mysql 迁移至 8.0 时的注意事项

密码模式

PDO::__construct(): The server requested authentication method unknown to the client [caching_sha2_password]

mysql8 之后，默认的密码模式改为 caching_sha2_password，新的模式需要新的驱动，至少现在 pdo / navicat 还没给出，所以我们还是得切换成老的 mysql_native_password 模式。

`mysql_native_password`：7.0 以下
`caching_sha2_password`：8.0 以上

1、my.cnf 配置默认的密码模式

[mysqld]
default_authentication_plugin=mysql_native_password

2、更新账号的密码模式

# 创建新的账号
create user 'root'@'%' identified with mysql_native_password by '123456';

# 已存在的账号
alter user 'root'@'%' identified with mysql_native_password by '123456';

3、如果你需要授权

# 授权也不能兼并创建账号了，只能授权
grant all privileges on *.* to 'root'@'%' with grant option;
flush privileges;

密码复杂度策略

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

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密码复杂度验证策略导致的，关闭后设定即可

set global validate_password.policy=0;
set global validate_password.length=6;

默认编码

PDO::__construct(): Server sent charset (255) unknown to the client. Please, report to the developers

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设定 mysql 服务的默认编码

# Default Homebrew MySQL server config
[client]
default_character_set=utf8mb4

[mysql]
default_character_set=utf8mb4

[mysqld]
default_authentication_plugin=mysql_native_password
character_set_server=utf8mb4
collation_server=utf8mb4_general_ci

远程访问

1、my.conf 注释掉本地监听

[mysqld]
#bind_address=127.0.0.1

2、更新账号的 host

update mysql.user set host='%' where user='root';