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

It is all dynamic content going forward

scenarios where a cache flush would be required

1) an article is updated
2) category is updated with a list of articles.

we syndicate content to abut 150 partner and will have same
article/category with a different URL doesn't squid cache based on the
url?

when you update content on your cms - how does squid know to update it's cache?

JB

On Thu, Apr 21, 2011 at 12:10 PM, Ron Wheeler
<rwheeler_at_artifact-software.com> wrote:
> Are you sure that you need to do this?
> Squid should be able to tell the difference between static and dynamic
> content.
>
> We have a dynamic JSR-168/268 portal based on Tomcat and Jetspeed sitting
> behind Apache and Squid  and we have never had to intervene with Squid for 3
> years.
> We also have lots of Wordpress CMS sites.
>
> The user gets the latest information on every page load regardless of the
> URL being the same.
>
> What exactly would cause you to trigger a flush of the cache?
>
> Ron
>
>
> On 21/04/2011 11:30 AM, Jawahar Balakrishnan (JB) wrote:
>>
>> 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 - 16:31:54 MDT