使用Nginx解析CGI的同學應該都看到過這個：
http://wiki.nginx.org/SimpleCGI
保存爲cgiwrap-fcgi.pl後，就可以解析bash等cgi程序了
但在實際使用經常遇到如下問題：
2012/08/06 15:35:16 [error] 8483#0: *147071273 connect() to unix:/dev/shm/cgiwrap-dispatch.sock failed (11: Resource temporarily unavailable) while connecting to upstream...
原因和php-fpm遇到Resource temporarily unavailable時的原因一樣，backlog設置的不夠大。
解決方法：
源代碼第35行左右，FCGI::OpenSocket
- $socket = FCGI::OpenSocket( "/dev/shm/cgiwrap-dispatch.sock", 10 )
- ; #use UNIX sockets - user running this script must have w access to the 'nginx' folder!!
經過查詢http://search.cpan.org/~skimo/FCGI-0.67/FCGI.PL
得知：
FCGI::OpenSocket(path, backlog)
Creates a socket suitable to use as an argument to Request.
path
Pathname of socket or colon followed by local tcp port. Note that some systems take file permissions into account on Unix domain sockets, so you'll have to make sure that the server can write to the created file, by changing the umask before the call and/or changing permissions and/or group of the file afterwards.
backlog
Maximum length of the queue of pending connections. If a connection request arrives with the queue full the client may receive an error with an indication of ECONNREFUSED.所以只需將FCGI::OpenSocket的第二個參數改大即可，例如
- $socket = FCGI::OpenSocket( "/dev/shm/cgiwrap-dispatch.sock", 1024 )
- ; #use UNIX sockets - user running this script must have w access to the 'nginx' folder!!
另外需要注意的是
/dev/shm/cgiwrap-dispatch.sock
這個文件的所屬用戶和所屬組，nginx要能夠對這個文件進行w操作，因此別忘了：
chown nginx.nginx /dev/shm/cgiwrap-dispatch.sock