I am doing an install of a mysql system, and decided that I needed to change some things like host name. So I have to go back to square one with the mysql setup, but can't find any instructions for this. I TRIED: mysql_install_db And it did SOMETHING, but mysqladmin -u root password 'mypass' failed with: mysqladmin: connect to server at 'localhost' failed error: 'Access denied for user 'root'@'localhost' (using password: NO)' I tried 'yum reinstall mysql' and that did not help.