1.先停止数据库服务器

service mysqld stop

2.vim /etc/my.cnf

3.配置文件添加skip-grant-tables

[root@VM_0_8_centos ~]# vim /etc/my.cnf# For advice on how to change settings please see# http://dev.mysql.com/doc/refman/5.6/en/server-configuration-defaults.html[mysqld]## Remove leading # and set to the amount of RAM for the most important data# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.# innodb_buffer_pool_size = 128M## Remove leading # to turn on a very important data integrity option: logging# changes to the binary log between backups.# log_bin## Remove leading # to set options mainly useful for reporting servers.# The server defaults are faster for transactions and fast SELECTs.# Adjust sizes as needed, experiment to find the optimal values.# join_buffer_size = 128M# sort_buffer_size = 2M# read_rnd_buffer_size = 2Mdatadir=/var/lib/mysqlsocket=/var/lib/mysql/mysql.sockskip-grant-tables此处！！！！！！# Disabling symbolic-links is recommended to prevent assorted security riskssymbolic-links=0

4.重启数据库

systemctl restart mysql

5.登录数据库

mysql -uroot -p

如果询问密码，直接空密码登录

6.set password for root@localhost = password('123456');括号里面的密码你自己修改。

7.mysql -uroot -p123456 登录成功

PS：下面看下Mysql初始化root密码和允许远程访问

mysql默认root用户没有密码，输入mysql –u root 进入mysql

1、初始化root密码

进入mysql数据库

mysql>update user set password=PASSWORD(‘123456') where User='root';

2、允许mysql远程访问,可以使用以下三种方式:

a、改表。

mysql -u root –pmysql>use mysql;mysql>update user set host = '%' where user = 'root';mysql>select host, user from user;

b、授权。

例如，你想root使用123456从任何主机连接到mysql服务器。

mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '123456' WITH GRANT OPTION;

如果你想允许用户jack从ip为10.10.50.127的主机连接到mysql服务器，并使用654321作为密码

mysql>GRANT ALL PRIVILEGES ON *.* TO 'jack'@'10.10.50.127' IDENTIFIED BY '654321' WITH GRANT OPTION;mysql>FLUSH RIVILEGES

c:在安装mysql的机器上运行：

//进入MySQL服务器d:\mysql\bin\>mysql -h localhost -u root//赋予任何主机访问数据的权限mysql>GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION//使修改生效mysql>FLUSH PRIVILEGES//退出MySQL服务器mysql>EXIT