Disable Service Discovery

 1apiVersion: policies.kyverno.io/v1alpha1
 2kind: MutatingPolicy
 3metadata:
 4  name: disable-service-discovery
 5  annotations:
 6    policies.kyverno.io/title: Disable Service Discovery
 7    policies.kyverno.io/category: Other, EKS Best Practices
 8    policies.kyverno.io/subject: Pod
 9    kyverno.io/kyverno-version: 1.15.0
10    kyverno.io/kubernetes-version: "1.24"
11    policies.kyverno.io/minversion: 1.15.0
12    policies.kyverno.io/description: >-
13      Not all Pods require communicating with other Pods or resolving in-cluster Services.
14      For those, disabling service discovery can increase security as the Pods are limited
15      to what they can see. This policy mutates Pods to set dnsPolicy to `Default` and
16      enableServiceLinks to `false`.
17spec:
18  matchConstraints:
19    resourceRules:
20    - apiGroups: [""]
21      apiVersions: ["v1"]
22      operations: ["CREATE", "UPDATE"]
23      resources: ["pods"]
24  mutations:
25  - patchType: ApplyConfiguration
26    applyConfiguration:
27      expression: |
28        Object{
29          spec: Object.spec{
30            dnsPolicy: "Default",
31            enableServiceLinks: false
32          }
33        }
34  reinvocationPolicy: Never