nginx-0.7.44

[Jérôme Loyet]

2009/3/24 Igor Sysoev <is at rambler-co.ru>:
> On Tue, Mar 24, 2009 at 05:07:23PM +0100, J?r?me Loyet wrote:
>
>> 2009/3/23 Igor Sysoev <is at rambler-co.ru>:
>> > On Mon, Mar 23, 2009 at 10:42:45PM +0800, Delta Yeh wrote:
>> >
>> >> How to use the cache feature?
>> >> What kind of cache does it support?
>> >
>> > Here is configuraiton example:
>> >
>> > http {
>> >     proxy_cache_path   /path/to/cache  levels=1:2
>> >                        keys_zone=NAME:10m
>> >                        inactive=5m     clean_time=2h00m;
>> >
>> >     server {
>> >         location / {
>> >             proxy_pass    http://127.0.0.1;
>> >
>> >             proxy_cache   NAME;
>> >
>> >             proxy_cache_valid   200 302  1h;
>> >             proxy_cache_valid   301      1d;
>> >             proxy_cache_valid   any      1m;
>> >
>> >             proxy_cache_min_uses  1;
>> >
>> >             proxy_cache_use_stale   error  timeout invalid_header http_500;
>> >         }
>> >     }
>> >
>> > The cache currently ignores backend's Cache-Control, Expires, etc.
>>
>> hi Igor,
>>
>> Do I understand correctly the proxy_cache_use_stale directive:
>>
>> proxy_cache_use_stale   error  timeout invalid_header http_500;
>>
>> If cache is still valid {
>>   serve content from cache
>> } else {
>>   Ask fresh data to the backend
>>   if connection status IS IN  (proxy_cache_use_stale parameters) {
>>       serve content from cache
>>   } else {
>>       act as normal
>>   }
>> }
>
> Yes.

Other question, how can I determine the maximum number of cache entrie
I have with a particular conf ?

proxy_cache_path  /data/nginx/cache  keys_zone=one:10m;

What is the size of keys on shared mem (X bytes). So that I can
extrapole the maximum number N of cache entries with YMo of shared
memory (N = (Y x 1024 x 1024) / X). (if there is nothing elese in the
shared mem and if the key size is constant)

Thx
++ jerome