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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 21:34:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-7815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16344052#comment-16344052
] 

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

Thank you [~jlowe] for the response. I agree with 1. and 2. above. Since 3. would expose container
tokensĀ of other containers to the current container, how about mounting the app dir as read-write
and mounting an empty directory to containers other than the current one? This is a bit more
work (yes, a bit more hacky...) but it would achieve the accepted level of security with backward
compatibility.
{code:java}
# mkdir app
# mkdir /empty
# mkdir app/container1
# mkdir app/container2
# mkdir app/container3
# docker run -t -i -v /root/app:/app:rw -v /empty:/app/container1:ro -v /root/app/container2:/app/container2:rw
-v /empty:/app/container3:ro -bash
bash-4.4# touch /app/a.txt
bash-4.4# touch /app/container1/a.txt
touch: /app/container1/a.txt: Read-only file system
bash-4.4# touch /app/container2/a.txt
bash-4.4# touch /app/container3/a.txt
touch: /app/container3/a.txt: Read-only file system
# {code}

> 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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