There are four possible deployment options for Windows:

  1. Run as a Windows service with a Python based web server like CherryPy or Twisted

  2. Run as a Windows service behind another web server (either IIS or Apache) using a reverse proxy

  3. Inside IIS using the WSGI bridge with ISAPI-WSGI

  4. Inside IIS using the WSGI bridge with PyISAPIe

Options 1 and 2: run as a Windows service

Both Options 1 and 2 are quite similar to running the development server, except that debugging info is turned off and you want to run the process as a Windows service.

Install dependencies

Running as a Windows service depends on the PyWin32 project. You will need to download the pre-built binary that matches your version of Python.

You can install directly into the virtualenv if you run easy_install on the downloaded installer. For example:

easy_install pywin32-217.win32-py2.7.exe

Since the web server for CherryPy has good Windows support, is available for Python 2 and 3, and can be gracefully started and stopped on demand from the service, we'll use that as the web server. You could also substitute another web server, like the one from Twisted.

To install CherryPy run:

pip install cherrypy

Create a Windows service

Create a new file called with the following code to define your service:

 1# uncomment the next import line to get print to show up or see early
 2# exceptions if there are errors then run
 3#   python -m win32traceutil
 4# to see the output
 5#import win32traceutil
 6import win32serviceutil
 9CONFIG_FILE = 'production.ini'
10SERVER_NAME = 'www.pyramid.example'
12SERVICE_NAME = "PyramidWebService"
13SERVICE_DISPLAY_NAME = "Pyramid Web Service"
14SERVICE_DESCRIPTION = """This will be displayed as a description \
15of the serivice in the Services snap-in for the Microsoft \
16Management Console."""
18class PyWebService(win32serviceutil.ServiceFramework):
19    """Python Web Service."""
21    _svc_name_ = SERVICE_NAME
22    _svc_display_name_ = SERVICE_DISPLAY_NAME
23    _svc_deps_ = None        # sequence of service names on which this depends
24    # Only exists on Windows 2000 or later, ignored on Windows NT
25    _svc_description_ = SERVICE_DESCRIPTION
27    def SvcDoRun(self):
28        from cheroot import wsgi
29        from pyramid.paster import get_app
30        import os, sys
32        path = os.path.dirname(os.path.abspath(__file__))
34        os.chdir(path)
36        app = get_app(CONFIG_FILE)
38        self.server = wsgi.Server(
39                ('', PORT_TO_BIND), app,
40                server_name=SERVER_NAME)
42        self.server.start()
45    def SvcStop(self):
46        self.server.stop()
49if __name__ == '__main__':
50    win32serviceutil.HandleCommandLine(PyWebService)

The if __name__ == '__main__' block provides an interface to register the service. You can register the service with the system by running:

python install

Your service is now ready to start, you can do this through the normal service snap-in for the Microsoft Management Console or by running:

python start

If you want your service to start automatically you can run:

python update --start=auto

Reverse proxy (optional)

If you want to run many Pyramid applications on the same machine you will need to run each of them on a different port and in a separate Service. If you want to be able to access each one through a different host name on port 80, then you will need to run another web server (IIS or Apache) up front and proxy back to the appropriate service.

There are several options available for reverse proxy with IIS. In versions starting with IIS 7, you can install and use the Application Request Routing if you want to use a Microsoft-provided solution. Another option is one of the several solutions from Helicon Tech. Helicon Ape is available without cost for up to 3 sites.

If you aren't already using IIS, Apache is available for Windows and works well. There are many reverse proxy tutorials available for Apache, and they are all applicable to Windows.

Options 3 and 4: Inside IIS using the WSGI bridge with ISAPI-WSGI

IIS configuration

Turn on Windows feature for IIS.

Control panel -> "Turn Windows features on off" and select:

  • Internet Information service (all)

  • World Wide Web Services (all)

Create website

Go to Internet Information Services Manager and add website.

  • Site name (your choice)

  • Physical path (point to the directory of your Pyramid porject)

  • select port

  • select the name of your website


Create bridging script

Create a file, and place it in your pyramid project:

 1# path to your site packages in your environment
 2# needs to be put in here
 3import site
 6# this is used for debugging
 7# after everything was installed and is ready to meka a http request
 8# run this from the command line:
 9# python -m python -m win32traceutil
10# It will give you debug output from this script
11# (remove the 3 lines for production use)
12import sys
13if hasattr(sys, "isapidllhandle"):
14    import win32traceutil
17# this is for setting up a path to a temporary
18# directory for egg cache.
19import os
20os.environ['PYTHON_EGG_CACHE'] = '/path/to/writable/dir'
22# The entry point for the ISAPI extension.
23def __ExtensionFactory__():
24    from paste.deploy import loadapp
25    import isapi_wsgi
26    from logging.config import fileConfig
28    appdir = '/path/to/your/pyramid/project'
29    configfile = 'production.ini'
30    con = appdir + configfile
32    fileConfig(con)
33    application = loadapp('config:' + configfile, relative_to=appdir)
34    return isapi_wsgi.ISAPIThreadPoolHandler(application)
36# ISAPI installation
37if __name__ == '__main__':
38    from isapi.install import ISAPIParameters, ScriptMapParams, VirtualDirParameters, HandleCommandLine
40    params = ISAPIParameters()
41    sm = [
42        ScriptMapParams(Extension="*", Flags=0)
43    ]
45    # if name = "/" then it will install on root
46    # if any other name then it will install on virtual host for that name
47    vd = VirtualDirParameters(Name="/",
48                              Description="Description of your proj",
49                              ScriptMaps=sm,
50                              ScriptMapUpdate="replace"
51    )
53    params.VirtualDirs = [vd]
54    HandleCommandLine(params)

Install your Pyramid project as Virtual Host or root feature

Activate your virtual env and run the stript:

python install --server=<name of your website>

Restart your website from IIS.