发布于 2014-12-06 08:48:29 | 3314 次阅读 | 评论: 1 | 来源: PHPERZ
Mysql关系型数据库管理系统
MySQL是一个开放源码的小型关联式数据库管理系统，开发者为瑞典MySQL AB公司。MySQL被广泛地应用在Internet上的中小型网站中。由于其体积小、速度快、总体拥有成本低，尤其是开放源码这一特点，许多中小型网站为了降低网站总体拥有成本而选择了MySQL作为网站数据库。
本文为大家讲解的是mysql错误：mysqladmin: connect to server at 'localhost' failed的解决方法，感兴趣的同学参考下。
错误描述：
登陆mysql失败,通过mysqladmin修改密码失败，如下：
[root@mysql var]# mysqladmin -u root password '123456'
mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'root'@'localhost' (using password: NO)'
解决步骤如下：
1 停止mysql服务
[root@mysql var]# /etc/init.d/mysqld stop
Shutting down MySQL.... SUCCESS!
2 安全模式启动
[root@mysql var]# mysqld_safe --skip-grant-tables &
/opt/mysql/product/5.5.25a/bin/mysqld_safe --skip-grant-tables &
[1] 10912
[root@mysql var]# 110407 17:39:28 mysqld_safe Logging to '/usr/local/mysql/var//mysql.chinascopefinanical.com.err'.
110407 17:39:29 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/var/
3 无密码root帐号登陆
[root@mysql var]# /usr/bin/mysql -uroot -p 【注释，在下面的要求你输入密码的时候，你不用管，直接回车键一敲就过去了】
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 48
Server version: 5.1.41-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use mysql;
Database changed
4 手动update修改密码
mysql> update user set password=password("guxxxxxahyVh") where user='root' and host='localhost';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 0
//更新权限表
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
//退出mysql
mysql> quit
Bye
5 正常重新启动
[root@mysql var]# service mysqld restart
Shutting down MySQL..110407 17:45:29 mysqld_safe mysqld from pid file /usr/local/mysql/var//mysql.chinascopefinanical.com.pid ended
SUCCESS!
Starting MySQL.. SUCCESS!
[1]+ Done mysqld_safe --skip-grant-tables
[root@mysql var]#
6 重新登录
[root@mysql var]# mysql -uroot -p123445
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 172
Server version: 5.1.41-log Source distribution
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> quit
Bye
搞定。