If it's available on your cloud provider, the GeneXus Cloud team can provide you a template for a Unit.
After you create a Unit you need to finish some configurations:
Login to mysql with user root and password gxcloud123 (root user is only accesible from localhost, but is recomended you change that password) and run:
grant all privileges on *.* to 'gxcloud'@'%' identified by 'clave-mysql' with grant option; (change clave-mysql with a password)
Change admin and tomcat passwords with new ones:
And restart tomcatgxcloud with: service tomcatgxcloud restart
Do the same but with /opt/tomcatproduction/conf/tomcat-users.xml