mysql Access denied for user ‘root’@’localhost’ (using password: YES)解决方法

今天在启动mysql时出现以下问题：

[root@www ~]# mysql -u root -p
enter password: 
error 1045 (28000): access denied for user 'root'@'localhost' (using password: yes)

网上的答案是各种各样的，最终解决问题的方法总结为以下，好多都是没有设置初始密码造成此问题的。

解决方法如下：

[root@www ~]# service mysqld stop   #先关闭mysql服务
stopping mysqld:                      [ ok ]
[root@www ~]# mysql
error 2002 (hy000): can't connect to local mysql server through socket '/var/lib/mysql/mysql.sock' (2)
[root@www ~]# mysql -u root -p      #关闭服务后又出现如下问题
enter password: 
error 2002 (hy000): can't connect to local mysql server through socket '/var/lib/mysql/mysql.sock' (2)
[root@www ~]# mysql -u root mysql    #键入此命令进入mysql
reading table information for completion of table and column names
you can turn off this feature to get a quicker startup with -a
welcome to the mysql monitor. commands end with ; or \g.
your mysql connection id is 1
server version: 5.1.73 source distribution
copyright (c) 2000, 2013, oracle and/or its affiliates. all rights reserved.
oracle is a registered trademark of oracle corporation and/or its
affiliates. other names may be trademarks of their respective
owners.
type 'help;' or '\h' for help. type '\c' to clear the current input statement.
mysql> update user set password=password('123') where user='root' and host='localhost';  ---->修改root的密码
query ok, 1 row affected (0.04 sec)
rows matched: 1 changed: 1 warnings: 0
mysql> flush priviledge;
error 1064 (42000): you have an error in your sql syntax; check the manual that corresponds to your mysql server version for the right syntax to use near 'priviledge' at line 1
mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)
mysql> \q
bye
[root@www ~]# mysql -u root -p           ------>重新进入
enter password: 
welcome to the mysql monitor. commands end with ; or \g.
your mysql connection id is 2
server version: 5.1.73 source distribution
copyright (c) 2000, 2013, oracle and/or its affiliates. all rights reserved.
oracle is a registered trademark of oracle corporation and/or its
affiliates. other names may be trademarks of their respective
owners.
type 'help;' or '\h' for help. type '\c' to clear the current input statement.
mysql> \q
bye

到此就完了！！