Search code examples
kuberneteskubernetes-security

kubernetes PodSecurityPolicy set to runAsNonRoot, container has runAsNonRoot and image has non-numeric user (appuser), cannot verify user is non-root

kubernetes PodSecurityPolicy set to runAsNonRoot, pods are not getting started post that Getting error Error: container has runAsNonRoot and image has non-numeric user (appuser), cannot verify user is non-root

We are creating the user (appuser) uid -> 999 and group (appgroup) gid -> 999 in the docker container, and we are starting the container with that user.

But the pod creating is throwing error.

Events:
  Type     Reason                 Age                From                           Message
  ----     ------                 ----               ----                           -------
  Normal   Scheduled              53s                default-scheduler              Successfully assigned app-578576fdc6-nfvcz to appmagent01
  Normal   SuccessfulMountVolume  52s                kubelet, appagent01  MountVolume.SetUp succeeded for volume "default-token-ksn46"
  Warning  DNSConfigForming       11s (x6 over 52s)  kubelet, appagent01  Search Line limits were exceeded, some search paths have been omitted, the applied search line is: app.svc.cluster.local svc.cluster.local cluster.local 
  Normal   Pulling                11s (x5 over 51s)  kubelet, appagent01  pulling image "app.dockerrepo.internal.com:5000/app:9f51e3e7ab91bb835d3b85f40cc8e6f31cdc2982"
  Normal   Pulled                 11s (x5 over 51s)  kubelet, appagent01  Successfully pulled image "app.dockerrepo.internal.com:5000/app:9f51e3e7ab91bb835d3b85f40cc8e6f31cdc2982"
  Warning  Failed                 11s (x5 over 51s)  kubelet, appagent01  Error: container has runAsNonRoot and image has non-numeric user (appuser), cannot verify user is non-root
Solution

  • Here is the implementation of the verification:

    case uid == nil && len(username) > 0:
    return fmt.Errorf("container has runAsNonRoot and image has non-numeric user (%s), cannot verify user is non-root", username)

    And here is the validation call with the comment:

    // Verify RunAsNonRoot. Non-root verification only supports numeric user.
if err := verifyRunAsNonRoot(pod, container, uid, username); err != nil {
    return nil, cleanupAction, err
}

    As you can see, the only reason of that messages in your case is uid == nil. Based on the comment in the source code, we need to set a numeric user value.

    So, for the user with UID=999 you can do it in your pod definition like that:

    securityContext:
    runAsUser: 999