Re: [squid-users] Re: Squid Cache flush

I would rather not do a restart of anything unless absolutely required

Here are the challenges we face

1) We are trying to deploy Suqid as a reverse-proxy in front of a CMS
2) We want to trying find a balance between keeping the content fresh
without affecting performance by frequently expiring content.

Our current reverse proxy solution allow us to flush the entire cache
without having to restart but in limited testing Squid seemed to
perform much better and we would prefer to use Squid but still retain
the functionality of being able to flush the entire cache periodically
via cron or when in case of an emergency.

Cache-control headers are fine and will work in case of limited number
of objects.

Thanks
JB

On Tue, Apr 19, 2011 at 7:27 PM, Amos Jeffries <squid3_at_treenet.co.nz> wrote:
> On Tue, 19 Apr 2011 11:14:55 -0400, Jawahar Balakrishnan (JB) wrote:
>>
>> I am looking to deploy Squid as a reverse proxy and i had couple of
>> questions. We currrently use Bluecoat and Sun Web proxy and i am able
>> to do the following things
>>
>> 1) How would i flush objects from cache?
>
> The whole lot:
>  http://wiki.squid-cache.org/SquidFaq/ClearingTheCache
>
> or individually via:
>  HTTP "PURGE" requests
>  HTCP "CLR" requests
>
>  squidpurge tool commands.
>
>
>> 2) Can i flush the entire cache without restarting Squid?
>
> Yes ... but it takes a LONG time to do N objects individually.
> Restart without a cache to load takes milliseconds.
>
>> 3) Can i set the configuration to expire objects at a certain time
>> every day regardless of when the object was cache during the previous
>> 24 hours?
>
> Use of the Expiry and Cache-Control mechanisms properly can do just about
> anything. Correct use will make all proxies not just your reverse one handle
> the site fine and remove a lot of customer problems.
>
> Objects which arrive with header "Expires: XX" will expire at XX timestamp
> and be replaced on their next use.
>
>
>
> Amos
>
>
Received on Thu Apr 21 2011 - 15:31:06 MDT