负载均衡配置：

[root@lb01 ~]# cat /etc/nginx/nginx.conf
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
    worker_connections 1024;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';
    access_log  /var/log/nginx/access.log  main;
    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;
    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;
    upstream web_pools {
    server 10.0.0.7:80;
    server 10.0.0.8:80;
    }
    server {
    listen 80;
    server_name www.oldboy.com;
       location / {
       proxy_pass  http://web_pools;
       proxy_set_header  Host  $host;
       proxy_set_header  X-Forwarded-For  $remote_addr;
       #修改 反向代理 向后端 服务器 请求的请求头
       }
    }
    server {
    listen 80;
    server_name blog.oldboy.com;
       location / {
       proxy_pass  http://web_pools;
       proxy_set_header  Host  $host;
       proxy_set_header  X-Forwarded-For  $remote_addr;
       }
    }


}

客户端：需要在nginx配置文件中的日志部分加入
X-Forwarded-For