今天在启动mysql时出现以下问题：

[root@www ~]# mysql -u root -pEnter 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 ~]# mysqlERROR 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mysqlReading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -AWelcome to the MySQL monitor. Commands end with ; or \g.Your MySQL connection id is 1Server version: 5.1.73 Source distributionCopyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.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: 0mysql> 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 1mysql> flush privileges;Query OK, 0 rows affected (0.00 sec)mysql> \qBye[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 2Server version: 5.1.73 Source distributionCopyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql> \qBye

到此就完了！！