Does it makes sense to use Knox (+LDAP) as authentication proxy to application that is not using Hadoop at all?
I'm new to this domain and have heard about such possibility but I don't quite get it. Maybe there are some viable alternatives?
Absolutely ! you can use Apache Knox without Hadoop. I use it to secure my Raspberry Pi Motion setup, this is a link to the blog post (it is still work in progress but you'll get an idea) Securing Raspberry Pi Security Camera (or UIs) using Apache Knox