Hi All, I am new on Ambari. I use Rhel7 and i installed Ambari server and have been configured it succefully on my server. So, i want to install Airflow on this existing ambari server. I've tried to install it with the command  "ambari-server install-mpack --mpack=/opt/airflow-service-mpack.tar.gz" and i got this python message :  Using python /usr/bin/python Usage: {start|stop|restart|setup|setup-jce|upgrade|status|upgradestack|setup-ldap|sync-ldap|set-current|setup-security|setup-sso|refresh-stack-hash|backup|restore|update-host-names|check-database|db-cleanup|enable-stack} [options] Use --help to get details on options available. Or, simply invoke ambari-server.py --help to print the options.   Need help Please.   Thanks,   Math ... View more