解決ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

這種問題需要強行重新修改密碼，方法如下：

/etc/init.d/mysql stop   (service mysqld stop )
/usr/bin/mysqld_safe --skip-grant-tables
另外開個SSH連接
[root@localhost ~]# mysql
mysql>use mysql
mysql>update user set password=password("123456") where user="root";
mysql>flush privileges;
mysql>exit

pkill -KILL -t pts/0 可將pts為0的**用戶(之前運行mysqld_safe的用戶窗口)強制踢出
正常啟動 MySQL：/etc/init.d/mysql start   (service mysqld start)