kubernetes PodSecurityPolicy设置为runAsNonRoot，容器具有runAsNonRoot，图像具有非数字用户(appuser)，无法验证用户是否是非根用户

Question

kubernetes PodSecurityPolicy设置为runAsNonRoot，pod未启动post后发现错误:容器具有runAsNonRoot，图像具有非数字用户(appuser)，无法验证用户是否是非根用户

我们将在停靠容器中创建用户(appuser) uid -> 999和组(appgroup) gid -> 999，并使用该用户启动容器。

但是创建的pod正在抛出错误。

    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

.

Answer 1

以下是验证的implementation：

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)

下面是带有注释的validation call：

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

正如您所看到的，在您的案例中出现这些消息的唯一原因是uid == nil。根据源代码中的注释，我们需要设置一个数字用户值。

因此，对于使用UID=999的用户，您可以在pod定义like that中执行此操作

securityContext:
    runAsUser: 999