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https://issues.apache.org/jira/browse/YARN-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361107#comment-16361107
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Eric Badger edited comment on YARN-7446 at 2/12/18 5:21 PM:
------------------------------------------------------------

Another thing I just found while testing out YARN-7221 is that this patch 
doesn't remove the {{\-\-group\-add}} calls, which accompany the {{--user}}. 
Those should be disabled as well


was (Author: ebadger):
Another thing I just found while testing out YARN-7221 is that this patch 
doesn't remove the "--group-add" calls, which accompany the "--user". Those 
should be disabled as well

> Docker container privileged mode and --user flag contradict each other
> ----------------------------------------------------------------------
>
>                 Key: YARN-7446
>                 URL: https://issues.apache.org/jira/browse/YARN-7446
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 3.0.0
>            Reporter: Eric Yang
>            Assignee: Eric Yang
>            Priority: Major
>         Attachments: YARN-7446.001.patch, YARN-7446.002.patch
>
>
> In the current implementation, when privileged=true, --user flag is also 
> passed to docker for launching container.  In reality, the container has no 
> way to use root privileges unless there is sticky bit or sudoers in the image 
> for the specified user to gain privileges again.  To avoid duplication of 
> dropping and reacquire root privileges, we can reduce the duplication of 
> specifying both flag.  When privileged mode is enabled, --user flag should be 
> omitted.  When non-privileged mode is enabled, --user flag is supplied.



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