kyverno/samples/DisallowRootUser.md

Run as non-root user

By default, all processes in a container run as the root user (uid 0). To prevent potential compromise of container hosts, specify a non-root user and least privileged user ID when building the container image and require that application containers run as non-root users (i.e. set runAsNonRoot to true).

Additional Information

• Pod Security Context

Policy YAML

disallow_root_user.yaml

apiVersion: kyverno.io/v1
kind: ClusterPolicy
metadata:
  name: disallow-root-user
spec:
  validationFailureAction: audit
  rules:
  - name: validate-runAsNonRoot
    match:
      resources:
        kinds:
        - Pod
    validate:
      message: "Running as root user is not allowed. Set runAsNonRoot to true"
      anyPattern:
      - spec:
          securityContext:
            runAsNonRoot: true
      - spec:
          securityContext:
            runAsUser: ">0"
      - spec:
          containers:
          - securityContext:
              runAsNonRoot: true
      - spec:
          containers:
          - securityContext:
              runAsUser: ">0"