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From "Daniel Templeton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5534) Allow whitelisted volume mounts
Date Tue, 18 Jul 2017 17:29:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-5534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16091851#comment-16091851
] 

Daniel Templeton commented on YARN-5534:
----------------------------------------

I agree with the opt-in model guarded by the admin-defined whitelist.  I also fail to see
the use case for admin-enforced mounts.  The nature of a container is that it's inscrutable
by the system, so there's no telling what's in there or whether any given mount point makes
any sense.

Given that these mounts are read-only and wholly at the discretion of the admin, I don't see
that it should be much of a risk.  The main use case for the feature is to make the Hadoop
directory mountable by the container, and I see no risk there.  As long as we clearly document
the risks in the feature docs, I don't see the need to add training wheels to try to keep
admins from shooting themselves in the foot.

> Allow whitelisted volume mounts 
> --------------------------------
>
>                 Key: YARN-5534
>                 URL: https://issues.apache.org/jira/browse/YARN-5534
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: yarn
>            Reporter: luhuichun
>            Assignee: Shane Kumpf
>         Attachments: YARN-5534.001.patch, YARN-5534.002.patch
>
>
> Introduction 
> Mounting files or directories from the host is one way of passing configuration and other
information into a docker container. 
> We could allow the user to set a list of mounts in the environment of ContainerLaunchContext
(e.g. /dir1:/targetdir1,/dir2:/targetdir2). 
> These would be mounted read-only to the specified target locations. This has been resolved
in YARN-4595
> 2.Problem Definition
> Bug mounting arbitrary volumes into a Docker container can be a security risk.
> 3.Possible solutions
> one approach to provide safe mounts is to allow the cluster administrator to configure
a set of parent directories as white list mounting directories.
>  Add a property named yarn.nodemanager.volume-mounts.white-list, when container executor
do mount checking, only the allowed directories or sub-directories can be mounted. 



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