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

Question

kubernetes PodSecurityPolicy 设置为

runAsNonRoot

，出现错误后 pod 未启动

Error: container has runAsNonRoot and image has non-numeric user (appuser), cannot verify user is non-root

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

以下是验证的实现：

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)

这是验证调用，并附有评论：

// 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，您的案例中出现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 定义中执行此操作像这样：

securityContext:
    runAsUser: 999

Answer 2

将此

USER

添加到 Dockerfile 解决了我的问题。这里9000是任意数字

USER 9000:9000

Answer 3

这对我有用。在

route.yml

文件上，将 spec.host 值更改为集群允许您拥有权限的正确级别。就我而言，它是：

来自：

maximo-lab.domain.com 

至：

maximo-lab.subdomain.domain.com

我还在 Redhat 上查看了这篇文章，但没有找到适合我的答案。它可能会给其他人带来答案。 https://developers.redhat.com/blog/2020/10/26/adapting-docker-and-kubernetes-containers-to-run-on-red-hat-openshift-container-platform#how_to_debug_issues