Add Network Policy

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: add-networkpolicy
 5  annotations:
 6    policies.kyverno.io/title: Add Network Policy
 7    policies.kyverno.io/category: Multi-Tenancy
 8    policies.kyverno.io/subject: NetworkPolicy
 9    policies.kyverno.io/description: >-
10      By default, Kubernetes allows communications across all Pods within a cluster. 
11      The NetworkPolicy resource and a CNI plug-in that supports NetworkPolicy must be used to restrict 
12      communications. A default NetworkPolicy should be configured for each Namespace to 
13      default deny all ingress and egress traffic to the Pods in the Namespace. Application 
14      teams can then configure additional NetworkPolicy resources to allow desired traffic 
15      to application Pods from select sources. This policy will create a new NetworkPolicy resource
16      named `default-deny` which will deny all traffic anytime a new Namespace is created.      
17spec:
18  validationFailureAction: audit
19  rules:
20  - name: default-deny
21    match:
22      resources: 
23        kinds:
24        - Namespace
25    generate:
26      kind: NetworkPolicy
27      name: default-deny
28      namespace: "{{request.object.metadata.name}}"
29      synchronize: true
30      data:
31        spec:
32          # select all pods in the namespace
33          podSelector: {}
34          # deny all traffic
35          policyTypes: 
36          - Ingress
37          - Egress