Centos – configuring FastCGI on CentOS with PHP

As far as I know, PHP's FastCGI interpreter doesn't react to signals like HUP, USR1 or USR2 to reload its configuration.

Maybe PHP-FPM could help you to achieve what you want. On the downside, it requires patching PHP.

trac should be now WSGI compliant, so you can use any supported method to run the site. If it is a low traffic site, you can always use CGI, and eventually move to something else later if you need it. For the other methods, use mod_wsgi or install flup for FCGI (even if it installed extra dependencies).

To use flup, you have to import the appropriate WSGI server, then run it, i.e.

from flup.server.fcgi_fork import WSGIServer
def main_app(...):
  ...

WSGIServer(main_app).run()

If you want to run it as external server (i.e. not started by the web server), substitute this:

WSGIServer(main_app,bindAddress=('1.2.3.4',9999)).run()