centos7安装mysql8.x的注意事项，与5.x版本有许多不同

1、多年前写了一篇文章：

centos7安装和卸载mysql5.7.18完整实用教程

https://blog.csdn.net/libaineu2004/article/details/76212125

https://downloads.mysql.com/archives/community/

2、今天安装新版本mysql 8.0.28。整个过程与5.x有不同。

 （1）8.x需要7个软件安装包，如下顺序依次安装

[root@localhost mysql]# rpm -ivh mysql-community-common-8.0.28-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-client-plugins-8.0.28-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-libs-8.0.28-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-client-8.0.28-1.el7.x86_64.rpm

[root@localhost mysql]# rpm -ivh mysql-community-icu-data-files-8.0.28-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-server-8.0.28-1.el7.x86_64.rpm
[root@localhost mysql]# rpm -ivh mysql-community-devel-8.0.28-1.el7.x86_64.rpm

（2）修改root密码
放弃旧方法
mysql> set password for root@localhost = password('Mypwd123456$');
使用新方法
mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Mypwd123456$';

（3）为 root 用户授权 mysql 远程连接服务

放弃旧方法
mysql> grant all privileges on *.* to 'root'@'%' identified by 'Mypwd123456$' with grant option;
mysql> flush privileges;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'identified by 'Mypwd123456$' with grant option' at line 1

使用新方法

mysql> create user 'root'@'%' identified by 'Mypwd123456$';
mysql> grant all privileges on *.* to 'root'@'%';

mysql> use mysql
Database changed
mysql> select user,host from user;
+------------------+-----------+
| user             | host      |
+------------------+-----------+
| mysql.infoschema | localhost |
| mysql.session    | localhost |
| mysql.sys        | localhost |
| root             | localhost |
+------------------+-----------+
4 rows in set (0.00 sec)
 
mysql> create user 'root'@'%' identified by 'Mypwd123456$';
Query OK, 0 rows affected (0.01 sec)
 
mysql> grant all privileges on *.* to 'root'@'%';
Query OK, 0 rows affected (0.00 sec)
 
mysql> exit