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From Tomasz Fruboes <Tomasz.Frub...@fuw.edu.pl>
Subject Re: YARN and LinuxContainerExecutor in simple security mode
Date Tue, 30 Jun 2015 11:56:15 GMT
Dear Ravi,

  thanks for answer. I went through the discussion in the ticket you 
mention and did some experimentation. My understanding is the following 
- as long as I dont explicitly allow for this using

  hadoop.proxyuser.username.groups
  hadoop.proxyuser.username.hosts

user processes spawned by yarn on worknodes will always run with the uid 
of that user. Is that right?

  Thanks,
   Tomasz




W dniu 29.06.2015 o 21:43, Ravi Prakash pisze:
> Hi Tomasz!
>
> It is tricky to set up, but there are no implications to security if you
> configure it correctly. Please read the discussion on [YARN-2424] LCE
> should support non-cgroups, non-secure mode - ASF JIRA
> <https://issues.apache.org/jira/browse/YARN-2424>
>
> HTH
> Ravi
> 	
> 	
> 	
> 	
> [YARN-2424] LCE should support non-cgroups, non-secure mode - ASF JIRA
> <https://issues.apache.org/jira/browse/YARN-2424>
> After YARN-1253, LCE no longer works for non-secure, non-cgroup scenarios.
> View on issues.apache.org <https://issues.apache.org/jira/browse/YARN-2424>
> 	
> Preview by Yahoo
>
>
>
>
>
>
> On Thursday, June 25, 2015 2:30 AM, Tomasz Fruboes
> <Tomasz.Fruboes@fuw.edu.pl> wrote:
>
>
> Dear Experts,
>
>    I'm running a small YARN cluster configured to use simple security,
> LinuxContainerExecutor and
>
>
> yarn.nodemanager.linux-container-executor.nonsecure-mode.limit-users=false
>
>    in order to get correct uid when executing jobs. This is needed to
> access files from network exported filesystem.
>
>    I was wondering - does this posses any security risk (since
> nonsecure-mode.limit is set to true by default in the simple security
> mode)? I.e. is there a known way for a user to get uid of different user
> with such configuration?
>
>    Cheers,
>      Tomasz
>
>
>


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