nginx做负载均衡反向代理的配置范例

#根据服务器核心数设定
worker_processes  1;
error_log    /usr/local/nginx/logs/nginx_error.log    crit;
pid          /usr/local/nginx/nginx.pid;
worker_rlimit_nofile   51200;
events {
use epoll;
worker_connections 51200;
}
http {
include            mime.types;
default_type    application/octet-stream;
source_charset GB2312;
server_names_hash_bucket_size 256;
client_header_buffer_size 256k;
large_client_header_buffers 4 256k;
#size limits
client_max_body_size            50m;
client_body_buffer_size        256k;
client_header_timeout    3m;
client_body_timeout 3m;
send_timeout            3m;
sendfile on;
tcp_nopush        on;
keepalive_timeout 120; #参数加大,以解决做代理时502错误
tcp_nodelay on;

#定义一个服务器列表,weight代表权重,值越高越容易分配到.
upstream webservers{
server 192.168.12.2:80 weight=1;
server 192.168.12.3:80 weight=2;
keepalive 100;  #负载均衡点的可用检测
#nginx支持的几种算法,1,轮询 2,weight 3,ip hash 4,fair(第三方) 5,url_hash (第三方)
#ip_hash为每个请求按访问ip的hash结果分配，每个访客有固定的后端服务器，可以解决session问题
ip_hash;
}
server {
listen                80;
server_name  192.168.12.1;
charset GB2312;
location / {
#使用proxy_pass代替一般配置中的fastcgi_pass
proxy_pass
proxy_redirect off ;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header REMOTE-HOST $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 50m;
client_body_buffer_size 256k;
proxy_connect_timeout 30;
proxy_send_timeout 30;
proxy_read_timeout 60;
proxy_buffer_size 256k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
proxy_temp_file_write_size 256k;
proxy_next_upstream error timeout invalid_header http_500 http_503 http_404;
proxy_max_temp_file_size 128m;
}
}
}