ERROR 1698 (28000): Access denied for user 'root'@'localhost'已解决

ubuntu 16.04 下安装新版mysql,登录时必须sudo mysql -u root -p,因为安装时root用户的密码是随机的,直接mysql -u root -p则无法登录,报错:
ERROR 1698 (28000): Access denied for user 'root'@'localhost
解决方案:

步骤一:登录mysql

  sudo mysql -u root -p

步骤二:查看user表:

select user, plugin from mysql.user;

结果如下:

mysql> select user, plugin from mysql.user;
+-----------+-----------------------+
| user      | plugin                |
+-----------+-----------------------+
| root      | auth_socket           |
| mysql.sys | mysql_native_password |
| dev       | mysql_native_password |
+-----------+-----------------------+
3 rows in set (0.01 sec)

发现root的plugin并不是本地密码,因此需要修改它,但由于MySQL5.6.6版本之后增加了密码强度验证插件validate_password,相关参数设置的较为严格。如果修改的密码太过低级,则无法通过,报如下错误:

ERROR 1819 (HY000): Your password does not satisfy the current policy requirements

因此,如果要设置为简单密码,则需修改密码规则的配置,参考博客:https://blog.csdn.net/kuluzs/article/details/51924374

步骤三:修改mysql参数配置:

set global validate_password_policy=0;
set global validate_password_mixed_case_count=0;
set global validate_password_number_count=3;
set global validate_password_special_char_count=0;
set global validate_password_length=3;

步骤四:修改root密码

update mysql.user set authentication_string=PASSWORD('123'), plugin='mysql_native_password' where user='root';

步骤五:刷新

flush privileges;
``
最后重启终端,就可通过mysql -u root -p 免sudo登录mysql啦!

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