nginx代理缓存

写的很好的一篇博主：https://www.cnblogs.com/lovelinux199075/p/9064431.html

亲测有效

1、缓存介绍

1.代理服务器端缓存作用
       减少后端压力，提高网站并发延时
2.缓存常见类型
      服务器端缓存：代理缓存,获取服务器端内容进行缓存，浏览器端缓存
3.nginx代理缓存
      proxy_cache

2、代理缓存配置

1.缓存配置

#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;
        }
    }

 2.参数详解

proxy_cache_path /soft/cache levels=1:2 keys_zone=cache:10m max_size=10g inactive=60m use_temp_path=off;
    #proxy_cache    //存放缓存临时文件
    #levels         //按照两层目录分级
    #keys_zone      //开辟空间名,10m:开辟空间大小,1m可存放8000key
    #max_size       //控制最大大小,超过后Nginx会启用淘汰规则
    #inactive       //60分钟没有被访问缓存会被清理
    #use_temp_path  //临时文件,会影响性能,建议关闭

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            //开启缓存
    #proxy_cache_valid      //状态码200|304的过期为12h,其余状态码10分钟过期
    #proxy_cache_key        //缓存key
    #add_header             //增加头信息,观察客户端respoce是否命中
    #proxy_next_upstream    //出现502-504或错误,会跳过此台服务器访问下一台服务器

3.创建缓存目录

mkdir /cache 
nginx -t 
nginx -s reload 

 

3、清除缓存

1.rm删除已缓存的数据
rm -rf /cache/*
2.通过ngx_cache_purge扩展模块清理,需要编译安装nginx

4、部分页面不缓存

#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;
                }
        }

 3.1、重启加验证

nginx -t 
nginx -s reload 

3.2、两次没有命中

 4、统计日志命中率

 1.日志格式:变量$upstream_cache_status"

#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、查看日志

 

3、统计日志命中率加入到计划任务中这里省略

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