secureCodeBox
diff --git a/operator/apis/execution/v1/scheduledscan_types.go b/operator/apis/execution/v1/scheduledscan_types.go
@@ -29,11 +29,20 @@ type ScheduledScanSpec struct {
 	// +kubebuilder:validation:Optional
 	// +kubebuilder:validation:Minimum=0
 	SuccessfulJobsHistoryLimit *int32 `json:"successfulJobsHistoryLimit,omitempty"`
+
 	// FailedJobsHistoryLimit determines how many failed past Scans will be kept until the oldest one will be deleted, defaults to 3. When set to 0, Scans will be deleted directly after failure
 	// +kubebuilder:validation:Optional
 	// +kubebuilder:validation:Minimum=0
 	FailedJobsHistoryLimit *int32 `json:"failedJobsHistoryLimit,omitempty"`
 
+	// Specifies how to treat concurrent executions of a Job.
+	// Valid values are:
+	// - "Allow" (default): allows CronJobs to run concurrently;
+	// - "Forbid": forbids concurrent runs, skipping next run if previous run hasn't finished yet;
+	// - "Replace": cancels currently running job and replaces it with a new one
+	// +optional
+	ConcurrencyPolicy ConcurrencyPolicy `json:"concurrencyPolicy,omitempty"`
+
 	// ScanSpec describes the scan which should be started regularly
 	ScanSpec *ScanSpec `json:"scanSpec"`
 
@@ -43,6 +52,25 @@ type ScheduledScanSpec struct {
 	RetriggerOnScanTypeChange bool `json:"retriggerOnScanTypeChange,omitempty"`
 }
 
+// ConcurrencyPolicy describes how the job will be handled.
+// Only one of the following concurrent policies may be specified.
+// If none of the following policies is specified, the default one
+// is AllowConcurrent.
+// +kubebuilder:validation:Enum=Allow;Forbid;Replace
+type ConcurrencyPolicy string
+
+const (
+	// AllowConcurrent allows CronJobs to run concurrently.
+	AllowConcurrent ConcurrencyPolicy = "Allow"
+
+	// ForbidConcurrent forbids concurrent runs, skipping next run if previous
+	// hasn't finished yet.
+	ForbidConcurrent ConcurrencyPolicy = "Forbid"
+
+	// ReplaceConcurrent cancels currently running job and replaces it with a new one.
+	ReplaceConcurrent ConcurrencyPolicy = "Replace"
+)
+
 // ScheduledScanStatus defines the observed state of ScheduledScan
 type ScheduledScanStatus struct {
 	// INSERT ADDITIONAL STATUS FIELD - define observed state of cluster

diff --git a/operator/config/crd/bases/execution.securecodebox.io_scheduledscans.yaml b/operator/config/crd/bases/execution.securecodebox.io_scheduledscans.yaml
@@ -62,6 +62,17 @@ spec:
           spec:
             description: ScheduledScanSpec defines the desired state of ScheduledScan
             properties:
+              concurrencyPolicy:
+                description: 'Specifies how to treat concurrent executions of a Job.
+                  Valid values are: - "Allow" (default): allows CronJobs to run concurrently;
+                  - "Forbid": forbids concurrent runs, skipping next run if previous
+                  run hasn''t finished yet; - "Replace": cancels currently running
+                  job and replaces it with a new one'
+                enum:
+                - Allow
+                - Forbid
+                - Replace
+                type: string
               failedJobsHistoryLimit:
                 description: FailedJobsHistoryLimit determines how many failed past
                   Scans will be kept until the oldest one will be deleted, defaults

diff --git a/operator/controllers/execution/scantype_controller_test.go b/operator/controllers/execution/scantype_controller_test.go
@@ -36,7 +36,7 @@ var _ = Describe("ScanType controller", func() {
 
 			createNamespace(ctx, namespace)
 			createScanType(ctx, namespace)
-			scheduledScan := createScheduledScanWithInterval(ctx, namespace, true)
+			scheduledScan := createScheduledScanWithInterval(ctx, namespace, true, 42*time.Hour, executionv1.ForbidConcurrent)
 
 			// ensure that the ScheduledScan has been triggered
 			waitForScheduledScanToBeTriggered(ctx, namespace, timeout)
@@ -77,7 +77,7 @@ var _ = Describe("ScanType controller", func() {
 
 			createNamespace(ctx, namespace)
 			createScanType(ctx, namespace)
-			scheduledScan := createScheduledScanWithInterval(ctx, namespace, true)
+			scheduledScan := createScheduledScanWithInterval(ctx, namespace, true, 42*time.Hour, executionv1.ForbidConcurrent)
 
