诡异的 ERROR 1045 (28000): Access denied for user 错误

问题描述：

用户已建，权限已赋予。long long ago这个用户是可以正常访问的，但是今天它就不能访问了。报错如下：

ERROR 1045 (28000): Access denied for user 'lf'@'172.17.215.11' (using password: YES)

排障过程：

select user,host,password  from mysql.user;
….
| lf| localhost     | *5A4CAF734551B5347FEC1171CEB89D503693C1B4 |
+--------------+---------------+-------------------------------------------+
select password(‘LF98$xxi’);
+-------------------------------------------+
| password('LF98$xxi')                      |
+-------------------------------------------+
| *5A4CAF734551B5347FEC1171CEB89D503693C1B4 |
+-------------------------------------------+
1 row in set (0.05 sec)

但是登录就是报错

[root@vhost02 ~]# mysql -ulf -pLF98$xxi
Warning: Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'lf'@'localhost' (using password: YES)

难道是权限没有刷新？

[root@vhost02 ~]# mysql -uroot -p
...
mysql>flush privileges;

重新登录仍然失败。。。

最终解决方式：

就在小编半晕半醒之间忽然灵光一现，用户名和密码分开输入吧，于是：

[root@vhost02 ~]# mysql -ulf -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 180
Server version: 5.6.25-log MySQL Community Server (GPL)
Copyright (c) 2000, 2015, 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>

成功登录了。原因居然是密码里含有$符号。特殊字符需要慎用，用不好就把自己给坑了。不过密码有$符号，并不影响它在脚本，程序里的使用。$的特殊性应该和系统命令有关。