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Here is what the Hydra-in-a-Box technical team is currently using for our instance of Hyku deployed in AWS. We offer this information as a reference point, not as a recipe or a recommendation. 
Where is more information about Hydra-in-a-Box and Hyku?
Visit the Hydra-in-a-Box website which features an FAQ of its own, a blog, and links to more project documentation.
A website for HykuDirect is now in planning and will be released in June.