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4 messages in ru.sysoev.nginxRe: Can't make nginx to cache| From | Sent On | Attachments |
|---|---|---|
| Mirosław Jaworski | Jul 21, 2009 8:03 am | |
| Gabriel Ramuglia | Jul 21, 2009 12:29 pm | |
| Mirosław Jaworski | Jul 23, 2009 5:51 am | |
| Maxim Dounin | Jul 23, 2009 6:15 am |
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| Subject: | Re: Can't make nginx to cache | Actions... |
|---|---|---|
| From: | Mirosław Jaworski (mj...@ikp.pl) | |
| Date: | Jul 23, 2009 5:51:42 am | |
| List: | ru.sysoev.nginx | |
On Tue, 2009-07-21 at 12:29 -0700, Gabriel Ramuglia wrote:
Edit your php script to send caching headers
"X-Powered-By: PHP/5.2.6-2ubuntu4.2"
PHP by default does not send headers that would cause a browser or cache to decide that a result was cachable. This makes sense, as php is a dynamic language and the same url could return something dramatically different every time.
I find this explanation very unlikely: - nginx source doesn't show any dependence on (not) caching based on X-Powered-By header - nginx can ignore caching-specific headers ( proxy_ignore_headers ), X-Powered-By is not on the list - it doesn't cache static files too:
Direct connect to backend:
$ telnet 192.168.10.18 80 Trying 192.168.10.18... Connected to 192.168.10.18. Escape character is '^]'. GET /test.html HTTP/1.1 Host: www.xyz.pl
HTTP/1.1 200 OK Date: Thu, 23 Jul 2009 11:52:23 GMT Server: Apache/2.2.9 (Ubuntu) PHP/5.2.6-2ubuntu4.2 with Suhosin-Patch mod_ssl/2.2.9 OpenSSL/0.9.8g Last-Modified: Thu, 23 Jul 2009 11:52:10 GMT ETag: "cca18-5-46f5e1e220e80" Accept-Ranges: bytes Content-Length: 5 Vary: Accept-Encoding Content-Type: text/html
test Connection closed by foreign host.
Connect to frontend ( nginx ): $ telnet A.B.C.D 80 Trying A.B.C.D... Connected to A.B.C.D. Escape character is '^]'. GET /test.html HTTP/1.1 Host: www.xyz.pl
HTTP/1.1 200 OK Server: nginx Date: Thu, 23 Jul 2009 11:55:00 GMT Content-Type: text/html Connection: keep-alive Last-Modified: Thu, 23 Jul 2009 11:52:10 GMT ETag: "cca18-5-46f5e1e220e80" Accept-Ranges: bytes Content-Length: 5 Vary: Accept-Encoding
test Connection closed by foreign host.
Cache is still empty.
- last but not least, my initial post didn't come from some single object testing, it's a tiny part of broader picture, which is: - old environment - squid as caching reverse proxy, lots of caching ( without it old environment would be dead due to lack of backends capacity ) - some virtual machines ( backends ) with numerous web services with tens of thousands documents, including thousands of static files ( graphics css js ) with noticeable traffic ( billions visits per month ) - new environment - nginx as caching(?) reverse proxy - 1:1 copy of all virtual machines from 'old environment' - new environment receives production traffic for couple days already - anytime i check it, nginx cache has _zero_ objects inside ( there's not even one nested directory inside cache path it should create )
Therefore i believe i lack something to effectively turn the caching on.
Regards
MJ
-- Mirosław "Psyborg" Jaworski GCS/IT d- s+:+ a C++$ UBI++++$ P+++$ L- E--- W++(+++)$ N++ o+ K- w-- O- M- V- PS+ PE++ Y+ PGP t 5? X+ R++ !tv b++(+++) DI++ D+ G e* h++ r+++ y? "Experience is a good school, but the fees are high."