redis安装:http://mwt198668.blog.163.com/blog/static/48803692201132141755962/
memcache安装:http://blog.csdn.net/barrydiu/article/details/3936270
redis设置主从服务器:http://www.jzxue.com/fuwuqi/fuwuqijiqunyuanquan/201104/15-7117.html
memcache设置主从服务器:http://www.cnblogs.com/yuanermen/archive/2011/05/19/2051153.html