2. 重启mysql服务
/etc/init.d/mysqld restart
3. 使用下列命令登陆mysql，无需密码
mysql
4. 登陆后，重新添加root用户
use mysql;
insert into user set user='root',ssl_cipher='',x509_issuer='',x509_subject='';
update user set Host='localhost',select_priv='y', insert_priv='y',update_priv='y', Alter_priv='y',delete_priv='y',create_priv='y',drop_priv='y',reload_priv='y',shutdown_priv='y',Process_priv='y',file_priv='y',grant_priv='y',References_priv='y',index_priv='y',create_user_priv='y',show_db_priv='y',super_priv='y',create_tmp_table_priv='y',Lock_tables_priv='y',execute_priv='y',repl_slave_priv='y',repl_client_priv='y',create_view_priv='y',show_view_priv='y',create_routine_priv='y',alter_routine_priv='y',create_user_priv='y'
where user='root';
先退出：quit;
5. 使用下列命令重新登陆， 设置root的密码
mysql -u root
update mysql.user set password=password('yourrootpasswd') where user='root';
update user set host = '%' where user = 'root'; #设置远程机器可访问mysql，如果不需要可不是设置
flush privileges;
quit;
6. 修改/etc/my.conf文件，将skip-grant-tables去掉，然后重启mysql
/etc/init.d/mysqld restart
7. 正常则一切OK
参考：
[1]. http://jingyan.baidu.com/article/7c6fb4287c6138802c9003.html
