Eric Yang commented on YARN-7446:

[~ebadger] uid:gid will only set primary group.  {{\-\-group-add}} call is 
still required for adding membership of secondary groups to ensure the 
container user have the exact same rights as he does in host system.  Given 
this reason, do we need to remove {{\-\-group-add}}?

> 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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