On some distributions, MySQL is installed without asking you to set the default root password for the MySQL server. If you’re running Debian or Ubuntu, the MySQL install will prompt you to create your password. However, some distributions such as CentOS aren’t as friendly. When MySQL is first installed on CentOS, it finishes without any user interaction. In fact, it finishes without a set root password, without starting the MySQL service, and without configuring the MySQL service to start on system reboot/boot.