一、安装前准备

查看数据库版本命令： mysql --version

mysql-community-common-8.0.17-1.el7.x86_64.rpm
mysql-community-libs-8.0.17-1.el7.x86_64.rpm
mysql-community-client-8.0.17-1.el7.x86_64.rpm
mysql-community-server-8.0.17-1.el7.x86_64.rpm

二、安装RPM包

依次安装上述RPM包，前后安装包为依赖关系。

# rpm -ivh mysql-community-common-8.0.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-libs-8.0.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-client-8.0.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-server-8.0.17-1.el7.x86_64.rpm

三、 查询root账户初始密码

mysql 8.0版本的初始密码默认非空，安装时自动生成，存储在/var/log/mysqld.logzhon中。

# rpm -ivh mysql-community-common-8.0.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-libs-8.0.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-client-8.0.17-1.el7.x86_64.rpm
# rpm -ivh mysql-community-server-8.0.17-1.el7.x86_64.rpm

四、修改root密码

修改密码默认有安全性要求，对密码复杂度有控制。

mysql> alter user 'root'@'localhost' identified by 'redhat';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> alter user 'root'@'localhost' identified by '1qaz!QAZ';
Query OK, 0 rows affected (0.15 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.01 sec)

五、查看当前用户配置信息

mysql> show databases;
mysql> use mysql;
mysql> select user,host,plugin from user;

六、新建一用户用于远程访问

mysql> create user 'wangwang'@'%' identified by '1qaz!QAZ';
Query OK, 0 rows affected (0.08 sec)
mysql> grant all on *.* to 'wangwang'@'%';
Query OK, 0 rows affected (0.12 sec)
mysql> select user,host,plugin from user;

该账户的plugin加密方式为caching_sha2_password， MySQL 8.0前的客户端在连接 MySQL 8.0服务器时会出现 Authentication plugin 'caching_sha2_password' cannot be loaded 的错误（需要更该为mysql_native_password）。

七、修改加密方式

修改加密规则

mysql> alter user 'wangwang'@'%' identified by '1qaz!QAZ' password expire never; 
Query OK, 0 rows affected (0.17 sec)

更新用户密码

mysql> alter user 'wangwang'@'%' identified with mysql_native_password by '1qaz!QAZ';
Query OK, 0 rows affected (0.04 sec)

保存更改

mysql> flush privileges;
Query OK, 0 rows affected (0.05 sec)

查询信息

mysql> select user,host,plugin from user;