忘记密码mysql 8.2重置root密码linux

重置密码

1.找到support-files下的服务

# 查找mysql位置
which mysql
#/usr/local/bin/mysql
# 查找原始位置
ls -al /usr/local/bin | grep mysql
# 进入原始的为值找到support-files文件夹
# 注意路径要全,我这里是macos系统就是Cellar下
cd /usr/local/Cellar/mysql/8.2.0_1/support-files
# 停止之前的服务，2选1
sudo mysql.server stop # MacOS命令
sudo service mysql stop # Linux命令
# 运行mysql服务 跳过密码验证,记得sudo
sudo ./mysql.server --skip-grant-tables
# 无密码登录
mysql -u root
# 删除密码,刷新，退出
mysql> UPDATE mysql.user SET authentication_string=null WHERE User='root';
mysql> flush privileges; 
mysql> exit

# 重新登录
mysql -u root

3.修改密码
注意密码复杂度需要根据验证等级设置，后面附查看方法
默认中等：>=8位,大写字母+小写字母+特殊字符

mysql>ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'Chris999000...';
mysql>flush privileges;
mysql>exit;

验证是否修改成功

# macos 操作
sudo mysql.server stop
## 正常启动
sudo mysql.server start
----------------------------------------
## linux下操作
sudo service mysql stop
sudo service mysql start
mysql -u root -p
# 输入新的密码
查看密码等级信息
# 输入这个命令
mysql> SHOW VARIABLES LIKE 'validate_password%';

#显示结果
+-------------------------------------------------+--------+
| Variable_name                                   | Value  |
+-------------------------------------------------+--------+
| validate_password.changed_characters_percentage | 0      |
| validate_password.check_user_name               | ON     |
| validate_password.dictionary_file               |        |
| validate_password.length                        | 8      |
| validate_password.mixed_case_count              | 1      |
| validate_password.number_count                  | 1      |
| validate_password.policy                        | MEDIUM |
| validate_password.special_char_count            | 1      |
+-------------------------------------------------+--------+
8 rows in set (0.02 sec)

Fix - MySQL ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
There are three levels of password validation policy enforced when Validate Password plugin is enabled:

LOW Length >= 8 characters.
MEDIUM Length >= 8, numeric, mixed case, and special characters.
STRONG Length >= 8, numeric, mixed case, special characters and dictionary file.