# Nginx proxy cache/temp folders empty when located inside /tmp on CentOS 7 **URL:** \ **Category:** NGINX\ **Created:** [April 6, 2016, 6:40am UTC](https://www.ruby-forum.com/t/nginx-proxy-cache-temp-folders-empty-when-located-inside-tmp-on-centos-7/244411 "2016-04-06T06:40:17Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Post date:** [April 6, 2016, 6:40am UTC](https://www.ruby-forum.com/t/nginx-proxy-cache-temp-folders-empty-when-located-inside-tmp-on-centos-7/244411/1 "2016-04-06T06:40:17Z")
(First post in the Nginx forum, so please bear with me if it seems slightly long…) I’m the maker of Engintron, a popular cPanel plugin which integrates Nginx as a reverse caching proxy in front of Apache. The project started in Dec 2014, it is open source & free and you can check out the code here, including Nginx configuration files: > **[GitHub - engintron/engintron: Engintron for cPanel/WHM is the easiest way to...](https://github.com/engintron/engintron)** > > Engintron for cPanel/WHM is the easiest way to integrate Nginx on your cPanel/WHM server. Engintron will improve the performance & web serving capacity of your server, while reducing CPU/RAM lo... In Feb 2016 I rewrote the plugin from scratch using a more efficient universal proxy configuration in Nginx, for any domain hosted on a cPanel server. The benefit is that you install Engintron on your cPanel server and it just works, with zero maintenance and no vhost sync’ing between Nginx & Apache like similar plugins for cPanel. I am defining 2 proxy cache zones/pools plus a proxy temp location in /etc/nginx/nginx.conf like this: proxy\_cache\_path /tmp/engintron\_dynamic levels=1:2 keys\_zone=engintron\_dynamic:20m inactive=10m max\_size=500m; proxy\_cache\_path /tmp/engintron\_static levels=1:2 keys\_zone=engintron\_static:20m inactive=10m max\_size=500m; proxy\_temp\_path /tmp/engintron\_temp; Nginx does 1 min caching for static assets like CSS, JS, images etc. and 1 sec micro-caching for dynamic/HTML content. The latter is used so that it doesn’t break sites with user-generated content such as forums, e-commerce sites etc. In CentOS versions 5 & 6, the folders referenced above will start filling up when Nginx is installed via Engintron, as Nginx caching kicks in. In CentOS 7 however - and this has been verified in multiple cPanel installations on my end, as well as other Engintron users via the project’s Issues section on GitHub- the above folders are just empty. However caching DOES work in CentOS 7, at least according to the headers sent by Nginx as well as by checking a static file if it gets cached. For example if I modify this CSS file [http://www.benetomaretti.com/templates/vp\_merchant/css/template.css](http://www.benetomaretti.com/templates/vp_merchant/css/template.css) I won’t see any changes until a minute has passed (1 min static cache). So the file does indeed get cached by Nginx, but the cache entry does not appear in the proxy cache/temp folders. These folders show up as empty with a simple du command. And if you check the same file via curl, you get something like this: $ curl -I [http://www.benetomaretti.com/templates/vp\_merchant/css/template.css](http://www.benetomaretti.com/templates/vp_merchant/css/template.css) HTTP/1.1 200 OK Server: nginx Date: Wed, 06 Apr 2016 04:27:52 GMT Content-Type: text/css Content-Length: 45237 Connection: keep-alive Vary: Accept-Encoding Last-Modified: Wed, 06 Apr 2016 04:25:52 GMT ETag: “45a86635-b0b5-52fc95b6d4120” Expires: Fri, 06 May 2016 04:27:52 GMT Cache-Control: max-age=2592000 X-Cache-Status: HIT X-Server-Powered-By: Engintron Pragma: public Cache-Control: public Vary: Accept-Encoding Accept-Ranges: bytes I’m really out of ideas why on earth there’s this behaviour with CentOS 7 specifically. Any pointers would be appreciated. For the record, the (re-written) release of Engintron in Feb 2016 already has more than 1300 server deployments in 72 countries worldwide. It’s in my plans to also get anonymous system metrics at some point in the near future, so I know which CentOS version is used (along with other data such Apache version, MySQL version etc.). In the meantime I can’t know what percentage uses CentOS 7, but judging from the fact that new cPanel deployments usually get setup on CentOS 7, I’m assuming the percentage may be high overall. Thanks in advance for any help or guidance. Posted at Nginx Forum: > **[Nginx proxy cache/temp folders empty when located inside /tmp on CentOS 7](https://forum.nginx.org/read.php?2,265943,265943#msg-265943)** > > (First post in the Nginx forum, so please bear with me if it seems slightly long...) I'm the maker of Engintron, a popular cPanel plugin which integrates Nginx as a reverse caching proxy in front of Apache. The project started in Dec 2014, it is open... ---
**Author:** ![fevangelou](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/c77e96/32.png) [@fevangelou](https://www.ruby-forum.com/u/fevangelou)\ **Post date:** [April 6, 2016, 9:33am UTC](https://www.ruby-forum.com/t/nginx-proxy-cache-temp-folders-empty-when-located-inside-tmp-on-centos-7/244411/2 "2016-04-06T09:33:12Z")
Hi, This gives a good explanation of what you are observing: > **[Red Hat Security](https://www.redhat.com/en/blog/channel/security)** > > Discover how we reduce risk in any environment and across the open source ecosystem Kind Regards Andrew On 06/04/16 05:39, fevangelou wrote: > server. The benefit is that you install Engintron on your cPanel server and > proxy\_temp\_path /tmp/engintron\_temp; > Issues section on GitHub- the above folders are just empty. > > Vary: Accept-Encoding > > such Apache version, MySQL version etc.). In the meantime I can’t know what > [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > [mailman.nginx.org archive](http://mailman.nginx.org/mailman/listinfo/nginx) – Andrew H. (LinuxJedi) Technical Product Manager, NGINX Inc. ---
**Author:** ![fevangelou](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/c77e96/32.png) [@fevangelou](https://www.ruby-forum.com/u/fevangelou)\ **Post date:** [April 7, 2016, 3:37pm UTC](https://www.ruby-forum.com/t/nginx-proxy-cache-temp-folders-empty-when-located-inside-tmp-on-centos-7/244411/3 "2016-04-07T15:37:08Z")
Awesome. Thank you 🙂 Posted at Nginx Forum: > **[Re: Nginx proxy cache/temp folders empty when located inside /tmp on CentOS 7](https://forum.nginx.org/read.php?2,265943,265986#msg-265986)** > > (First post in the Nginx forum, so please bear with me if it seems slightly long...) I'm the maker of Engintron, a popular cPanel plugin which integrates Nginx as a reverse caching proxy in front of Apache. The project started in Dec 2014, it is open...