Abin Shahab commented on YARN-3282:

[~guoleitao], Can you not include everything you need inside the docker image? 
That's the premise of the docker container executor. It assumes that the user 
will provide a docker image that is self-sufficient and is not dependent on the 
nodemanager for any files or directories.

> DockerContainerExecutor should support environment variables setting
> --------------------------------------------------------------------
>                 Key: YARN-3282
>                 URL: https://issues.apache.org/jira/browse/YARN-3282
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: applications, nodemanager
>    Affects Versions: 2.6.0
>            Reporter: Leitao Guo
>         Attachments: YARN-3282.01.patch
> Currently, DockerContainerExecutor will mount "yarn.nodemanager.local-dirs" 
> and "yarn.nodemanager.log-dirs" to containers automatically. However 
> applications maybe need set more environment variables before launching 
> containers. 
> In our applications, just as the following command, we need to attach several 
> directories and set some environment variables to docker containers. 
> {code}
> docker run -i -t -v /data/transcode:/data/tmp -v /etc/qcs:/etc/qcs -v 
> /mnt:/mnt -e VTC_MQTYPE=rabbitmq -e VTC_APP=ugc -e VTC_LOCATION=sh -e 
> VTC_RUNTIME=vtc sequenceiq/hadoop-docker:2.6.0 /bin/bash
> {code}

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