When using Docker 1.6 or earlier, the error "flag provided but not defined: --user" is thrown when the plugin tries to run "docker exec ...". This flag is only supported in later versions of Docker but the message isn't clear.
      It would be nice to have the plugin check the version of Docker it requires.

          [JENKINS-30919] Check Docker version

            jonhermansen Jon Hermansen
            mausch Mauricio Scheffer
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              Created:
              Updated: