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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-6456) Allow administrators to set a single ContainerRuntime for all containers
Date Thu, 27 Sep 2018 18:10:00 GMT

    [ https://issues.apache.org/jira/browse/YARN-6456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16630838#comment-16630838
] 

Eric Yang commented on YARN-6456:
---------------------------------

The title doesn't match the implementation though.  The implementation is allowing more than
one runtime, and set one, if it is not explicitly defined.  Where the title says to enforce
all container to run with one runtime.  The feature requested by the title can be accomplished
by using existing yarn.nodemanager.runtime.linux.allowed-runtimes setting and set it to one
runtime without code change.  Do we want to change the title to reflect the implementation
for correctness?


> Allow administrators to set a single ContainerRuntime for all containers
> ------------------------------------------------------------------------
>
>                 Key: YARN-6456
>                 URL: https://issues.apache.org/jira/browse/YARN-6456
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager
>            Reporter: Miklos Szegedi
>            Assignee: Craig Condit
>            Priority: Major
>              Labels: Docker
>         Attachments: YARN-6456-ForceDockerRuntimeIfSupported.patch, YARN-6456.001.patch,
YARN-6456.002.patch, YARN-6456.003.patch, YARN-6456.004.patch, YARN-6456.005.patch
>
>
>  
> With LCE, there are multiple ContainerRuntimes available for handling different types
of containers; default, docker, java sandbox. Admins should have the ability to override the
user decision and set a single global ContainerRuntime to be used for all containers.
> Original Description:
> {quote}One reason to use Docker containers is to be able to isolate different workloads,
even, if they run as the same user.
> I have noticed some issues in the current design:
>  1. DockerLinuxContainerRuntime mounts containerLocalDirs {{nm-local-dir/usercache/user/appcache/application_1491598755372_0011/}}
and userLocalDirs {{nm-local-dir/usercache/user/}}, so that a container can see and modify
the files of another container. I think the application file cache directory should be enough
for the container to run in most of the cases.
>  2. The whole cgroups directory is mounted. Would the container directory be enough?
>  3. There is no way to enforce exclusive use of Docker for all containers. There should
be an option that it is not the user but the admin that requires to use Docker.
> {quote}



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