[jira] [Created] (BEAM-6020) Rework Docker-inside-Docker for JobServer container

["Maximilian Michels (JIRA)" <ji...@apache.org>]

Maximilian Michels created BEAM-6020:
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             Summary: Rework Docker-inside-Docker for JobServer container
                 Key: BEAM-6020
                 URL: https://issues.apache.org/jira/browse/BEAM-6020
             Project: Beam
          Issue Type: Improvement
          Components: runner-flink
            Reporter: Maximilian Michels


Docker-inside-Docker causes problems with permissions. For example:

{noformat}
Caused by: java.lang.Exception: The user defined 'open()' method caused an exception: java.io.IOException: Cannot run program "docker": error=13, Permission denied
	at org.apache.flink.runtime.operators.BatchTask.run(BatchTask.java:498)
	at org.apache.flink.runtime.operators.BatchTask.invoke(BatchTask.java:368)
	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:712)
	... 1 more
Caused by: org.apache.beam.repackaged.beam_runners_java_fn_execution.com.google.common.util.concurrent.UncheckedExecutionException: java.io.IOException: Cannot run program "docker": error=13, Permission denied
	at org.apache.beam.repackaged.beam_runners_java_fn_execution.com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:4994)

	... 7 more
{noformat}

See discussion:
https://lists.apache.org/thread.html/b2b97efaf1f4a6e283eaf92e05605f10f405e9eb9a9c41896041d0ac@%3Cdev.beam.apache.org%3E 

We could get rid of Docker-inside-Docker entirely. It would be cleaner to start the SDK harness container alongside with JobServer container.

Alternatively, it should be possible to use an image with Docker pre-installed, which should fix the permissions errors which come from mounting the Docker executable of the host.



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