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From "Eric Badger (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7446) Docker container privileged mode and --user flag contradict each other
Date Tue, 13 Feb 2018 18:39:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16362853#comment-16362853
] 

Eric Badger commented on YARN-7446:
-----------------------------------

I don't see how that adds up though. The user is root, so they have all the privileges they
need. If we're assuming that they need to be in a certain group, then how can we assume that
they don't need the primary group? Is there a reason that they should have the additional
groups but not the primary group? I think the answer is that if they need one, they need all.
So we can either give them all or not give them any to be consistent.

> 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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