2) Setting Up a New User for MySQL 
With MySQL installed and ready to store information, all that's left is to get the server running on your computer. While you can run the server as the root user, or even as yourself (if, for example, you installed the server in your own home directory), the best idea is to set up a special user on the system that can do nothing but run the MySQL server. This will remove any possibility of someone using the MySQL server as a way to break into the rest of your system. To create a special MySQL user, you'll need to log in as root and type the following commands:
/usr/sbin/groupadd mysqlgrp
/usr/sbin/useradd -g mysqlgrp mysqlusr
By default, MySQL stores all database information in the var subdirectory of the directory to which it was installed. We want to make it so that nobody can access that directory except our new MySQL user. The following commands will do this (I'm assuming you installed MySQL to the /usr/local/mysql directory):
cd /usr/local/mysql
chown -R mysqlusr.mysqlgrp var
chmod -R go-rwx var
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