Image pull policy of the container is not set to always

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Metadata

Id: caa3479d-885d-4882-9aac-95e5e78ef5c2

Cloud Provider: Kubernetes

Platform: Kubernetes

Severity: Low

Category: Insecure Configurations

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Description

The container imagePullPolicy must be set to Always. This requirement applies when the image is referenced with an explicit tag (contains ‘:’) and is not referenced by digest (@...) or by the :latest tag. Setting imagePullPolicy to Always ensures the image is pulled on every start and prevents relying on mutable images cached locally.

Compliant Code Examples

apiVersion: v1
kind: Pod
metadata:
  name: private-image-test-1
spec:
  containers:
    - name: uses-private-image
      image: $PRIVATE_IMAGE_NAME
      imagePullPolicy: Always
      command: [ "echo", "SUCCESS" ]

Non-Compliant Code Examples

apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment-with-image-pull-policy
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: library/nginx:1.20.0
          imagePullPolicy: IfNotPresent

apiVersion: apps/v1
kind: Deployment
metadata:
  name: deployment-with-image-pull-policy1
spec:
  replicas: 3
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
        - name: nginx
          image: library/nginx:1.20.0

apiVersion: v1
kind: Pod
metadata:
  name: private-image-test-always
spec:
  containers:
    - name: uses-private-image
      image: $PRIVATE_IMAGE_NAME:1.2
      imagePullPolicy: Never
      command: [ "echo", "SUCCESS" ]