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From "Shane Kumpf (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-5534) Allow whitelisted volume mounts
Date Wed, 19 Jul 2017 12:58:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-5534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16093026#comment-16093026

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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