有的时候偶尔会出现这个问题 2005 Unknown MySQL server host 'localhost' (11001)，刚开始重启电脑ok了，但是不能每次出现这个问题就重启电脑吧，太麻烦了，总得找到原因。
ERROR 2005 (HY000): Unknown MySQL server host 'localhost' (0)
修改文件C:WindowsSystem32driversetchosts
添加127.0.0.1 localhost
在我的文件中这入口也是0.0.0.0 localhost：所以导致了这个问题，具体问什么会导致就不太清楚了
参考：http://stackoverflow.com/questions/16580370/mysql-error-2005-unknown-mysql-server-host-localhost11001
modify list of host names for your system:
C:WindowsSystem32driversetchosts
Make sure that you have the following entry:
127.0.0.1 localhost
In my case that entry was 0.0.0.0 localhost which caussed all problem
(you may need to change modify permission to modify this file)
This performs DNS resolution of host “localhost” to the IP address 127.0.0.1.
localhost是host文件中代表127.0.0.1的一个名称, 如果在这个文件中去掉的话localhost就没有实际意义
