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https://issues.apache.org/jira/browse/FLINK-24212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17412389#comment-17412389
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Yangze Guo commented on FLINK-24212:
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I'll take a look.
> kerberos krb5.conf file is mounted as empty directory, not the expected file
> ----------------------------------------------------------------------------
>
> Key: FLINK-24212
> URL: https://issues.apache.org/jira/browse/FLINK-24212
> Project: Flink
> Issue Type: Bug
> Components: Deployment / Kubernetes
> Affects Versions: 1.12.1, 1.13.1, 1.13.2
> Reporter: LiuZeshan
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.14.1
>
> Attachments: mykrb5conf.yaml
>
>
> From FLINK-18971，we can mount kerberos krb5 conf file to pod with path
> /etc/krb5.conf，however if the krb5 conf file is not named krb5.conf (e.g
> named mykrb5.conf)，the mount path /etc/krb5.conf in pod will be an empty
> directory, not a file that we expect.
> {code:java}
> root@mykrb5-conf-test-6dd5c76f87-vfwh5:/# ls /etc/krb5.conf/ -la
> total 8
> drwxrwxrwx 2 root root 4096 Sep 8 10:42 .
> drwxr-xr-x 1 root root 4096 Sep 8 10:42 ..{code}
>
> The reason is that, the code in
> [KerberosMountDecrator#decroateFlinkPod|https://github.com/apache/flink/blob/7e91e82fca999ddefa7ebdf198b8cfd3b6998b8b/flink-kubernetes/src/main/java/org/apache/flink/kubernetes/kubeclient/decorators/KerberosMountDecorator.java#L110],
> we create the deployment like this:
> {code:java}
> ...
> volumeMounts:
> - mountPath: /etc/krb5.conf
> name: my-krb5conf-volume
> subPath: krb5.conf
> ...
> volumes:
> - configMap:
> defaultMode: 420
> items:
> - key: mykrb5.conf
> path: mykrb5.conf
> name: my-krb5conf
> name: my-krb5conf-volume
> {code}
> path value should be set to const value "krb5.conf", not the file name that
> user provide (path: mykrb5.conf).
> we can use the yaml description file attachment to reproduce the problem.
> [^mykrb5conf.yaml]
>
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