Hi,
You should have an option in VMWare that send a poweroff signal to the system, so that DSS stops gracefully.
https://www.vmware.com/support/ws5/doc/ws_running_poweroff_vs_shutdown.html
If you prefer or have to do it manually, you can login into the virtual machine (should be dataiku / dataiku, check the welcome banner) and then run 'sudo shutdown -h now'.
I hope that helps,
Jeremy
Jeremy, Product Manager at Dataiku