Linux下mysql的root密碼丟失重置

[root@12c ~]# service mysqld stop

停止 mysqld：                                              [確定]

方法一，直接改配置檔案修改/etc/my.cnf 增加skip-grant-tables引數啟動如下。5.7版本下使用root 還需要j加入explicit_defaults_for_timestamp=true

[mysqld]

datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
skip-grant-tables
#explicit_defaults_for_timestamp=true

方法二，啟動時用命令啟動，記得保留這個視窗

[root@12c ~]# /etc/init.d/mysqld start --skip-grant-tables

正在啟動 mysqld：                                          [確定]

重啟動乙個命令視窗，為了區別，這裡注意使用者已經不是root了

[oracle@12c ~]$ mysql -uroot 

welcome to the mysql monitor.  commands end with ; or \g.
your mysql connection id is 1
server version: 5.1.73 source distribution
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> show databases;
+--------------------+
| database           |
+--------------------+
| information_schema |
| mysql              |
| test               |
| zebra              |
+--------------------+
4 rows in set (0.00 sec)

方式一5.6：

mysql> update mysql.user set password=password('mysql') where user='root';

query ok, 0 rows affected (0.00 sec)
rows matched: 3  changed: 0  warnings: 0

mysql> update mysql.user set authentication_string=password('mysql') where user='root';

query ok, 1 row affected, 1 warning (0.03 sec)
rows matched: 1  changed: 1  warnings: 1

方式二：

mysql> set password for root@localhost=password('mysql');

error 1290 (hy000): the mysql server is running with the --skip-grant-tables option so it cannot execute this statement

mysql> flush privileges;

query ok, 0 rows affected (0.01 sec)

[root@12c ~]# service mysqld stop

停止 mysqld：                                              [確定]
[root@12c ~]# service mysqld start
正在啟動 mysqld：                                          [確定]
[root@12c ~]# mysql -uroot -p
enter password: 
welcome to the mysql monitor.  commands end with ; or \g.
your mysql connection id is 2
server version: 5.1.73 source distribution
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> show databases;
+--------------------+
| database           |
+--------------------+
| information_schema |
| mysql              |
| test               |
| zebra              |
+--------------------+
4 rows in set (0.00 sec)
mysql>

mysql> alter user 'root'@'localhost' identified by 'youpassword';

修改完畢。

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