Require Multiple Replicas

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: deployment-has-multiple-replicas
 5  annotations:
 6    policies.kyverno.io/title: Require Multiple Replicas
 7    policies.kyverno.io/category: Sample
 8    policies.kyverno.io/severity: medium
 9    policies.kyverno.io/subject: Deployment
10    policies.kyverno.io/description: >-
11      Deployments with a single replica cannot be highly available and thus the application
12      may suffer downtime if that one replica goes down. This policy validates that Deployments
13      have more than one replica.          
14spec:
15  validationFailureAction: audit
16  rules:
17    - name: deployment-has-multiple-replicas
18      match:
19        resources:
20          kinds:
21          - Deployment
22      validate:
23        message: "Deployments should have more than one replica to ensure availability."
24        pattern:
25          spec:
26            replicas: ">1"