Nginx基本配置、性能优化指南<转>
nginx基本配置参考：
http://www.chinaz.com/web/2015/0424/401323_2.shtml

Ubuntu下编译安装Keepalived
复制代码 代码示例:cd /usr
wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
使用tar命令解压缩：
复制代码 代码示例:tar zxvf keepalived-1.2.7.tar.gz
编译之前需要安装几个程序库：
复制代码 代码示例:apt-get install libssl-dev
apt-get install openssl
apt-get install libpopt-dev
然后运行：
复制代码 代码示例:./configure --prefix=/usr 得到如下结果：
http://www.jbxue.com/LINUXjishu/14320.html

nginx+keepalived配置高可用的负载均衡
------------------------
在keepalived中配置nginx监视脚本。
if [ "$(ps -ef | grep "nginx: master process"| grep -v grep )" == "" ]
then
killall keepalived
---------------------------------------------
keepalived (slave) -> nginx ->(loadbance) ->{ apache.tomcat.server1,apache.tomcat.server2}
keepalived (master)- >nginx ->(loadbance) -> { apache.tomcat.server1,apache.tomcat.server2}
keepalived(master)一旦宕机或者不可用，跳转到slave，slave的nginx继续作为loadblance服务。
参考：http://www.jbxue.com/article/2916.html

关于 tomcat 集群中 session 共享的三种方法
http://www.cnblogs.com/interdrp/p/4056525.html

乐视分表分库实践 Distributed & HA & Finally Consistent
乐视秒杀：每秒十万笔交易的数据架构解读
http://dbaplus.cn/news-21-420-1.html