When I tried to create an user for application instead of giving out the master user and its password. I got "Error Code: 1045. Access denied for user 'mysqladmin'@'%' (using password: YES)" when I run "GRANT ALL PRIVILEGES ON demodb.* TO 'appadmin'@'%';". I tried the method in How do I create another master user for my Amazon RDS DB instance that is running MySQL?, it is for creating another master user with more permissions than an app db user.