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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7446) Docker container privileged mode and --user flag contradict each other
Date Sat, 24 Feb 2018 01:53:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16375228#comment-16375228
] 

Eric Yang commented on YARN-7446:
---------------------------------

[~ebadger] Thank you for the review, but I can't move the free to end of the function for
both free statements in this patch because there are other return conditions that could happen
before end of the function.  I updated the patch to use strcasecmp.

> 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, YARN-7446.003.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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