nginx代理緩存

#（1）緩存介紹 1.代理服務器端緩存做用減小後端壓力，提升網站併發延時 2.緩存常見類型服務器端緩存：代理緩存,獲取服務器端內容進行緩存瀏覽器端緩存 3.nginx代理緩存：proxy_cache #（2）代理緩存配置 1.緩存配置html

#vim /usr/local/nginx/conf/nginx.conf 
upstream node {
	server 192.9.191.31:8081;
	server 192.9.191.31:8082;
}
proxy_cache_path /cache levels=1:2 keys_zone=cache:10m max_size=10g inactive=60m use_temp_path=off;
server {
	listen 80;
	server_name www.test.com;
	index index.html;
	location / {
	proxy_pass http://node;
	proxy_cache	cache;
	proxy_cache_valid	200 304 12h;
	proxy_cache_valid	any	10m;
	add_header	Nginx-Cache	"$upstream_cache_status";
	proxy_next_upstream	error timeout invalid_header http_500 http_502 http_503 http_504;
		}
	}

2.參數詳解node

proxy_cache_path /soft/cache levels=1:2 keys_zone=cache:10m max_size=10g inactive=60m use_temp_path=off;
	#proxy_cache	//存放緩存臨時文件
	#levels			//按照兩層目錄分級
	#keys_zone		//開闢空間名,10m:開闢空間大小,1m可存放8000key
	#max_size		//控制最大大小,超事後Nginx會啓用淘汰規則
	#inactive		//60分鐘沒有被訪問緩存會被清理
	#use_temp_path	//臨時文件,會影響性能,建議關閉

proxy_cache	cache;
proxy_cache_valid	200 304 12h;
proxy_cache_valid	any	10m;
add_header	Nginx-Cache	"$upstream_cache_status";
proxy_next_upstream	error timeout invalid_header http_500 http_502 http_503 http_504;
	#proxy_cache			//開啓緩存
	#proxy_cache_valid		//狀態碼200|304的過時爲12h,其他狀態碼10分鐘過時
	#proxy_cache_key		//緩存key
	#add_header				//增長頭信息,觀察客戶端respoce是否命中
	#proxy_next_upstream 	//出現502-504或錯誤,會跳過此臺服務器訪問下一臺服務器

3.建立緩存目錄nginx

mkdir /cache 
nginx -t 
nginx -s reload

4.驗證 #（3）清除緩存 1.rm刪除已緩存的數據 rm -rf /cache/* 2.經過ngx_cache_purge擴展模塊清理,須要編譯安裝nginx #（4）部分頁面不緩存 1.nginx配置vim

#vim /usr/local/nginx/conf/nginx.conf 
upstream node {
        server 192.9.191.31:8081;
        server 192.9.191.31:8082;
}
proxy_cache_path /cache levels=1:2 keys_zone=cache:10m max_size=10g inactive=60m use_temp_path=off;
server {
        listen 80;
        server_name www.test.com;
        index index.html;
        if ($request_uri ~ ^/(static|login|register|password)) {
                set $cookie_nocache 1;
                }
        location / {
                proxy_pass http://node;
                proxy_cache     cache;
                proxy_cache_valid       200 304 12h;
                proxy_cache_valid       any     10m;
                add_header      Nginx-Cache     "$upstream_cache_status";
                proxy_next_upstream     error timeout invalid_header http_500 http_502 http_503 http_504;
                proxy_no_cache $cookie_nocache $arg_nocache $arg_comment;
                proxy_no_cache $http_pargma $http_authorization;
                }
        }

2.重啓加驗證後端

nginx -t 
nginx -s reload

兩次都沒有命中 #（4）統計日誌命中率 1.日誌格式:變量$upstream_cache_status"瀏覽器

#vim /usr/local/nginx/conf/nginx.conf 		
log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                  '$status $body_bytes_sent "$http_referer" '
                  '"$http_user_agent" "$http_x_forwarded_for" "$upstream_cache_status"';
access_log logs/access.log main;
error_log logs/error.log;

2.查看日誌 3.統計日誌命中率加入到計劃任務中這裏省略緩存

awk '{if($NF = "HIT"){count++;}} END{printf "%.2f%",count/NR*100}' /usr/local/nginx/logs/access.log