernetes version, continuing with default oldest supported version")
+	}
 
 	opts := ctrlzap.Options{
 		Development: true,
@@ -126,7 +133,8 @@ func main() {
 	nsSelector := client.InNamespace(odigosNs).AsSelector()
 	clusterCollectorLabelSelector := labels.Set(gateway.ClusterCollectorGateway).AsSelector()
 
-	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
+	cfg := ctrl.GetConfigOrDie()
+	mgr, err := ctrl.NewManager(cfg, ctrl.Options{
 		Scheme: scheme,
 		Metrics: metricsserver.Options{
 			BindAddress: metricsAddr,
@@ -162,10 +170,15 @@ func main() {
 		os.Exit(1)
 	}
 
-	err = MigrateCollectorsWorkloadToNewLabels(context.Background(), mgr.GetClient(), odigosNs)
-	if err != nil {
-		setupLog.Error(err, "unable to migrate collectors workload to new labels")
-		os.Exit(1)
+	// The labaling was for ver 1.0.91, migration is not releavant for old k8s versions which couln't run.
+	// This is the reason we skip it for versions < 1.23 (Also, versions < 1.23 require a non-caching client and API chane)
+	if k8sVersion != nil && k8sVersion.GreaterThan(version.MustParse("v1.23")) {
+		// Use the cached client for versions >= 1.23
+		err = MigrateCollectorsWorkloadToNewLabels(context.Background(), mgr.GetClient(), odigosNs)
+		if err != nil {
+			setupLog.Error(err, "unable to migrate collectors workload to new labels")
+			os.Exit(1)
+		}
 	}
 
 	// The name processor is used to transform device ids injected with the virtual device,
@@ -194,6 +207,7 @@ func main() {
 		Scheme:               mgr.GetScheme(),
 		ImagePullSecrets:     imagePullSecrets,
 		OdigosVersion:        odigosVersion,
+		K8sVersion:           k8sVersion,
 		DisableNameProcessor: disableNameProcessor,
 		Config:               config,
 	}).SetupWithManager(mgr); err != nil {
@@ -205,6 +219,7 @@ func main() {
 		Scheme:               mgr.GetScheme(),
 		ImagePullSecrets:     imagePullSecrets,
 		OdigosVersion:        odigosVersion,
+		K8sVersion:           k8sVersion,
 		DisableNameProcessor: disableNameProcessor,
 		Config:               config,
 	}).SetupWithManager(mgr); err != nil {
@@ -216,6 +231,7 @@ func main() {
 		Scheme:               mgr.GetScheme(),
 		ImagePullSecrets:     imagePullSecrets,
 		OdigosVersion:        odigosVersion,
+		K8sVersion:           k8sVersion,
 		DisableNameProcessor: disableNameProcessor,
 	}).SetupWithManager(mgr); err != nil {
 		setupLog.Error(err, "unable to create controller", "controller", "InstrumentedApplication")

cli/cmd/install.go

@@ -50,7 +50,7 @@ var (
 var (
 	// minK8SVersionForInstallation is the minimum Kubernetes version required for Odigos installation
 	// this value must be in sync with the one defined in the kubeVersion field in Chart.yaml
-	minK8SVersionForInstallation = version.MustParse("v1.23.0")
+	minK8SVersionForInstallation = version.MustParse("v1.20.15")
 )
 
 type ResourceCreationFunc func(ctx context.Context, cmd *cobra.Command, client *kube.Client, ns string) error
@@ -80,23 +80,22 @@ This command will install k8s components that will auto-instrument your applicat
 		// Check if the cluster meets the minimum requirements
 		kc := cmd.Flag("kubeconfig").Value.String()
 		details, err := autodetect.DetectK8SClusterDetails(ctx, kc, client)
-		if err == nil {
-			autodetect.CurrentKubernetesVersion = autodetect.KubernetesVersion{
-				Kind:    details.Kind,
-				Version: details.K8SVersion,
-			}
+		if !errors.Is(err, autodetect.ErrCannotDetectClusterKind) {
+			autodetect.CurrentKubernetesVersion.Kind = details.Kind
+			fmt.Printf("Detected cluster: Kubernetes kind: %s\n", details.Kind)
+		} else {
+			fmt.Println("Unknown Kubernetes cluster detected, proceeding with installation")
+		}
+
+		if !errors.Is(err, autodetect.ErrCannotDetectK8sVersion) {
+			autodetect.CurrentKubernetesVersion.Version = details.K8SVersion
 			if details.K8SVersion.LessThan(minK8SVersionForInstallation) {
 				fmt.Printf("\033[31mERROR\033[0m Odigos requires Kubernetes version %s or higher but found %s, aborting\n", minK8SVersionForInstallation.String(), details.K8SVersion.String())
 				os.Exit(1)
 			}
-			fmt.Printf("Detected cluster: %s Kubernetes version: %s\n", details.Kind, details.K8SVersion.String())
+			fmt.Printf("Detected cluster: Kubernetes version: %s\n", details.K8SVersion.String())
 		} else {
-			if errors.Is(err, autodetect.ErrCannotDetectClusterKind) {
-				fmt.Println("Unknown Kubernetes cluster detected, proceeding with installation")
-			}
-			if errors.Is(err, autodetect.ErrCannotDetectK8sVersion) {
-				fmt.Println("Unknown Kubernetes version detected, proceeding with installation")
-			}
+			fmt.Println("Unknown Kubernetes version detected, proceeding with installation")
 		}
 
 		var odigosProToken string

cli/cmd/resources/odiglet.go

@@ -19,6 +19,7 @@ import (
 	rbacv1 "k8s.io/api/rbac/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/util/intstr"
+	k8sversion "k8s.io/apimachinery/pkg/util/version"
 )
 
 const (
@@ -446,7 +447,15 @@ func NewOdigletDaemonSet(ns string, version string, imagePrefix string, imageNam
 	maxUnavailable := intstr.FromString("50%")
 	// maxSurge is the number of pods that can be created above the desired number of pods.
 	// we do not want more then 1 odiglet pod on the same node as it is not supported by the eBPF.
-	maxSurge := intstr.FromInt(0)
+	// Only set maxSurge if Kubernetes version is >= 1.22
+	// Prepare RollingUpdate based on version support for maxSurge
+	rollingUpdate := &appsv1.RollingUpdateDaemonSet{
+		MaxUnavailable: &maxUnavailable,
+	}
+	if autodetect.CurrentKubernetesVersion.Version != nil && autodetect.CurrentKubernetesVersion.Version.AtLeast(k8sversion.MustParse("v1.22")) {
+		maxSurge := intstr.FromInt(0)
+		rollingUpdate.MaxSurge = &maxSurge
+	}
 
 	return &appsv1.DaemonSet{
 		TypeMeta: metav1.TypeMeta{
@@ -467,11 +476,8 @@ func NewOdigletDaemonSet(ns string, version string, imagePrefix string, imageNam
 				},
 			},
 			UpdateStrategy: appsv1.DaemonSetUpdateStrategy{
-				Type: appsv1.RollingUpdateDaemonSetStrategyType,
-				RollingUpdate: &appsv1.RollingUpdateDaemonSet{
-					MaxUnavailable: &maxUnavailable,
-					MaxSurge:       &maxSurge,
-				},
+				Type:          appsv1.RollingUpdateDaemonSetStrategyType,
+				RollingUpdate: rollingUpdate,
 			},
 			Template: corev1.PodTemplateSpec{
 				ObjectMeta: metav1.ObjectMeta{