Deploying CherryPy (daemon)

Daemonizer can be pretty simple to use:

# this works for cherrypy 3.1.2 on Ubuntu 10.04from cherrypy.process.plugins import Daemonizer# before mounting anythingDaemonizer(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

There is a Daemonizer plugin for CherryPy included by default which is useful for getting it to start but by far the easiest way for simple cases is to use the cherryd script:

> cherryd -hUsage: cherryd [options]Options:  -h, --help            show this help message and exit  -c CONFIG, --config=CONFIG                        specify config file(s)  -d                    run the server as a daemon  -e ENVIRONMENT, --environment=ENVIRONMENT                        apply the given config environment  -f                    start a fastcgi server instead of the default HTTP                        server  -s                    start a scgi server instead of the default HTTP server  -i IMPORTS, --import=IMPORTS                        specify modules to import  -p PIDFILE, --pidfile=PIDFILE                        store the process id in the given file

As far as an init.d script goes I think there are examples that can be Googled.

And the cherryd is found in your:

virtualenv/lib/python2.7/site-packages/cherrypy/cherryd

or in: https://bitbucket.org/cherrypy/cherrypy/src/default/cherrypy/cherryd

I wrote a tutorial/project skeleton, cherrypy-webapp-skeleton, which goal was to fill the gaps for deploying a real-world CherryPy application on Debian* for a web-developer. It features extended cherryd for daemon privilege drop. There's also a number of important script and config files for init.d, nginx, monit, logrotate. The tutorial part describes how to put things together and eventually forget about it. The skeleton part proposes a way of possible arrangement of CherryPy webapp project assets.

* It was written for Squeeze but practically it should be same for Wheezy.