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https://issues.apache.org/jira/browse/YARN-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13969803#comment-13969803
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jay vyas commented on YARN-1253:
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At this point, ANYONE who is running hadoop in SIMPLE mode cannot use a
LinuxContainerExector in a multitenant sort of way, at all.
Are we 100% sure that this is the only way to implement the security
improvements? Or is there a way we can make this more flexible?
> Changes to LinuxContainerExecutor to run containers as a single dedicated
> user in non-secure mode
> -------------------------------------------------------------------------------------------------
>
> Key: YARN-1253
> URL: https://issues.apache.org/jira/browse/YARN-1253
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: nodemanager
> Affects Versions: 2.1.0-beta
> Reporter: Alejandro Abdelnur
> Assignee: Roman Shaposhnik
> Priority: Blocker
> Fix For: 2.3.0
>
> Attachments: YARN-1253.patch.txt
>
>
> When using cgroups we require LCE to be configured in the cluster to start
> containers.
> When LCE starts containers as the user that submitted the job. While this
> works correctly in a secure setup, in an un-secure setup this presents a
> couple issues:
> * LCE requires all Hadoop users submitting jobs to be Unix users in all nodes
> * Because users can impersonate other users, any user would have access to
> any local file of other users
> Particularly, the second issue is not desirable as a user could get access to
> ssh keys of other users in the nodes or if there are NFS mounts, get to other
> users data outside of the cluster.
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