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https://issues.apache.org/jira/browse/YARN-4266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15497423#comment-15497423
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Daniel Templeton commented on YARN-4266:
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I don't really like either option. 3.1 is a no-go for security reasons. 3.2
seems risky. First, just running usermod isn't enough, as explained in
https://muffinresearch.co.uk/linux-changing-uids-and-gids-for-user/ Second,
how can you guarantee that the new UID isn't already in use in the container?
Third, the reason we're having this discussion is because it's desirable to run
a container without modification. Modifying the container is not a valid
alternative to modifying the container. I think we still have some
brainstorming to do.
> Allow whitelisted users to disable user re-mapping/squashing when launching
> docker containers
> ---------------------------------------------------------------------------------------------
>
> Key: YARN-4266
> URL: https://issues.apache.org/jira/browse/YARN-4266
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: yarn
> Reporter: Sidharta Seethana
> Assignee: Zhankun Tang
> Attachments:
> YARN-4266_Allow_whitelisted_users_to_disable_user_re-mapping.pdf
>
>
> Docker provides a mechanism (the --user switch) that enables us to specify
> the user the container processes should run as. We use this mechanism today
> when launching docker containers . In non-secure mode, we run the docker
> container based on
> `yarn.nodemanager.linux-container-executor.nonsecure-mode.local-user` and in
> secure mode, as the submitting user. However, this mechanism breaks down with
> a large number of 'pre-created' images which don't necessarily have the users
> available within the image. Examples of such images include shared images
> that need to be used by multiple users. We need a way in which we can allow a
> pre-defined set of users to run containers based on existing images, without
> using the --user switch. There are some implications of disabling this user
> squashing that we'll need to work through : log aggregation, artifact
> deletion etc.,
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