MySQL5.7的默认根密码是什么

Question

新安装后不能像其他旧版本的MySQL那样使用root ID和空/无密码登录MySQL数据库

Answer 1

有那么多的答案说要重新安装mysql，或者使用

mysqld_safe --skip-grant-tables

和/或

UPDATE mysql.user SET Password=PASSWORD('password')

…这些对我都没用

在Ubuntu 18.04上，以下是对我起作用的方法

特别感谢这个答案把我从这件事的沮丧中挖了出来...

$ sudo apt install mysql-server
$ sudo cat /etc/mysql/debian.cnf

请注意以下行：

user     = debian-sys-maint
password = blahblahblah

然后：

$ mysql -u debian-sys-maint -p
Enter password: // type 'blahblahblah', ie. password from debian.cnf

mysql> USE mysql
mysql> SELECT User, Host, plugin FROM mysql.user;
+------------------+-----------+-----------------------+
| User             | Host      | plugin                |
+------------------+-----------+-----------------------+
| root             | localhost | auth_socket           |
| mysql.session    | localhost | mysql_native_password |
| mysql.sys        | localhost | mysql_native_password |
| debian-sys-maint | localhost | mysql_native_password |
+------------------+-----------+-----------------------+
4 rows in set (0.00 sec)

mysql> UPDATE user SET plugin='mysql_native_password' WHERE User='root';
mysql> COMMIT;  // When you don't have auto-commit switched on

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'new_password';

或：

// For MySQL 5.7+
UPDATE mysql.user SET authentication_string=PASSWORD('new_password') where user='root';

然后：

mysql> FLUSH PRIVILEGES;
mysql> COMMIT;  // When you don't have auto-commit switched on
mysql> EXIT

$ sudo service mysql restart
$ mysql -u root -p
Enter password: // Yay! 'new_password' now works!