Run cherrypy WSGI server as a daemon

cherrypy_daemon.py

from cherrypy.process.plugins import Daemonizer,PIDFile
import cherrypy
import argparse

parser = argparse.ArgumentParser(description="My server daemon")
parser.add_argument('-d','--daemon',help='Run the server as a daemon using the traditional double fork',action='store_true')
parser.add_argument('-a','--bind-address',help='Network interface to bind to',default='127.0.0.1')
parser.add_argument('-p','--port',help='Port to bind to',default=8080,type=int)
parser.add_argument('--pidfile',help='process id file',type=str)
args = parser.parse_args()

#this is your wsgi app: it could be a flask, werkzeug, pylons app etc
def application(environ, start_response):
    start_response('200 OK', [('content-type', 'text/plain')])
    return ('Hello world!',)
    
cherrypy.config.update({
    'server.socket_host':args.bind_address,
    'server.socket_port':args.port
})

cherrypy.tree.graft(application,'/')

if args.daemon:
    Daemonizer(cherrypy.engine).subscribe()
    
if args.pidfile:
    PIDFile(cherrypy.engine,args.pidfile).subscribe()
    
cherrypy.engine.start()

Why do you not use the 'cherryd -d' command for daemonize?