ablout unbuntu default mysql

http://www.ghostchina.com/how-to-reset-mysqls-root-password/

http://blog.csdn.net/u010603691/article/details/50379282

http://www.ithao123.cn/content-10746582.html

http://www.cnblogs.com/cnblogsfans/archive/2009/09/21/1570942.html

show variables like 'port';