alt + p -------> put d:/setup/mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar

mkdir mysql
    
tar -xvf mysql-5.7.27-1.el7.x86_64.rpm-bundle.tar -C /home/mysql/

cd mysql/
    
rpm -ivh mysql-community-client-5.7.27-1.el7.x86_64.rpm --force --nodeps

rpm -ivh mysql-community-server-5.7.27-1.el7.x86_64.rpm --force --nodeps

vi /etc/my.cnf
    
    添加如下内容：
    
    [mysqld]
    character-set-server=utf8
    collation-server=utf8_general_ci
 
    -- 在文件最下方添加
    
    [client]
    default-character-set=utf8

service mysqld start

mysql -u root -p  敲回车，输入密码
    
    初始密码查看：cat /var/log/mysqld.log
    
    在root@localhost:   后面的就是初始密码

set global validate_password_policy=0;
    
set global validate_password_length=1;
    
set password=password(‘密码‘);

//授权
    grant all privileges on *.* to ‘root‘ @‘%‘ identified by ‘密码‘;
    
//刷新
    flush privileges;

systemctl stop firewalld

service mysqld restart