MySQL 授权指定ip访问  我超怕的-https://www.cnblogs.com/iAmSoScArEd/p/13632279.html

提前多一次flush privileges一下，是为了防止报错。

1、指定ip

修改下面命令的:

ip（172.16.1.123）

用户名（root）

密码（password）

进行授权

flush privileges;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'172.16.1.123' IDENTIFIED BY 'password' WITH GRANT OPTION;
flush privileges;

2、所有ip

修改 下面命令的用户名（root）、密码（password）进行授权

flush privileges;
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
flush privileges;

取消授权

1、指定IP

flush privileges;
REVOKE ALL PRIVILEGES ON *.* FROM 'root'@'172.16.1.123' IDENTIFIED BY 'password' WITH GRANT OPTION;
flush privileges;

2、取消所有IP授权

flush privileges;
REVOKE ALL PRIVILEGES ON *.* FROM 'root'@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
flush privileges;