debian: nginx前后端负载均衡，日志显示真实ip

借鉴：

缓存后端Web服务器上的静态页面。
https://blog.youkuaiyun.com/weixin_43064185/article/details/106235587

后端服务器日志内容需要记录真实客户端的IP地址。
参考https://blog.youkuaiyun.com/name_the_king/article/details/115237270

简要：

	server {
		listen	80;
		server_name	www.yunjisuan.com;
		location / {
	  	proxy_pass http://www_server_pools;
	    proxy_set_header host $host;
	    proxy_set_header X-Real-IP $remote_addr;
	        #在代理向后端服务器发送的http请求头中加入X-Forwarded-For字段信息，用于后端服务器程序，日志等接收记录真实用户的IP，而不是代理服务器的IP
			}
		}
	}

日志格式设置
	log_format main'$remote_addr-$remote_user[$time_local]"$request"'
	'$status $body_bytes_sent "$http_referer"'
	'"$http_user_agent""$http_x_forwarded_for"';


   log_format  main  '$remote_addr" "$remote_user" "[$time_local]" "$request"'
                     ' "$status" "$body_bytes_sent" "$http_referer"'
                     ' "$http_user_agent" "$http_x_forwarded_for" "$gzip_ratio"'
                     ' "$upstream_addr" "$request_time" "$upstream_response_time" "$http_host"';

静态缓存

	http层
	    proxy_connect_timeout 10;
	    proxy_read_timeout 180;
	    proxy_send_timeout 5;
	    proxy_buffer_size 16k;
	    proxy_buffers 4 32k;
	    proxy_busy_buffers_size 96k;
	    proxy_temp_file_write_size 96k;
	    proxy_temp_path /tmp/temp_dir;

	    proxy_cache_path /tmp/cache levels=1:2 keys_zone=cache_one:100m inactive=1d max_size=10g;


	server层
	    server {
	        listen       80 default_server;
	        server_name  localhost;
	        root /mnt/blog/;
	 
	        location / {
	 
	        }
	 
	        # 静态文件html缓存
	            location ~ /*\.html$ {
	                  proxy_pass http://127.0.0.1:8000$request_uri;
	                  proxy_redirect off;
	                  proxy_cache cache_one;
	                  proxy_cache_valid 200 304 12h;
	                  proxy_cache_valid 301 302 1d;
	                  proxy_cache_valid any 5m;
	                  expires 1d;
	                  add_header wall  "hey, nginx静态文件缓存";
	            }
	}