python - Deploying CherryPy (daemon)

Question

I've followed the basic CherryPy tutorial (http://www.cherrypy.org/wiki/CherryPyTutorial). One thing not discussed is deployment.

How can I launch a CherryPy app as a daemon and "forget about it"? What happens if the server reboots?

Is there a standard recipe? Maybe something that will create a service script (/etc/init.d/cherrypy...)

Thanks!

Answer 1

Daemonizer can be pretty simple to use:

# this works for cherrypy 3.1.2 on Ubuntu 10.04
from cherrypy.process.plugins import Daemonizer
# before mounting anything
Daemonizer(cherrypy.engine).subscribe()

cherrypy.tree.mount(MyDaemonApp, "/")
cherrypy.engine.start()
cherrypy.engine.block()

There is a decent HOWTO for SysV style here.

To summarize:

1. Create a file named for your application in /etc/init.d that calls /bin/sh

   sudo vim /etc/init.d/MyDaemonApp

   #!/bin/sh  
   echo "Invoking MyDaemonApp";  
   /path/to/MyDaemonApp  
   echo "Started MyDaemonApp. Tremble, Ye Mighty."  
   

2. Make it executable

   sudo chmod +x /etc/init.d/MyDaemonApp

3. Run update-rc.d to create our proper links in the proper runtime dir.

   sudo update-rc.d MyDaemonApp defaults 80

4. sudo /etc/init.d/MyDaemonApp