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MongoDB

https://stackoverflow.com/questions/4881208/
https://docs.mongodb.org/v3.0/tutorial/add-user-administrator/
https://docs.mongodb.com/manual/tutorial/enable-authentication/

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Setting up

To set port (default is 27017) and limit to localhost 
    vi /etc/mongodb.conf
      net:
        port: 27017
        bindIp: 127.0.0.1  # Listen to local interface only
        # bindIp: 127.0.0.1,10.0.0.200  # bind to local and intranet IP's

To enable authentication (just root access)
  Configure
    vi /etc/init.d/mongodb
      :" add "--auth" to the daemon start arguments
      :" also ensure --config is set for shutdown

  Set up
    mongo
      use admin;
      db.addUser('admin_user', '12345');
      db.getUser("admin_user")
      db.changeUserPassword("admin_user", "new_password")
      exit
    service mongodb restart

  Testing
    mongo
      show databases;
      db.auth('admin_user','12345');
      show databases;
      exit
  OR
    mongo -u "admin_user" -p "12345"
      show databases;

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