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

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

修改用户密码

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

如果提示错误:ERROR 1396 (HY000): Operation ALTER USER failed for 'root'@'localhost'则需要改用命令:

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('5LNKrDtHsR7$');

授权外网访问

授权所有数据库权限：GRANT ALL ON *.* TO 'root'@'%';本人测试过，使用 update user set host = '%' where user = 'root'; 也可以修改

创建其他账号

1. 创建用户

创建用户：CREATE USER 'admin'@'%' IDENTIFIED BY '5LNKrDtHsR7$';

2. 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 testdb.* to 'admin'@'%' ;

# 刷新权限
flush privileges; 

其它问题

caching_sha2_password错误解决方案

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$';

降低密码安全策略

如果想设置密码为123456, 需要降低密码安全性策略

set global validate_password_policy=LOW
set global validate_password_length=6
alter user user() identified by '123456'
flush  privileges