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From "Miklos Szegedi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-7506) Overhaul the design of the Linux container-executor regarding Docker and future runtimes
Date Wed, 15 Nov 2017 23:11:00 GMT
Miklos Szegedi created YARN-7506:
------------------------------------

             Summary: Overhaul the design of the Linux container-executor regarding Docker
and future runtimes
                 Key: YARN-7506
                 URL: https://issues.apache.org/jira/browse/YARN-7506
             Project: Hadoop YARN
          Issue Type: Wish
          Components: nodemanager
            Reporter: Miklos Szegedi


I raise this topic to discuss a potential improvement of the container executor tool in node
manager.
container-executor has two main purposes. It executes Linux *system calls not available from
Java*, and it executes tasks *available to root that are not available to the yarn user*.
Historically container-executor did both by doing impersonation. The yarn user is separated
from root because it runs network services, so *the yarn user should be restricted* by design.
Because of this it has it's own config file container-executor.cfg writable by root only that
specifies what actions are allowed for the yarn user. However, the requirements have changed
with Docker and that raises the following questions:

1. The Docker feature of YARN requires root permissions to *access the Docker socket* but
it does not run any system calls, so could the Docker related code in container-executor be
*refactored into a separate Java process ran as root*? Java would make the development much
faster and more secure. 

2. The Docker feature only needs the Docker unix socket. It is not a good idea to let the
yarn user directly access the socket, since that would elevate its privileges to root. However,
the Java tool running as root mentioned in the previous question could act as a *proxy on
the Docker socket* operating directly on the Docker REST API *eliminating the need to use
the Docker CLI*. 



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