protected final String getContainerHostAddress() {
        String hostAddress = System.getenv("HIVE_TEST_DOCKER_HOST");
        if (hostAddress != null) {
            return hostAddress;
        } else {
            return "localhost";
        }
    }
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