[jira] [Commented] (YARN-1253) Changes to LinuxContainerExecutor to run containers as a single dedicated user in non-secure mode

["jay vyas (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13969803#comment-13969803 ] 

jay vyas commented on YARN-1253:
--------------------------------

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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