Miklos Szegedi created YARN-6456:
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             Summary: Isolation of Docker containers In LinuxContainerExecutor
                 Key: YARN-6456
                 URL: https://issues.apache.org/jira/browse/YARN-6456
             Project: Hadoop YARN
          Issue Type: Bug
          Components: nodemanager
            Reporter: Miklos Szegedi


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.




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