清除nginx緩存文件並不總是有效

我運行nginx服務器+ PHP webservices API。我使用nginx的fastcgi_cache來緩存所有的GET請求，當某些資源更新時，我清除一個或多個相關的緩存資源。清除nginx緩存文件並不總是有效

我正在使用的方法是爲我要清除的每個資源計算nginx緩存文件名，然後刪除該文件。大多數情況下，這很有效。

但是，我發現有時，即使刪除緩存文件後，nginx仍會從緩存中返回數據。

這不是選擇正確的緩存文件，刪除了一個問題 - 我的測試的一部分，我已經刪除了整個緩存目錄，nginx的仍返回HIT響應

是任何人都知道的爲什麼這可能會發生？是否有可能涉及另一個緩存？例如，操作系統是否將緩存文件的緩存版本返回給nginx，是否nginx不知道它已被刪除？

我在CentOS運行此，以及與此nginx的配置（減去不相關部分）：

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; 
     } 
    } 
}

現在我看這個，可以在open_file_cache參數是影響緩存文件？

任何想法？

來源

2015-09-09 user2943799

來想起來了，這其實是一個非常好的問題。:-) – cnst