Disallow Latest Tag

 1apiVersion: kyverno.io/v1
 2kind: ClusterPolicy
 3metadata:
 4  name: disallow-latest-tag
 5  annotations:
 6    policies.kyverno.io/title: Disallow Latest Tag
 7    policies.kyverno.io/category: Best Practices
 8    policies.kyverno.io/minversion: 1.6.0
 9    policies.kyverno.io/severity: medium
10    policies.kyverno.io/subject: Pod
11    policies.kyverno.io/description: >-
12      The ':latest' tag is mutable and can lead to unexpected errors if the
13      image changes. A best practice is to use an immutable tag that maps to
14      a specific version of an application Pod. This policy validates that the image
15      specifies a tag and that it is not called `latest`.      
16spec:
17  validationFailureAction: audit
18  background: true
19  rules:
20  - name: require-image-tag
21    match:
22      any:
23      - resources:
24          kinds:
25          - Pod
26    validate:
27      message: "An image tag is required."
28      pattern:
29        spec:
30          containers:
31          - image: "*:*"
32  - name: validate-image-tag
33    match:
34      any:
35      - resources:
36          kinds:
37          - Pod
38    validate:
39      message: "Using a mutable image tag e.g. 'latest' is not allowed."
40      pattern:
41        spec:
42          containers:
43          - image: "!*:latest"