mysql 配置檔案目錄：/etc/my.cnf

root 密碼為空的時候配置檔案中下面這句：

GRANT ALL PRIVILEGES ON *.* TO IDENTIFIED BY '123' WITH GRANT OPTION;

執行這句時候錯誤：

這個時候我們只需要

一下，在新增使用者就OK了，

mysql> flush privileges; Query OK, 0 rows affected (0.01 sec)

mysql> GRANT ALL PRIVILEGES ON *.* TO IDENTIFIED BY '123' WITH GRANT OPTION; Query OK, 0 rows affected (0.00 sec)

這個時候我們成功搞定了，再登入就可以了。

如果報錯如下資訊：

Error: Cannot retrieve repository metadata (repomd.xml) for repository: InstallMedia. Please verify its path and try again  You could try using --skip-broken to work around the problem  You could try running: rpm -Va --nofiles --nodigest

我們只要到/etc/yum.repo.s下面把packetxxxx.repo和redhat.repo兩個檔案刪除掉，再啟動就可以了，