Losing POST data on vanilla Ubuntu/nginx/mongrel install

[Aaron Starr]

Maxim Dounin and Dave Cheney,

Thank you for your help. I've acquired lsof and ngrep and set the
logging level to debug for nginx, and now -- of course -- it seems to
be working perfectly. Aaaagh!

As soon as it quits sending POST data, I'll collect all the
information you suggested, and if I can't find anything untoward, I'll
post it here.

Thanks, again, sincerely.

Aaron


On Sun, Apr 5, 2009 at 3:56 AM, Maxim Dounin <mdounin at mdounin.ru> wrote:
> Hello!
>
> On Sat, Apr 04, 2009 at 03:55:31PM -0700, Aaron Starr wrote:
>
>> Maxim Dounin,
>>
>> Thanks for your response!
>>
>> I have several G on the logs volume, so for that reason it's probably
>> not a disk space issue.
>>
>> Also, though, the log file thing seems to have been a red herring. I
>> just went and tried the POST, again, having made no changes at all
>> since last time, and it's not working, again. And the log files are
>> small.
>>
>> So, it seems that nginx randomly starts stripping POST data when
>> proxying to mongrel. I can't be the first person who's seen something
>> like this! I really don't think I've done anything unusual.
>>
>> Can anyone think of a reason why POST data might be stripped when proxying?
>
> First of all, try looking into error_log.  If it doesn't help -
> obtain debug log and post it here together with config.
>
> Maxim Dounin
>
>
>>
>> Thanks for any ideas!
>>
>> Aaron
>>
>>
>>
>> On Sat, Apr 4, 2009 at 7:38 AM, Maxim Dounin <mdounin at mdounin.ru> wrote:
>> > Hello!
>> >
>> > On Sat, Apr 04, 2009 at 12:49:13AM -0700, Aaron Starr wrote:
>> >
>> >> Update on the missing POST data when proxying to mongrel:
>> >>
>> >> This seems crazy, but it seems to me that the problem is related to
>> >> having very large, un-rotated nginx log files. I noticed that the
>> >> files were getting too large, and removed them (and got logrotate set
>> >> up), and now I get my POST data, again.
>> >>
>> >> If anyone could confirm or deny this apparently nonsensical
>> >> explanation, that would be appreciated.
>> >
>> > Probably you have no space left for files in client_body_temp_path
>> > - and as soon as you removed large old logs there are space and
>> > everything is working again.
>> >
>> > Guess you have nothing in error_log due to the very same reason -
>> > no space left on device.
>> >
>> > Maxim Dounin
>> >
>> >>
>> >> Aaron
>> >>
>> >>
>> >> On Fri, Apr 3, 2009 at 2:22 PM, Aaron Starr <astarr at wiredquote.com> wrote:
>> >> > Hi, all. Sorry in advance for what is hopefully a simple question.
>> >> >
>> >> > I'm using nginx as a reverse-proxy for a few mongrel instances. Using
>> >> > AJAX (XMLHttpRequest), I POST a small bit of JSON to the server. The
>> >> > request is properly proxied to mongrel, but with the POST data
>> >> > missing!
>> >> >
>> >> > [..]
>> >>
>> >
>> >
>>
>
>