kubernetes PodSecurityPolicy设置为runAsNonRoot，容器具有runAsNonRoot，并且映像具有非数字用户（appuser），无法验证用户是否为非root用户

Question

kubernetes PodSecurityPolicy设置为runAsNonRoot，在获取错误后，pod无法启动错误：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root用户

我们正在docker容器中创建用户（appuser）uid-> 999和组（appgroup）gid-> 999，并从该用户启动容器。

但是吊舱创建引发错误。

    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

这是验证的实现：

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)

这是带有注释的验证调用：

// 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，在您的情况下该消息的唯一原因是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定义中执行以下操作：

securityContext:
    runAsUser: 999