# Purge files from proxy\_cache **URL:** \ **Category:** NGINX\ **Created:** [April 13, 2012, 9:38am UTC](https://www.ruby-forum.com/t/purge-files-from-proxy-cache/218837 "2012-04-13T09:38:28Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Gurdipe\_D](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/b77776/32.png) [@Gurdipe\_D](https://www.ruby-forum.com/u/Gurdipe_D)\ **Post date:** [April 13, 2012, 9:38am UTC](https://www.ruby-forum.com/t/purge-files-from-proxy-cache/218837/1 "2012-04-13T09:38:28Z")
Hi, i’ve set a proxy cache for my app ( app is allso served by nginx ). My problem is that i would like to have my app control the cache a little bit so i have hooks that delete files whith keys matching certain paths when some events in the app take place. This also works ok but the problem is that during stress testing if i remove a file from the nginx cache i get a lot of php-fpm processes stampeeding to generate that file in the cache. I would like to mention that i am using proxy\_cache\_use\_stale updating in order to prevent stampeeding when nginx needs to rebuild cached pages that have expired naturally but that won’t help when i remove them from the cache myself. Question is … how can i make certain pages expire when the application decides they need to be refreshed ? or … how can i safely delete them and not have a php riot ? Posted at Nginx Forum: > **[Purge files from proxy\_cache](https://forum.nginx.org/read.php?2,225281,225281#msg-225281)** > > Hi, i've set a proxy cache for my app ( app is allso served by nginx ). My problem is that i would like to have my app control the cache a little bit so i have hooks that delete files whith keys matching certain paths when some events in the app take... ---
**Author:** ![mlmarius](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/dec6dc/32.png) [@mlmarius](https://www.ruby-forum.com/u/mlmarius)\ **Post date:** [April 13, 2012, 9:43am UTC](https://www.ruby-forum.com/t/purge-files-from-proxy-cache/218837/2 "2012-04-13T09:43:26Z")
> that have expired naturally but that won’t help when i remove them from > the cache myself. > > Question is … how can i make certain pages expire when the application > decides they need to be refreshed ? or … how can i safely delete them > and not have a php riot ? Either use this: [GitHub - FRiCKLE/ngx\_cache\_purge: nginx module which adds ability to purge content from FastCGI, proxy, SCGI and uWSGI caches. · GitHub](https://github.com/FRiCKLE/ngx_cache_purge) Or just delete the file. This could be handy in that case: > **[GitHub - perusio/nginx-cache-purge: A bash script for deleting items from Nginx cache](https://github.com/perusio/nginx-cache-purge)** > > A bash script for deleting items from Nginx cache –appa ---
**Author:** ![mlmarius](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/dec6dc/32.png) [@mlmarius](https://www.ruby-forum.com/u/mlmarius)\ **Post date:** [April 13, 2012, 10:08am UTC](https://www.ruby-forum.com/t/purge-files-from-proxy-cache/218837/3 "2012-04-13T10:08:56Z")
## Antonio P.P. Almeida Wrote: > > cache i get a lot of php-fpm processes > > that case: > > [GitHub - perusio/nginx-cache-purge: A bash script for deleting items from Nginx cache · GitHub](https://github.com/perusio/nginx-cache-purge) > > –appa > > * * * > > nginx mailing list > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) Well … i kind of figured out how to actually delete the files from the cache by greping for certain key patterns so i am able to actually remove them. The problem is that right after i remove them nginx will try to rebuild them and at 1000 req/s a lot of php-php processes will come up to try and generate the missing cache page which will cause a drop in the reqs’s ( i think requests start getting http error pages actually ). So that is my problem … the fact that i have no control over how uncached pages are created. I would like just 1 process to generate the missing page and the others to wait for it to be available or something. I guess i’m looging for the functionality that proxy\_cache\_use\_stale updating adds but for missing files. That will only keep me safe from updating of cached and expired pages. Posted at Nginx Forum: [http://forum.nginx.org/read.php?2,225281,225285#msg-225285](http://forum.nginx.org/read.php?2,225281,225285#msg-225285) ---
**Author:** ![mlmarius](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/dec6dc/32.png) [@mlmarius](https://www.ruby-forum.com/u/mlmarius)\ **Post date:** [April 13, 2012, 10:17am UTC](https://www.ruby-forum.com/t/purge-files-from-proxy-cache/218837/4 "2012-04-13T10:17:38Z")
> proxy\_cache\_use\_stale updating > > adds but for missing files. That will only keep me safe from updating of > cached and expired pages. > **[Module ngx\_http\_proxy\_module](http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_lock)** > > The ngx\_http\_proxy\_module module allows passing requests to another server. > **[Module ngx\_http\_fastcgi\_module](http://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_cache_lock)** > > The ngx\_http\_fastcgi\_module module allows passing requests to a FastCGI server. –appa