brew install mysql on macOS

I'm trying to setup up MySQL on mac os 10.6 using Homebrew by `brew install mysql 5.1.52`. Everything goes well and I am also successful with the `mysql_install_db`. However when I try to connect to the server using: /usr/local/Cellar/mysql/5.1.52/bin/mysqladmin -u root password 'mypass' I get: <pre> /usr/local/Cellar/mysql/5.1.52/bin/mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'root'@'localhost' (using password: NO)'</pre> I've tried to access `mysqladmin or mysql using -u root -proot` as well, but it doesn't work with or without password. This is a brand new installation on a brand new machine and as far as I know the new installation must be accessible without a root password. I also tried: /usr/local/Cellar/mysql/5.1.52/bin/mysql_secure_installation but I also get <pre> ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)</pre>