MySQL突然不能用了，症状如下：
[root@bogon ok]# mysql ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
[root@bogon ok]# mysql -uroot -p Enter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
[root@bogon ok]# /etc/init.d/httpd start 正在启动 httpd：
[root@bogon ok]# /etc/init.d/mysqld restart 停止 mysqld： [确定] 正在启动 mysqld： [确定]
[root@bogon ok]# mysql ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) [root@bogon ok]# mysql -uroot -p Enter password: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
解决方法：重改密码 [root@bogon ok]# /etc/init.d/mysqld stop 停止 mysqld： [确定]
[root@bogon ok]# mysqld_safe --user=mysql --skip-grant-tables --skip-networking & [1] 10354 [root@bogon ok]# 150404 16:46:14 mysqld_safe Logging to '/var/log/mysqld.log'. 150404 16:46:14 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql [root@bogon ok]# mysql -u root mysql Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A 。。。。。。。 Type 'help;' or 'h' for help. Type 'c' to clear the current input statement. mysql>
[root@bogon ok]# mysql -u root -p
Enter password:
mysql>
问题解决。