將mysql開放，使得能被外部連接

mysql -u root -p

use mysql
設置密碼永遠不會過期，記住這個時候還是隻能本地連接，並不能外部連接，
ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;
設置所有地址都可以訪問mysql
update user set host='%' where user ='root';

update user set plugin='mysql_native_password' where user ='root';
授於所有權限
grant all on *.* to 'root'@'%';

flush privileges;

重啓mysql