MySQL 8.0 以上版本重置 root 用戶密碼

MySQL 8.0 以上版本重置 root 用戶密碼

1. 在 /etc/my.cnf 文件末尾追加 skip-grant-tables

   [root@abdefg mysql]# vim /etc/my.cnf
    [mysql]
    # 設置mysql客戶端默認字符集
    default-character-set=utf8mb4 
   
    [mysqld]
    # 設置3306端口
    port = 3306 
    # 設置mysql的安裝目錄
    basedir=/usr/local/mysql
    # 設置mysql數據庫的數據的存放目錄
    datadir=/usr/local/mysql/data
    # 容許最大鏈接數
    max_connections=200
    # 服務端默認編碼（數據庫級別）
    character-set-server=utf8mb4
    # 建立新表時將使用的默認存儲引擎
    default-storage-engine=INNODB 
    lower_case_table_names=1
    max_allowed_packet=16M
    skip-grant-tables

2. 重啓MySQL服務

   [root@abdefg mysql]# service mysqld restart

3. 免密碼登陸 root 用戶（輸入密碼時直接回車便可）

   [root@abdefg bin]# mysql -uroot -p
    Enter password: 
    Welcome to the MySQL monitor.  Commands end with ; or \g.
    Your MySQL connection id is 8
    Server version: 8.0.13 MySQL Community Server - GPL
   
    Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
   
    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.
   
    Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
   
    mysql>

4. 重置密碼

   mysql> use mysql

   查詢一下

   mysql> select host, user, authentication_string, plugin from user;

   執行修改報錯

   mysql> alter user 'root'@'localhost'IDENTIFIED BY 'newpassword[@123](https://my.oschina.net/u/9520)';
    ERROR 1290 (HY000): The MySQL server is running with the --skip-grant-tables option so it cannot execute this statement

   先執行flush privileges;而後會alter成功，要否則會alter失敗

   mysql> flush privileges;
    Query OK, 0 rows affected (0.00 sec)
   
    mysql> alter user 'root'@'localhost'IDENTIFIED BY 'newpassword[@123](https://my.oschina.net/u/9520)';
    Query OK, 0 rows affected (0.03 sec)
   
    mysql> exit
    Bye

5. 把/etc/my.cnf 文件末尾的 skip-grant-tables 去掉，重啓MySQL服務，修改完成

參考文檔：網絡螞蟻 奧斯維克雞腿學徒