Restrict Jobs

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: restrict-jobs
 5  annotations:
 6    policies.kyverno.io/title: Restrict Jobs
 7    policies.kyverno.io/category: Other
 8    policies.kyverno.io/severity: medium
 9    policies.kyverno.io/subject: Job
10    kyverno.io/kyverno-version: 1.10.0
11    kyverno.io/kubernetes-version: "1.26"
12    policies.kyverno.io/description: >-
13      Jobs can be created directly and indirectly via a CronJob controller.
14      In some cases, users may want to only allow Jobs if they are created via a CronJob.
15      This policy restricts Jobs so they may only be created by a CronJob.
16spec:
17  validationFailureAction: Enforce
18  rules:
19    - name: restrict-job-from-cronjob
20      match:
21        any:
22        - resources:
23            kinds:
24              - Job
25      preconditions:
26        any:
27          - key: "{{ request.object.metadata.ownerReferences[0].kind || '' }}"
28            operator: NotEquals
29            value: CronJob
30      validate:
31        message: Jobs are only allowed if spawned from CronJobs.
32        deny: {}