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