Re: [squid-users] Refresh pattern, understanding age

Hi,
given the massive amount of replies to my post (i.e. none), I'll answer
it myself just in case someone is interested. I eventually understood by
re-reading for the 100th time the refresh_pattern docs and by trial and
error that:

Min_age ensures freshness
Max_age ensures staleness

Therefore for the behaviour I'm after which is 'keep anything in cache
for x amount of time no matter what', the following pattern works:

        refresh_pattern . x 100% x ignore-reload override-lastmod \
        override-expire

While the refresh_pattern i started with (min_age = 0, max_age = x)
ensured that objects were stale after x, but not that they were fresh
before x.

Anyway that's the way I see it. If I just said something silly please
correct me.

Cheers, Eb.

Eric Blanchi wrote:
> Hi,
> just re-prompting this question:
> 1. Is it possible to achieve the behaviour described below?
> 2. If so would either refresh pattern work to achieve it:
> refresh_pattern . 0 100% 100 ignore-reload override-lastmod \
> override-expire
> refresh_pattern . 100 100% 100 ignore-reload override-lastmod \
> override-expire
>
> Cheer, Eb.
>
> Eric Blanchi wrote:
>
>> Hi,
>> I'm not sure I understand the refresh_pattern parameters so I was
>> wondering if someone could confirm this.
>>
>> I'm using Squid as a reverse proxy. I would like to keep pages in the
>> cache for a certain amount of time, irrelevant from any creation date,
>> last modified date or expiry date.
>>
>> Say for example keep everything for 100 minutes in the cache.
>> I would like to obtain the following behaviour:
>>
>> - client hits reverse proxy, item is not in cache.
>> - proxy fetches from actual source and caches the object.
>> - For the next 100 minutes any request will only hit the cache.
>> - client hits after 100 minutes (e.g. 101), proxy sees page as stale,
>> fetches from actual source, re-caches the object for another 100 mins.
>>
>> Is the following line correct:
>>
>> refresh_pattern . 0 100% 100 ignore-reload override-lastmod \
>> override-expire
>>
>

-- 
Eric B. Blanchi