Nginx+Tomcat+Keepalived负载均衡动静分离技术
一：Nginx+Tomcat的动静分离所谓动静分离就是通过nginx（或apache等）来处理用户端请求的图片、html等静态的文件，tomcat（或weblogic）处理jsp、do等动态文件，从而达到动静页面访问时通过不同的容器来处理。
nginx处理静态页面效率远高于tomcat，而tomcat擅长动态页面处理，这样一来就能更好的提高并发，处理性能。
页面压力测试
ab -n 1000 -c 200 http://10.10.54.157/index.html
二：具体步骤
//环境介绍
1.主机
centos6.5 IP:192.168.50.196 IP:192.168.50.173
2.在此主机上安装nginx，及一个tomcat，nginx的反向代理功能可以把用户请求负载到tomcat上
nginx使用80端口，tomcat使用8080端口
目的：当访问10.10.54.157这台服务器时，静态页面由nginx处理，动态页面由tomcat处理
3.软件下载
wget http://nginx.org/download/nginx-1.7.3.tar.gz
//安装nginx
1.编译安装
shell> yum-y install zlib-devel pcre-devel openssl-devel #nginx依赖包
shell>useradd -s /sbin/nologin -M nginx //添加nginx 用户，没有登录shell，没有家目录.
shell> tar xvf nginx-1.7.3.tar.gz
shell> cd nginx-1.7.3
shell> ./configure --prefix=/usr/local/nginx --with-pcre --with-http_stub_status_module --user=nginx --group=nginx --with-http_ssl_module --with-http_gzip_static_module
shell> make && make install
2.启动nginx
shell> /usr/local/nginx/sbin/nginx
//配置nginx.conf实现负载均衡，动静分离
shell> vim /usr/local/nginx/conf/nginx.conf
--------------------------------------------------------
usernginx nginx; #用户，tomcat默认首页也要改为apache用户
worker_processes2;
#error_loglogs/error_nginx.log;
pid logs/nginx.pid;
events {
worker_connections1024;
}
http
{
include mime.types;
default_typeapplication/octet-stream;
server_names_hash_bucket_size 128;
client_header_buffer_size 32k;
large_client_header_buffers 4 32k;
client_max_body_size 8m;
sendfile on;
keepalive_timeout 60;
gzip on;
#负载均衡
upstream yan {
server 192.168.50.173:8080 max_fails=3 weight=1 fail_timeout=60s;
server 192.168.50.196:8080 max_fails=3 weight=1 fail_timeout=60s;
}
server
{
listen 80;
server_namelocalhost;
index index.jsp index.php index.do index.jsp;
access_loglogs/yan_access_nginx.log;
error_log logs/yan_error.log;
root/var/www/nginx; #nginx默认根目录
location ~ \.(jsp|do|action)$ { #jsp,do等页面交由tomcat处理
proxy_pass http://yan;
proxy_set_header HOST $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$ {
expires 30d;
}
}
}
参考：
http://www.cnblogs.com/yuanermen/p/3724804.html
http://my.oschina.net/zijian1315/blog/208676
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