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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-7815) Mount the filecache as read-only in Docker containers
Date Mon, 29 Jan 2018 21:59:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16344082#comment-16344082
] 

Miklos Szegedi commented on YARN-7815:
--------------------------------------

Thank you, for the replies [~jlowe] and [~eyang]. I understand now that container level isolation
is not possible.

I have one last question. Should not we remove this comment and code in this case?

[https://github.com/apache/hadoop/blob/7fd287b4af5a191f18ea92850b7d904e4b4fb693/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/ApplicationMaster.java#L670]

Based on what you said, removing the AM token is misleading, since a neighbor container can
grab it anyways by design.

> Mount the filecache as read-only in Docker containers
> -----------------------------------------------------
>
>                 Key: YARN-7815
>                 URL: https://issues.apache.org/jira/browse/YARN-7815
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Shane Kumpf
>            Assignee: Shane Kumpf
>            Priority: Major
>
> Currently, when using the Docker runtime, the filecache directories are mounted read-write
into the Docker containers. Read write access is not necessary. We should make this more restrictive
by changing that mount to read-only.



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