如何将root密码设置为null

问题描述：

如何从MySQL命令行客户端将MySQL的root用户的密码更改为null(表示没有密码或'')?

How can I change the password for root user of MySQL to null -- meaning no password or '' -- from the MySQL command line client?

答

您可以通过以下五个简单步骤来恢复MySQL数据库服务器密码.

You can recover MySQL database server password with following five easy steps.

步骤1 :停止MySQL服务器进程.

Step # 1: Stop the MySQL server process.

第2步:使用--skip-grant-tables选项启动MySQL(mysqld)服务器/守护进程，使其不会提示输入密码.

Step # 2: Start the MySQL (mysqld) server/daemon process with the --skip-grant-tables option so that it will not prompt for password.

步骤3 :以root用户身份连接到mysql服务器.

Step # 3: Connect to mysql server as the root user.

步骤4 :设置新的mysql根帐户密码，即重置mysql密码.

Step # 4: Setup new mysql root account password i.e. reset mysql password.

第5步:退出并重新启动MySQL服务器.

Step # 5: Exit and restart the MySQL server.

以下是您需要为每个步骤键入的命令(以root用户身份登录):

Here are commands you need to type for each step (login as the root user):

步骤1 :停止mysql服务

Step # 1 : Stop mysql service

# /etc/init.d/mysql stop

输出:

Stopping MySQL database server: mysqld.

第2步:启动不带密码的MySQL服务器:

Step # 2: Start to MySQL server w/o password:

# mysqld_safe --skip-grant-tables &

输出:

[1] 5988
Starting mysqld daemon with databases from /var/lib/mysql
mysqld_safe[6025]: started

第3步:使用mysql客户端连接到mysql服务器:

Step # 3: Connect to mysql server using mysql client:

# mysql -u root

输出:

Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 1 to server version: 4.1.15-Debian_1-log
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql>

第4步:设置新的MySQL root用户密码

Step # 4: Setup new MySQL root user password

mysql> use mysql;
mysql> update user set password=PASSWORD("NEW-ROOT-PASSWORD") where User='root';
mysql> flush privileges;
mysql> quit

第5步:停止MySQL服务器:

Step # 5: Stop MySQL Server:

# /etc/init.d/mysql stop

输出:

Stopping MySQL database server: mysqld
STOPPING server from pid file /var/run/mysqld/mysqld.pid
mysqld_safe[6186]: ended
[1]+  Done                    mysqld_safe --skip-grant-tables

第6步:启动MySQL服务器并对其进行测试

Step # 6: Start MySQL server and test it

# /etc/init.d/mysql start
# mysql      
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) 
# mysql -u root -p

来源: http://www.cyberciti.biz/tips/recovery-mysql-root-password.html

如何将root密码设置为null

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