yum安装MySQL8

yum仓库

yum localinstall https://repo.mysql.com//mysql80-community-release-el8-2.noarch.rpm

或者

wget -i -c https://dev.mysql.com/get/mysql80-community-release-el8-2.noarch.rpm
yum -y install mysql80-community-release-el8-2.noarch.rpm

yum安装MySQL

yum -y install mysql-community-server

如果提示以下错误

Last metadata expiration check: 0:02:05 ago on Thu 18 Nov 2021 08:19:27 PM CST.
All matches were filtered out by modular filtering for argument: mysql-community-server
Error: Unable to find a match: mysql-community-server

需执行

yum module disable mysql

然后重新install

启动MySQL服务：systemctl start mysqld.service
查看MySQL服务：systemctl status mysqld.service

此时如果要进入MySQL得找出root用户的密码，输入命令

grep "password" /var/log/mysqld.log
w&Qsi4IDu9e1

得到密码后，登录mysql，修改密码

# 登录MySQL
mysql -uroot -p
# 修改root密码
ALTER USER 'root'@'localhost' IDENTIFIED BY '5LNKrDtHsR7$';

创建用户

创建用户：CREATE USER 'admin'@'%' IDENTIFIED BY '5LNKrDtHsR7$';
允许远程连接：GRANT ALL ON *.* TO 'testdb'@'%';
本人测试过，使用 update user set host = '%' where user = 'root'; 也可以修改

用户分配权限

--授予用户通过外网IP对于该数据库“testdb”的全部权限

grant all privileges on testdb.* to 'admin'@'%' identified by '5LNKrDtHsR7$';  

MySQL8提示

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

需要使用下面这种语法

grant all privileges on spy_fb.* to 'facebook'@'%' ;
grant all privileges on spy_logs.* to 'facebook'@'%' ;
grant all privileges on spy_task.* to 'facebook'@'%' ;

# 刷新权限
flush privileges; 

如果使用客户端连接提示了plugin caching_sha2_password错误，这是因为MySQL8.0的密码策略默认为caching_sha2_password
使用命令修改策略
ALTER USER 'facebook'@'%' IDENTIFIED WITH mysql_native_password BY 'J5LNKrJ7DtHknsR7$';