linux下mysql的root密码忘记解决方

1．首先确认服务器出于安全的状态，也就是没有人能够任意地连接MySQL数据库。
因为在重新设置MySQL的root密码的期间，MySQL数据库完全出于没有密码保护的
状态下，其他的用户也可以任意地登录和修改MySQL的信息。可以采用将MySQL对
外的端口封闭，并且停止Apache以及所有的用户进程的方法实现服务器的准安全
状态。最安全的状态是到服务器的Console上面操作，并且拔掉网线。

issues: Another MySQL daemon already running with the same unix socket.

mv /var/lib/mysql/mysql.sock /var/lib/mysql/mysql.sock.bak

service mysqld start
2．修改MySQL的登录设置：
# vi /etc/my.cnf
在[mysqld]的段中加上一句：skip-grant-tables
例如：
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-grant-tables
保存并且退出vi。
3．重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]
4．登录并修改MySQL的root密码
# /usr/bin/mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 3 to server version: 3.23.56
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql> USE mysql ;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
设置root密码：

mysql> use mysql
Database changed
mysql> update user set password=password('root') where user='root';
Query OK, 0 rows affected (0.15 sec)
Rows matched: 5  Changed: 0  Warnings: 0
 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

退出，重新登陆即可使用新的密码登陆；

5. 设置远程登陆：

使用root登陆到mysql后

mysql> update user set host='%' where user='root';
ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY'
mysql> select host,user from user;
+-----------------------+------+
| host                  | user |
+-----------------------+------+
| %                    | root |
| 127.0.0.1            | root |
| 192.168.128.142      | root |
| ::1                  | root |
| localhost.localdomain | root |
+-----------------------+------+
5 rows in set (0.00 sec)

然后：

mysql> grant all privileges on *.* to 'root'@'%' with grant option;
Query OK, 0 rows affected (0.08 sec)
 
mysql> exit
5．将MySQL的登录设置修改回来
# vi /etc/my.cnf
将刚才在[mysqld]的段中加上的skip-grant-tables删除
保存并且退出vi。
6．重新启动mysqld
# /etc/init.d/mysqld restart
Stopping MySQL: [ OK ]
Starting MySQL: [ OK ]

Work for fun,Live for love!

 

mysqld_safe --skip-grant-tables &

 

update user set host = '%' where user = 'root';
select host, user from user;

flush privileges;

 

 

1、在[client]字段里加入 default - character - set =utf8，如下：

[client]
port = 3306
socket = /var/lib/mysql/mysql.sock
default - character - set =utf8

2、在[mysqld]字段里加入 character - set -server=utf8，如下：

[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
character - set -server=utf8

3、在[mysql]字段里加入 default - character - set =utf8，如下：

[mysql]
no -auto-rehash
default - character - set =utf8

cat /root/.mysql_

 set password=password('root');