好不容易搭建的环境，运行Php正常，进行cgi文件运行测试时出现：

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去看日志文件perl-fcgi.log ，发现提示：

[2012-07-13 16:46]   Starting Nginx-cfgi
[2012-07-13 16:46]   Running with 99 UID
[2012-07-13 16:46]   Perl 5.008008
[2012-07-13 16:46]   Testing socket options
[2012-07-13 16:46]   Deamon listening at UNIX socket /opt/nginx/logs/perl-fcgi.sock
[2012-07-13 16:46]   Can not use PID file /opt/nginx/logs/perl-fcgi.pid, already exists.
 

说是perl-fcgi.pid已经存在，这意思难道是之前系统非正常停止导致的？

那就先./start_perl_cgi.sh stop ，然后再./start_perl_cgi.sh start ，居然恢复正常了。