在access.log中有大量400錯誤,并以每天幾百M的速度增加,占用大量空間.
代碼如下:
tail -f /opt/nginx/logs/access.log

    116.236.228.180 - - [15/Dec/2010:11:00:15 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:15 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:15 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:15 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:15 +0800] "-" 400 0 "-" "-"
    119.97.196.7 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    119.97.196.7 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    219.243.95.197 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"
    116.236.228.180 - - [15/Dec/2010:11:00:16 +0800] "-" 400 0 "-" "-"

網上大把的文章說是HTTP頭/Cookie過大引起的,可以修改nginx.conf中兩參數來修正.
代碼如下:
    client_header_buffer_size 16k;
          large_client_header_buffers 4 32k;

修改后
代碼如下:
    client_header_buffer_size 64k;
         large_client_header_buffers 4 64k;

沒有效果,就算我把nginx0.7.62升到最新的0.8.54也沒能解決.
在官方論壇中nginx作者提到空主機頭不會返回自定義的狀態碼,是返回400錯誤.
http://forum.nginx.org/read.php?2,9695,11560

最后修正如下
改為原先的值
代碼如下:
    client_header_buffer_size 16k;
         large_client_header_buffers 4 32k;

關閉默認主機的日志記錄就可以解決問題
代碼如下:
    server {
    listen *:80 default;
    server_name _;
    return 444;
    access_log   off;
    }