wget -i http://dev.mysql.com/get/mysql57-community-release-el7-7.noarch.rpm

yum -y install mysql57-community-release-el7-7.noarch.rpm

yum -y install mysql-community-server

systemctl start  mysqld.service

使用YUM安装并启动MySQL服务后，MySQL进程会自动在进程日志中打印root用户的初始密码：

[root@typecodes ~]# mysql -uroot -p

Enter password:             #######输入默认的root密码后回车

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 2

Server version: 5.7.10

Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new password';

Query OK, 0 rows affected (0.00 sec)

mysql> exit

Bye