Nginx reverse proxy and load balancing practice

user www www;
worker_processes 10;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
#最大文件描述符
worker_rlimit_nofile 51200;
events {
worker_connections 51200;
}
http {
include conf/mime.types;
default_type application/octet-stream;
keepalive_timeout 120;
tcp_nodelay on;
#nginx的upstream默认是以轮询的方式实现负载均衡，这种方式中，每个请求按时间顺序逐一分配到不同的后端服务器，
#如果后端服务器down掉，能自动剔除。另外一种方式是ip_hash：每个请求按访问ip的hash结果分配，
#这样每个访客固定访问一个后端服务器，可以解决session的问题。
upstream webserver  {
server 192.168.1.2:80 weight=1;
server 192.168.1.3:80 weight=1;
}
server{
listen 80;
server_name localhost;
location / {
#设置反向代理的地址
proxy_pass http://webserver;
#设置主机头和客户端真实地址，以便服务器获取客户端真实IP
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
log_format localhost '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /data1/logs/www.log localhost ;
}
}