[jira] [Created] (MESOS-4234) Add tests for running Docker in Docker

["Joseph Wu (JIRA)" <ji...@apache.org>]

Joseph Wu created MESOS-4234:
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             Summary: Add tests for running Docker in Docker
                 Key: MESOS-4234
                 URL: https://issues.apache.org/jira/browse/MESOS-4234
             Project: Mesos
          Issue Type: Improvement
          Components: containerization, docker, test
            Reporter: Joseph Wu


When the Mesos agent is itself running in a Docker container, the Docker containerizer will spawn executors as additional containers (rather than as a subprocess).  This prevents executors from dying if the agent dies.

There are currently no automated tests for this code path, particularly because the test setup is particularly expensive.  A test would need to:
* Create a Docker image.
* Compile Mesos inside the Docker image.
* Spin up agents inside Docker containers.
* Clean up properly.

These tests are currently done manually ([example|https://reviews.apache.org/r/41560/]).  Similar tests should be codified and added as regression tests.



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