關於 Linux 下 root 登陸 MySQL 報錯的問題

最近在centOS 7上，經過yum安裝了mysql，安裝成功後，使用root登陸，出現了以下報錯：

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

mysql版本爲：Ver 14.14 Distrib 5.7.10, for Linux(X86_64) using EditLine wrapper

然而實際上並無進行過root密碼設置(不知道是否是安裝過程有被忽略的地方？)。

對此就各類尋找答案，大體有下面一些狀況：

1. 有說root的隨機密碼位於/root/.mysql_secret中，可是我根本沒有/root/.mysql_secret文件。有文章表示

   > ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using
   > password: NO) :表示沒有生成root的臨時密碼
   > 
   > ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using
   > password: YES) :表示生成了root的臨時密碼。

2. 有些資料說root的默認密碼爲空，通過確認那是之前的老版本，Mysql 5.6及之後版本出處於安全考慮，root密碼已經不爲空了。

最終找到對我來講有用的解決方案。

產生緣由：

Now that the password MySQL had generated is expired, the problem is reduced to getting this password to work again (1) or generate a new one (2). This can be accomplished by running MySQL with the skip-grant-tables option which would make it ignore the access rights:

解決方法：

1. Stop your MySQL server.

2. Add skip-grant-tables at the end of the [mysqld] section of my.cnf file and save it.

3. Start MySQL server.

4. In terminal, typemysql -u root -pto get into MySQL command prompt.

5. In the command prompt, typeUSE mysql;to get into the mysql database where it keeps database users.

6. Type

   UPDATE user SET password_expired = 'N' WHERE User = 'root';

   to let MySQL know the password is not expired (1) or

   UPDATE user SET authentication_string = PASSWORD('YourNewPassword'), password_expired = 'N' WHERE User = 'root';

附上連接：Unable to access MySQL after it automatically generated a temporary password

發佈出來，供你們參考。