Nginx Proxy缓存的具体实现

缓存开关
Syntax: 	    proxy_cache zone | off;
Default: 	    proxy_cache off;
Context: 	http, server, location

代理缓存
Syntax: 	proxy_cache_path path [levels=levels] 			keys_zone=name:size[inactive=time] [max_size=size] 			[manager_files=number]
Default:  —
Context: http
example:proxy_cache_path /data/nginx/cache levels=1:2 keys_zone=one:10m;

缓存维度
Syntax: 	    proxy_cache_key string;  定义缓存唯一key,通过唯一key来进行hash存取，缓存文件名
Default: 	    proxy_cache_key $scheme$proxy_host$request_uri;
Context: 	http, server, location

缓存过期
Syntax: 	    proxy_cache_valid [code ...] time;
Default: 	    —
Context: 	http, server, location
proxy_cache_valid 200 302 10m;
proxy_cache_valid 404      1m;

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

    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;

    keepalive_timeout  65;

    gzip  on;

    include /etc/nginx/conf.d/*.conf;
    #开启反向代理缓存
    proxy_cache_path /app/limou/cache levels=1:2 keys_zone=proxy_cache:10m max_size=10g inactive=2h use_temp_path=off;
}

server {
    listen       80;
    server_name  localhost;

    access_log  /var/log/nginx/host.access.log  main;

    location / {
        root   /usr/share/nginx/html;
        index  index.html index.htm;
        #开启反向代理缓存
        # Proxy_cache   使用名为 的对应缓存配置
		proxy_cache proxy_cache;
        # proxy_cache_valid  200 206 304 301 302 12h;
        # 对http状态码为200、304…的内容缓存12小时
        proxy_cache_valid 200 304 12h;
        # 设置不同相应码的缓存时间，除了上面配置12小时的，其他的的存10分钟
        proxy_cache_valid any 10m;
        # proxy_cache_key $uri  定义缓存唯一key,通过唯一key来进行hash存取
        proxy_cache_key $host$uri$is_args$args;
        # add_header：判断数据包是否缓存了该信息
        #缓存命中情况如何在http头中体现，以及在nginx日志中查看
        add_header  Nginx-Cache "$upstream_cache_status";
         # 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
        proxy_next_upstream error timeout invalid_header http_500 http_502 http_503 http_504;
        
    }

    #error_page  404              /404.html;

    # redirect server error pages to the static page /50x.html
    #
    error_page   500 502 503 504  /50x.html;
    location = /50x.html {
        root   /usr/share/nginx/html;
    }

    # proxy the PHP scripts to Apache listening on 127.0.0.1:80
    #
    #location ~ \.php$ {
    #    proxy_pass   http://127.0.0.1;
    #}

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #    root           html;
    #    fastcgi_pass   127.0.0.1:9000;
    #    fastcgi_index  index.php;
    #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
    #    include        fastcgi_params;
    #}

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #    deny  all;
    #}
}