我运行一个Nginx服务器PHP webservices API.我使用Nginx的fastcgi_cache来缓存所有GET请求,当更新某些资源时,我清除一个或多个相关的缓存资源.

我用来执行此操作的方法是为要清除的每个资源计算Nginx缓存文件名,然后删除该文件.在大多数情况下,这很有效.

但是,我发现有时候,即使删除了缓存文件,Nginx仍然会从缓存中返回数据.

选择要删除的正确缓存文件不是问题 – 作为我测试的一部分,我删除了整个缓存目录,Nginx仍然返回HIT响应

有人知道为什么会这样吗？是否可能涉及另一个缓存？例如,操作系统是否正在将缓存文件的缓存版本返回给Nginx,因此Nginx不知道它已被删除？

我在CentOS上运行它,并使用这个Nginx配置(减去不相关的部分)：

user Nginx;

# Let Nginx figure out the best value
worker_processes auto;

events {
    worker_connections  10240;
    multi_accept        on;
    use                 epoll;
}

# Maximum number of open files should be at least worker_connections * 2
worker_rlimit_nofile 40960;

# Enable regex JIT compiler
pcre_jit on;

http {

    # TCP optimisation
    sendfile        on;
    tcp_nodelay     on;
    tcp_nopush      on;

    # Configure keep alive
    keepalive_requests  1000;
    keepalive_timeout   120s 120s;

    # Configure SPDY
    spdy_headers_comp 2;

    # Configure global PHP cache
    fastcgi_cache_path /var/Nginx/cache levels=1:2 keys_zone=xxx:100m inactive=24h;

    # Enable open file caching
    open_file_cache max=10000 inactive=120s;
    open_file_cache_valid 120s;
    open_file_cache_min_uses 5;
    open_file_cache_errors off;

    server {
        server_name xxx;
        listen 8080;

        # Send all dynamic content requests to the main app handler
        if (!-f $document_root$uri) {

            rewrite ^/(.+)    /index.PHP/$1         last;
            rewrite ^/        /index.PHP            last;
        }

        # Proxy PHP requests to PHP-fpm
        location ~ [^/]\.PHP(/|$) {

            # Enable caching
            fastcgi_cache xxx;

            # Only cache GET and HEAD responses
            fastcgi_cache_methods GET HEAD;

            # Caching is off by default,an can only be enabled using Cache-Control response headers
            fastcgi_cache_valid 0;

            # Allow only one identical request to be forwarded (others will get a stale response)
            fastcgi_cache_lock on;

            # Define conditions for which stale content will be returned
            fastcgi_cache_use_stale error timeout invalid_header updating http_500 http_503;

            # Define cache key to uniquely identify cached objects
            fastcgi_cache_key "$scheme$request_method$host$request_uri";

            # Add a header to response to indicate cache results
            add_header X-Cache $upstream_cache_status;

            # Configure standard server parameters
            fastcgi_split_path_info ^(.+\.PHP)(/.+)$;
            include fastcgi_params;

            # PHP-fpm config
            fastcgi_param SCRIPT_URL        $fastcgi_path_info;
            fastcgi_param PATH_INFO         $fastcgi_path_info;
            fastcgi_param SCRIPT_FILENAME   $document_root$fastcgi_script_name;
            fastcgi_param REQUEST_SCHEME    $scheme;
            fastcgi_param REMOTE_USER       $remote_user;

            # Read buffer sizes
            fastcgi_buffer_size 128k;
            fastcgi_buffers 256 16k;
            fastcgi_busy_buffers_size 256k;
            fastcgi_temp_file_write_size 256k;

            # Keep connection open to enable keep-alive
            fastcgi_keep_conn on;

            # Proxy to PHP
            fastcgi_pass unix:/var/run/PHP-fpm/fpm.sock;
        }
    }
}

现在我看一下,open_file_cache参数是否会影响缓存文件？

有任何想法吗？