 			// ensure that the ScheduledScan has been triggered
 			waitForScheduledScanToBeTriggered(ctx, namespace, timeout)
@@ -107,7 +107,7 @@ var _ = Describe("ScanType controller", func() {
 
 			createNamespace(ctx, namespace)
 			createScanType(ctx, namespace)
-			scheduledScan := createScheduledScanWithInterval(ctx, namespace, false)
+			scheduledScan := createScheduledScanWithInterval(ctx, namespace, false, 42*time.Hour, executionv1.ForbidConcurrent)
 
 			// ensure that the ScheduledScan has been triggered
 			waitForScheduledScanToBeTriggered(ctx, namespace, timeout)

diff --git a/operator/controllers/execution/scheduledscan_controller.go b/operator/controllers/execution/scheduledscan_controller.go
@@ -112,8 +112,30 @@ func (r *ScheduledScanReconciler) Reconcile(ctx context.Context, req ctrl.Reques
 		return ctrl.Result{}, err
 	}
 
+	InProgressScans := getScansInProgress(childScans.Items)
+
 	// check if it is time to start the next Scan
 	if !time.Now().Before(nextSchedule) {
+		// check concurrency policy
+		if scheduledScan.Spec.ConcurrencyPolicy == executionv1.ForbidConcurrent && len(InProgressScans) > 0 {
+			log.V(8).Info("concurrency policy blocks concurrent runs, skipping", "num active", len(InProgressScans))
+			r.Recorder.Event(&scheduledScan, "Normal", "ConcurrencyPolicyBlocks", "Concurrency policy blocks concurrent runs, skipping")
+			return ctrl.Result{RequeueAfter: 1 * time.Minute}, nil
+		}
+
+		// ...or instruct us to replace existing ones...
+		if scheduledScan.Spec.ConcurrencyPolicy == executionv1.ReplaceConcurrent {
+			for _, scan := range InProgressScans {
+				// we don't care if the job was already deleted
+				if err := r.Delete(context.Background(), &scan, client.PropagationPolicy(metav1.DeletePropagationBackground)); (err) != nil {
+					log.Error(err, "unable to delete active job", "job", scan)
+					r.Recorder.Event(&scheduledScan, "Warning", "JobDeletionFailed", fmt.Sprintf("Unable to delete active job: %s, error: %v", scan.Name, err))
+					return ctrl.Result{}, err
+				}
+				r.Recorder.Event(&scheduledScan, "Normal", "JobReplaced", fmt.Sprintf("Active job %s replaced", scan.Name))
+			}
+		}
+
 		if scheduledScan.Spec.RetriggerOnScanTypeChange == true {
 			// generate hash for current state of the configured ScanType
 			var scanType executionv1.ScanType
@@ -237,6 +259,22 @@ func getScansWithState(scans []executionv1.Scan, state string) []executionv1.Sca
 	return newScans
 }
 
+// Returns a sorted list of scans in progress
+func getScansInProgress(scans []executionv1.Scan) []executionv1.Scan {
+	// Get a sorted list of scans.
+	var newScans []executionv1.Scan
+	for _, scan := range scans {
+		if scan.Status.State != "Done" && scan.Status.State != "Errored" {
+			newScans = append(newScans, scan)
+		}
+	}
+	sort.Slice(newScans, func(i, j int) bool {
+		return newScans[i].ObjectMeta.CreationTimestamp.Before(&newScans[j].ObjectMeta.CreationTimestamp)
+	})
+
+	return newScans
+}
+
 // DeleteOldScans when exceeding the history limit
 func (r *ScheduledScanReconciler) deleteOldScans(scans []executionv1.Scan, maxCount int32) error {
 	for i, scan := range scans {

diff --git a/operator/controllers/execution/scheduledscan_controller_test.go b/operator/controllers/execution/scheduledscan_controller_test.go
@@ -9,6 +9,7 @@ package controllers
 
 import (
 	"context"
+	"time"
 
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -75,7 +76,7 @@ var _ = Describe("ScheduledScan controller", func() {
 
 			createNamespace(ctx, namespace)
 			createScanType(ctx, namespace)
-			scheduledScan := createScheduledScanWithInterval(ctx, namespace, true)
+			scheduledScan := createScheduledScanWithInterval(ctx, namespace, true, 42*time.Hour, executionv1.ForbidConcurrent)
 
