Disable Service Discovery

Not all Pods require communicating with other Pods or resolving in-cluster Services. For those, disabling service discovery can increase security as the Pods are limited to what they can see. This policy mutates Pods to set dnsPolicy to `Default` and enableServiceLinks to `false`.

Policy Definition

/other/disable_service_discovery/disable-service-discovery.yaml

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 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: 1.8.0-rc2
10    kyverno.io/kubernetes-version: "1.24"
11    policies.kyverno.io/minversion: 1.6.0
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  rules:
19  - name: example-configmap-lookup
20    match:
21      any:
22      - resources:
23          kinds:
24          - Pod
25    mutate:
26      patchStrategicMerge:
27        spec:
28          dnsPolicy: Default
29          enableServiceLinks: false

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