Multple rails sites in IIS?

Topics: Developer Forum, User Forum
Aug 17, 2007 at 11:58 PM
I would like to setup multiple rails sites (not multiple Virtual directories as some demos have shown). Is this possible? I have several different webapps (running off entirely different domains & sub domains). Anyone got any ideas?

Oct 10, 2007 at 7:01 PM
Hi Josh,

The Microsoft IIS team has released their FCGI ISAPI module go-live (meaning production beta) and I am in the process of testing it. If things work as expected, I plan in the future to replace the current isapi fcgi library with the IIS one.

Here is a link to the site:

Jan 17, 2008 at 10:44 PM
Is there any updated documentation on deploying multiple rails sites sites (on different ports) with the current version? Any information would be greatly appreciated.

Jan 18, 2008 at 12:21 AM
Hey Jon,

I appreciate you asking. Here are the steps for what its worth...
Also note: there is a bug in the isapi_fcgi.dll implementation that I have yet to repair. Assume the following scenario:

(where StartServers = X is the setting in the cooresponding instance's .fcgX registry key)
First Server: StartServers = 2 ruby processes
Second Server: StartServers = 3 ruby processes

When each app runs for the first time:
First Server will spawn 2+3 processes.
Second Server will spawn 2+3 processes.

Now assume you had a Third Server: StartServers = 5 ruby procs
First Server will spawn 235 processes.
Second Server will spawn the same as well as the third.

For a total of 30 ruby processes. I haven't done any extensive testing on the behavior of these "orphaned" ruby procs but it can't be good. So if you use 1 or 2 per instance you will probably be ok depending upon the load requirements of your server.

I plan to fix this bug in the near future (within a month or so) as soon as I do I will post the new version of the installer.

Hope this helps you out,

Instructions for running multiple (rails) servers on same machine using FCGI.

- Note: fcgx denotes that the x is a number. (eg. fcg2, fcg3 etc...) cooresponding with the number of the server instances.

- Make a copy of the IsapiRewrite4.ini and the IsapiRewrite4.dll isapi filters
- they are located in c:\windows\syswow64\inetsrv (x64) and c:\windows\system32\inetsrv (x32)
- create a new subfolder under c:\windows\syswow64\inetsrv\fcgX (x64)
- copy the original files into the new subfolder

- Edit the IsapiRewrite4.ini
- Ensure you change the bind path to Rails-FCGIX (where X denotes the instance)
- Change any references to .fcgi to .fcgX and save it

- Start - Run - Regedit
- save a copy of the HKLM\SOFTWARE\Fast-CGI\.fcgi (note x64 - HKLM\SOFTWARE\Wow6432Node\Fast-CGI) to your desktop
- edit the file changing cooresponding paths and extensions to .fcgX
- save the file and import the changes to the registry

- Create a new website under IIS admin
- Assign it a name
- browse to new applicationX directory/public
- Create a new appliation pool if you wish
- assign app pool to new website under its properties
- set log file path to applicationX/log directory for IIS logs (optional)

- Add rewrite Isapi Filter to new website (where X denotes your instance number)
- name it REWRITE
- x64 - browse to C:\WINDOWS\SysWOW64\inetsrv\fcgX\IsapiRewrite4.dll
- x32 - browse to C:\WINDOWS\System32\inetsrv\fcgX\IsapiRewrite4.dll

- Add extension mapping for new .fcgX extension (note see manual IIS installation instructions for more info)
- Home Directory tab, Configuration button
- Add application extension
- x64 - browse to C:\WINDOWS\SysWOW64\inetsrv\isapi_fcgi.dll
- set extesion to .fcgX

- Navigate to applicationX install directory/public and rename dispatch.fcgi to dispatch.fcgX

- Restart IIS

Jan 18, 2008 at 4:49 AM
I was getting pretty close and didn't realize it.
Thanks for the details.


May 20, 2008 at 1:49 PM
any news on this process ophaning issue?

May 20, 2008 at 7:26 PM
Hi Josh,

I have ideas what is causing the orphaned ruby processes but no time to fix it as of yet.  We were using isapi_fcgi internally but have since moved away from ROR apps because of this limitation.  I recommend looking into running apache on windows instead of IIS.

If you know any c++ devs or want to go for it yourself, I can send you the source code for the isapi module, i'm sure its a pretty easy fix I just can't justify the time to do it right now.

Let me know if you want the sorce.