sendfile fails from livecd

[Igor Sysoev]

On Fri, Mar 06, 2009 at 06:18:17PM +0000, J.p. Lien wrote:

> My company makes an rails app that we serve using nginx.  I'm trying to make a
> livecd that we can use distribute the app to customers.  This has gone
> remarkably smoothly so far, with one small sticking point.  When booted from the
> CD, nginx serves the rails content just fine, but won't serve any images.  I get:
> 
> ------
> 2009/03/06 18:13:43 [crit] 7474#0: *1 sendfile() failed (22: Invalid argument)
> while sending response to client, client: 192.168.1.147, server: ubuntu, URL:
> "/images/chart_ignored_hover.gif", host: "192.168.1.113", referrer:
> "http://192.168.1.113/stylesheets/application.css?1233944282"
> 2009/03/06 18:14:16 [crit] 7474#0: *2 sendfile() failed (22: Invalid argument)
> while sending response to client, client: 192.168.1.147, server: ubuntu, URL:
> "/images/bug.png", host: "192.168.1.113"
> -------
> 
> The permissions on the images directory are right, and it will serve other
> static content (e.g. public/404.html).  If I edit the config file and set
> "sendfile" to "off", the images show up.  My best guess is that some system
> config file is getting mangled, or that something is being mounted differently.
>  Can anyone offer a suggestion as to what I should look at next?  I checked the
> (english) documentation, and I can't figure out what enabling sendfile does or
> why I would want to use it anyway.
> 
> Some details:
> nginx version is nginx/0.5.33.  OS is ubuntu 8.04, kernel version is 2.6.24-23.
>  LiveCD is using casper, and mounting / using unionfs.  error_log level is at debug.

It seems that Linux unionfs does not support sendfile():
http://www.google.com/search?q=linux+sendfile+unionfs


-- 
Igor Sysoev
http://sysoev.ru/en/