# sudo yum install mysql-server

Dependencies Resolved

===========================================================================================================================================================================================================
 Package                                                 Arch                                    Version                                         Repository                                           Size
===========================================================================================================================================================================================================
Removing:
 mysql-community-client                                  x86_64                                  5.7.10-1.el7                                    @mysql57-community                                  109 M
 mysql-community-server                                  x86_64                                  5.7.10-1.el7                                    @mysql57-community                                  652 M

Transaction Summary
===========================================================================================================================================================================================================

# sudo service mysqld start

# ps -ef|grep mysql
mysql     1371     1  0 22:17 ?        00:00:00 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

# sudo mysql_secure_installation
// when password is required, I just type "enter key"

service mysqld stop
mysqld_safe --skip-grant-tables &
mysql --user=root mysql
update user set Password=PASSWORD('new-password') where user='root';
flush privileges;
exit;

$ sudo systemctl start mysqld

$sudo grep 'temporary password' /var/log/mysqld.log

10.744785Z 1 [Note] A temporary password is generated for root@localhost: o!5y,oJGALQa

$ sudo mysql_secure_installation
Securing the MySQL server deployment.

Enter password for user root:

$ mysql -u root -p