Image policy webhook admission control plugin not set

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Metadata

Id: 14abda69-8e91-4acb-9931-76e2bee90284

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Low

Category: Build Process

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Description

When running kube-apiserver, the --enable-admission-plugins flag should include ImagePolicyWebhook, and the plugin must be configured in the admission control configuration file so it is operational. If the --enable-admission-plugins flag does not contain ImagePolicyWebhook, this rule reports a missing attribute for the kube-apiserver container.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--enable-admission-plugins=ImagePolicyWebhook", "--admission-control-config-file=path/to/plugin/config/file.yaml"]
  restartPolicy: OnFailure

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver","--enable-admission-plugins=ImagePolicyWebhook", "--admission-control-config-file=path/to/plugin/config/file.yaml"]
      args: []
  restartPolicy: OnFailure

Non-Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: command-demo
  labels:
    purpose: demonstrate-command
spec:
  containers:
    - name: command-demo-container
      image: gcr.io/google_containers/kube-apiserver-amd64:v1.6.0
      command: ["kube-apiserver"]
      args: ["--enable-admission-plugins=AlwaysAdmit"]
  restartPolicy: OnFailure