nginx caching

[Gabriel Ramuglia]

thanks, i didn't know that embedded perl could be used this way,
that's a great help.

2009/7/19 Igor Sysoev <is at rambler-co.ru>:
> On Sun, Jul 19, 2009 at 02:54:34AM -0700, Gabriel Ramuglia wrote:
>
>> Hi,
>>
>> I've been using nginx for a while now to proxy flv videos via youtube,
>> to good effect. However, the site that I'm accessing to proxy videos,
>> I'm having problems being able to access their site in bulk, so I've
>> decided to start caching things locally so as not to hit the remote
>> server so often. I'm doing this in squid, and, for a variety of
>> reasons, using the url_rewriter function to help out. My urls change
>> every hour, but the video they refer to does not, so I have to use the
>> rewriter to make sure the cache stays relevant.
>>
>> Now, the problem is, squid is using something like 60% of one core of
>> cpu doing something like 200 megabit / s of bandwidth. This is on top
>> of the fact that squid has to pass cache misses off to nginx, which is
>> using another 20% or so (of one core, again) cpu use. Obviously if I
>> could cut squid out of the equation this would be ideal.
>>
>> Is there a way in nginx to use the same functionality as the
>> url_rewriter in squid? Is there a tutorial or other helpful links on
>> doing caching in nginx?
>
> http://wiki.nginx.org/NginxHttpProxyModule#proxy_cache
>
> http {
>   proxy_cache_path   /spool/nginx/cache levels=1:2
>                      keys_zone=cache:10m
>                      inactive=3h;
>
>   server {
>
>       location / {
>           proxy_pass   ...;
>
>           proxy_cache            cache;
>           proxy_cache_valid      200 24h;
>           proxy_cache_use_stale  error timeout invalid_header updating
>                                  http_500 http_502 http_503 http_504;
>
>           proxy_ignore_headers   Expires Cache-Control;
>       }
>
> As to url_rewriter, it's depend on functionality: you may use simple
> "rewrite" or complex "perl_set":
> http://wiki.nginx.org/NginxEmbeddedPerlModule
>
>
> --
> Igor Sysoev
> http://sysoev.ru/en/
>
>