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https://issues.apache.org/jira/browse/YARN-2466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14286402#comment-14286402
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Chen He commented on YARN-2466:
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Another idea for DCE.
If we want to use DCE in production, another problem is the docker image
update. If a job need an updated version of docker image for running container,
we have to update docker image before we start the job. It may take time to
pull from registry and apply changes. It will be good if DCE can check registry
and download it (the one that this job needed, could be specified through conf
or CLI ) before starting the container.
> Umbrella issue for Yarn launched Docker Containers
> --------------------------------------------------
>
> Key: YARN-2466
> URL: https://issues.apache.org/jira/browse/YARN-2466
> Project: Hadoop YARN
> Issue Type: New Feature
> Affects Versions: 2.4.1
> Reporter: Abin Shahab
> Assignee: Abin Shahab
>
> Docker (https://www.docker.io/) is, increasingly, a very popular container
> technology.
> In context of YARN, the support for Docker will provide a very elegant
> solution to allow applications to package their software into a Docker
> container (entire Linux file system incl. custom versions of perl, python
> etc.) and use it as a blueprint to launch all their YARN containers with
> requisite software environment. This provides both consistency (all YARN
> containers will have the same software environment) and isolation (no
> interference with whatever is installed on the physical machine).
> In addition to software isolation mentioned above, Docker containers will
> provide resource, network, and user-namespace isolation.
> Docker provides resource isolation through cgroups, similar to
> LinuxContainerExecutor. This prevents one job from taking other jobs
> resource(memory and CPU) on the same hadoop cluster.
> User-namespace isolation will ensure that the root on the container is mapped
> an unprivileged user on the host. This is currently being added to Docker.
> Network isolation will ensure that one user’s network traffic is completely
> isolated from another user’s network traffic.
> Last but not the least, the interaction of Docker and Kerberos will have to
> be worked out. These Docker containers must work in a secure hadoop
> environment.
> Additional details are here:
> https://wiki.apache.org/hadoop/dineshs/IsolatingYarnAppsInDockerContainers
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