I am using AWS EC2 (Ubuntu). There are many users in the system & they have applications which uses mongodb. Now I have to use the same mongodb but different db by keeping authentication (only for that specific DB), so that other users can use their db's but they cannot see mine. How can I achieve this?

I did try these but didn't work

1. docs.mongodb.com/manual/reference/method/db.creat…
2. medium.com/@raj_adroit/mongodb-enable-authenticat…