開啟一個ssh

service mysqld stop #關閉mysql
/usr/bin/mysqld_safe --skip-grant-tables & #安全模式

開啟另個ssh

mysql -u root -p
use mysql
select * from user where user='root' and host='localhost';#檢視到root使用者許可權都變成N了。

執行下面的語句

update user set  `Select_priv` = 'Y' where user='root' and host='localhost';
update
 
 user set  `Insert_priv` = 'Y' where user='root' and host='localhost';
update user set  `Update_priv` = 'Y' where user='root' and host='localhost';
update user set  `Delete_priv` = 'Y' where user='root' and host='localhost';
update user set  `Create_priv` = 'Y' where user='root' and host='localhost'
 
;
update user set  `Drop_priv` = 'Y' where user='root' and host='localhost';
update user set  `Reload_priv` = 'Y' where user='root' and host='localhost';
update user set  `Shutdown_priv` = 'Y' where user='root' and host='localhost';
update user set  `Process_priv` = 'Y' where user='root' and host='localhost'
 
;
update user set  `File_priv` = 'Y' where user='root' and host='localhost';
update user set  `Grant_priv` = 'Y' where user='root' and host='localhost';
update user set  `References_priv` = 'Y' where user='root' and host='localhost';
update user set  `Index_priv` = 'Y' where user='root' and host='localhost';
update user set  `Alter_priv` = 'Y' where user='root' and host='localhost';
update user set  `Show_db_priv` = 'Y' where user='root' and host='localhost';
update user set  `Super_priv` = 'Y' where user='root' and host='localhost';
update user set  `Create_tmp_table_priv` = 'Y' where user='root' and host='localhost';
update user set  `Lock_tables_priv` = 'Y' where user='root' and host='localhost';
update user set  `Create_tmp_table_priv` = 'Y' where user='root' and host='localhost';
update user set  `Lock_tables_priv` = 'Y' where user='root' and host='localhost';
update user set  `Execute_priv` = 'Y' where user='root' and host='localhost';
update user set  `Repl_slave_priv` = 'Y' where user='root' and host='localhost';
update user set  `Repl_client_priv` = 'Y' where user='root' and host='localhost';
update user set  `Create_view_priv` = 'Y' where user='root' and host='localhost';
update user set  `Show_view_priv` = 'Y' where user='root' and host='localhost';
update user set  `Create_routine_priv` = 'Y' where user='root' and host='localhost';
update user set  `Alter_routine_priv` = 'Y' where user='root' and host='localhost';
update user set  `Create_user_priv` = 'Y' where user='root' and host='localhost';
update user set  `Event_priv` = 'Y' where user='root' and host='localhost';
update user set  `Trigger_priv` = 'Y' where user='root' and host='localhost';
update user set  `Create_tablespace_priv` = 'Y' where user='root' and host='localhost';

然後執行flush privileges;，讓許可權生效，然後執行命令service mysqld start啟動mysql即可