How can I install more than one web App on the same Device?
/docs/gears/faq-howto-troubleshooting/howto-many-apps/
You have two choices:
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You can invoke ubos-admin createsiteas many times as you wish and create as many Sites on your Device as you wish, each running one or more Apps.However, every time you invoke ubos-admin createsiteagain, you need to use a different hostname:createsitemeans that you are creating a separate Site every time; the command cannot modify an existing Site.This may be what you want – for example, every family member might have their own Site on your Site. Or, it might not be worth the extra complexity setting up several DNS entries. 
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When you create your first site with ubos-admin createsite, repeatedly specify Apps at different Context Paths of the same Site.
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You can augment an existing Site by adding another App to the same Site, accessible at the same hostname but at different Context Paths . To do that today, you need to obtain the existing Site’s Site JSON file and add another entry to it. This is described in How to modify the configuration of your Site.