linux下修改mysql登录密码

一、修改mysql密码
1.停止服务
/etc/init.d/mysqld stop

2.以不检查权限的方式启动
/etc/init.d/mysqld --skip-grant-tables start

3.然后用空密码方式使用root用户登录 MySQL
mysql -u root

4.修改密码
MySQL> update mysql.user set password=PASSWORD('newpassword') where User='root’;

5.重启服务
/etc/init.d/mysqld restart

远程连接会出现下面错误：
error:MySQL said: Host '223.223.196.221' is not allowed to connect to this MySQL server

解决：开发mysql远程登录
1.改表法。可能是你的帐号不允许从远程登陆，只能在localhost。这个时候只要在localhost的那台电脑，登入mysql后，更改 "mysql" 数据库里的 "user" 表里的 "host" 项，从"localhost"改称"%"
mysql -u root -pvmware
mysql>use mysql;
mysql>update user set host = '%' where user = 'root’;
mysql>select host, user from user;

2. 授权法。例如，你想myuser使用mypassword从任何主机连接到mysql服务器的话。
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'%' IDENTIFIED BY 'mypassword' WITH GRANT OPTION;
如果你想允许用户myuser从ip为192.168.1.3的主机连接到mysql服务器，并使用mypassword作为密码
GRANT ALL PRIVILEGES ON *.* TO 'myuser'@'192.168.1.3' IDENTIFIED BY
'mypassword' WITH GRANT OPTION;