protected void printDockerEvents() {
      try {
        runCmdAndPrintStreams(new String[] { "docker", "events", "--since", "24h", "--until", "0s" }, 3);
      } catch (Exception e) {
        LOG.warn("A problem was encountered while attempting to retrieve Docker events (the system made an analytical"
            + " best effort to list the events to reveal the root cause). No further actions are necessary.", e);
      }
    }
The class is in charge of connecting and populating dockerized databases for qtest.

The database should have at least one root user (admin/superuser) able to modify every aspect of the system. The user
either exists by default when the database starts or must created right after startup.
itests/util/src/main/java/org/apache/hadoop/hive/ql/externalDB/AbstractExternalDB.java