tmp directory filling up

[Andrei Belov]

On 11 Jun 2014, at 23:23, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
> 
> On Wed, Jun 11, 2014 at 10:58:47AM -0400, Tatonka wrote:
> 
>> Hi, 
>> 
>> I have a rails application that is hosted through nginx and passenger. In
>> this application I want provide very large files for the users to download
>> (>2GB) using send_file .. which is working just fine on the development and
>> staging system. On the production system however the system tmp directory is
>> limited to 1GB (separately mounted disk). 
>> 
>> When triggering a download, the tmp folder quickly fills up and the download
>> breaks once it is completely full. I already moved passengers /tmp directory
>> to a new location but could find how to do the same for nginx (I did set
>> $tmp and $tmpdir with no effect). 
>> 
>> When looking into the /tmp directory however, I cannot find any large files
>> that would explain what is happening, nevertheless, df reports it is filling
>> up at the same time .. 
>> 
>> Lastly .. I also specified the proxy_temp_path directive in the nginx
>> config. Again with no effect. 
> 
> The proxy_temp_path is related to the problem, but it's for proxy, 
> not for passenger, and it's expected that it has no effect in your 
> case.
> 
>> Is there any way to specify which directory nginx uses for its tmp data? Is
>> nginx even the culprit here?
> 
> That's not about nginx, but rather about passenger module for 
> nginx.
> 
> Last time I checked, passenger module for nginx implemented its 
> own protocol for the upstream module (like proxy/fastcgi/etc), and 
> should have its own "..._temp_path" directive, as well as 
> "..._max_temp_file_size" and so on.

It’s still true:

https://github.com/phusion/passenger/blob/master/ext/nginx/Configuration.c#L55-L57

It uses NGX_HTTP_PROXY_TEMP_PATH which is set at configure stage.