kubernetes PodSecurityPolicy 设置为 runAsNonRoot，容器有 runAsNonRoot，图像有非数字用户（appuser），无法验证用户是非 root

Question

kubernetes PodSecurityPolicy 设置为 runAsNonRoot，pods 未启动 post 获取错误错误：容器具有 runAsNonRoot 且映像具有非数字用户（appuser），无法验证用户是否为非根

我们正在 docker 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 pod 时抛出错误。

    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

这里是验证的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)

这是 validation call 的评论：

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

如您所见，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 UID=999 的用户，您可以在 pod 定义中执行此操作 like that:

securityContext:
    runAsUser: 999

kubernetes PodSecurityPolicy 设置为 runAsNonRoot，容器有 runAsNonRoot，图像有非数字用户（appuser），无法验证用户是非 root

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

kubernetes

kubernetes-security