 			var scanlist executionv1.ScanList
 			// ensure that the ScheduledScan has been triggered
@@ -108,4 +109,72 @@ var _ = Describe("ScheduledScan controller", func() {
 			Expect(scheduledScan.Status.Findings.FindingCategories).Should(Equal(map[string]uint64{"Open Port": 42}))
 		})
 	})
+
+	Context("A Scan is triggred due to a Scheduled Scan with a ConcurrencyPolicy", func() {
+		It("A second scheduled scan should not start before the first one is finished if the concurency policy is set to ForbidConcurrent", func() {
+
+			ctx := context.Background()
+			namespace := "scheduled-scan-triggerd-concurrency-forbid-test"
+			createNamespace(ctx, namespace)
+			createScanType(ctx, namespace)
+			createScheduledScanWithInterval(ctx, namespace, true, 1*time.Second, executionv1.ForbidConcurrent)
+
+			var scanlist executionv1.ScanList
+			// ensure that the ScheduledScan has been triggered
+			waitForScheduledScanToBeTriggered(ctx, namespace, timeout)
+			k8sClient.List(ctx, &scanlist, client.InNamespace(namespace))
+
+			Expect(scanlist.Items).Should(HaveLen(1))
+			time.Sleep(2 * time.Second)
+			// make sure that no second scan has been triggered
+			k8sClient.List(ctx, &scanlist, client.InNamespace(namespace))
+			Expect(scanlist.Items).Should(HaveLen(1))
+
+		})
+
+		It("A second scheduled scan should start before the first one is finished if the concurency policy is set to AllowConcurrent", func() {
+
+			ctx := context.Background()
+			namespace := "scheduled-scan-triggerd-concurrency-allow-test"
+			createNamespace(ctx, namespace)
+			createScanType(ctx, namespace)
+			createScheduledScanWithInterval(ctx, namespace, true, 1*time.Second, executionv1.AllowConcurrent)
+
+			var scanlist executionv1.ScanList
+			// ensure that the ScheduledScan has been triggered
+			waitForScheduledScanToBeTriggered(ctx, namespace, timeout)
+			k8sClient.List(ctx, &scanlist, client.InNamespace(namespace))
+			Expect(scanlist.Items).ShouldNot(BeEmpty())
+
+			time.Sleep(2 * time.Second)
+
+			// make sure more than one scan has been triggered
+			k8sClient.List(ctx, &scanlist, client.InNamespace(namespace))
+			Expect(scanlist.Items).ShouldNot(HaveLen(1))
+		})
+
+		It("A second scheduled scan should replace the first one, before the first one is finished if the concurency policy is set to ReplaceConcurrent", func() {
+
+			ctx := context.Background()
+			namespace := "scheduled-scan-triggerd-concurrency-replace-test"
+			createNamespace(ctx, namespace)
+			createScanType(ctx, namespace)
+			createScheduledScanWithInterval(ctx, namespace, true, 1*time.Second, executionv1.ReplaceConcurrent)
+
+			var scanlist executionv1.ScanList
+			// ensure that the ScheduledScan has been triggered
+			waitForScheduledScanToBeTriggered(ctx, namespace, timeout)
+			k8sClient.List(ctx, &scanlist, client.InNamespace(namespace))
+			Expect(scanlist.Items).Should(HaveLen(1))
+			firstScanName := scanlist.Items[0].Name
+
+			time.Sleep(2 * time.Second)
+
+			// make sure the first scan has been replaced
+			k8sClient.List(ctx, &scanlist, client.InNamespace(namespace))
+			secondScanName := scanlist.Items[0].Name
+			Expect(scanlist.Items).Should(HaveLen(1))
+			Expect(firstScanName).ShouldNot(Equal(secondScanName))
+		})
+	})
 })
diff --git a/operator/controllers/execution/test_utils_test.go b/operator/controllers/execution/test_utils_test.go
@@ -66,7 +66,7 @@ func createScanType(ctx context.Context, namespace string) {
 	Expect(k8sClient.Create(ctx, scanType)).Should(Succeed())
 }
 
-func createScheduledScanWithInterval(ctx context.Context, namespace string, retriggerOnScanTypeChange bool) executionv1.ScheduledScan {
+func createScheduledScanWithInterval(ctx context.Context, namespace string, retriggerOnScanTypeChange bool, interval time.Duration, concurrencyPolicy executionv1.ConcurrencyPolicy) executionv1.ScheduledScan {
 	namespaceLocalResourceMode := executionv1.NamespaceLocal
 
 	scheduledScan := executionv1.ScheduledScan{
@@ -75,8 +75,9 @@ func createScheduledScanWithInterval(ctx context.Context, namespace string, retr
 			Namespace: namespace,
 		},
 		Spec: executionv1.ScheduledScanSpec{
-			Interval:                  metav1.Duration{Duration: 42 * time.Hour},
+			Interval:                  metav1.Duration{Duration: interval},
 			RetriggerOnScanTypeChange: retriggerOnScanTypeChange,
+			ConcurrencyPolicy:         concurrencyPolicy,
 			ScanSpec: &executionv1.ScanSpec{
 				ScanType:     "nmap",
 				ResourceMode: &namespaceLocalResourceMode,