Always pull images admission control plugin not set

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Metadata

Id: a77f4d07-c6e0-4a48-8b35-0eeb51576f4f

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Medium

Category: Build Process

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Description

When running kube-apiserver, the --enable-admission-plugins flag should include AlwaysPullImages. The plugin must be enabled on the kube-apiserver command line and configured correctly in the admission control configuration file. If AlwaysPullImages is not present, image pull behavior may not be enforced.

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=AlwaysPullImages", "--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=AlwaysPullImages", "--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