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https://issues.apache.org/jira/browse/YARN-5534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16093026#comment-16093026
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Shane Kumpf commented on YARN-5534:
-----------------------------------
Thanks [~ebadger] and [~templedf] for the feedback.
{quote}I was thinking of the current code where we are bind-mounting
"/sys/fs/cgroup" for every container.{quote}
Part of the point of the mount whitelist is so we can remove the hard coded
/sys/fs/cgroup mount. That really doesn't apply to all containers, for instance
CentOS 6, and actually introduces odd behavior on systems with many cores.
{quote}For my use case, we would always want to bind mount "/var/run/nscd" so
that users can do lookups inside of the container and utilize the host's
configs and cache. With the current state of affairs over in YARN-4266, if we
enter the container as a UID:GID pair, MRAppMaster will fail if we don't
bind-mount "/var/run/nscd".{quote}
I think we could solve the need above through documentation, but I can
understand the convenience of having an auto bind mount list. IMO, I think that
feature might be better suited as a separate patch though, since it will
essentially bypass the whitelist.
> 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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