You can purge the complete content of the cache, just have to Clear the swap.state file and restart squid. echo "" > /var/cache/squid/swap.state Hope this helps. Regards, Pablo On 7/12/07, martin sarsale <runa@xxxxxxxxxxxx> wrote:
Kinkie wrote: > On 7/2/07, martin sarsale <runa@xxxxxxxxxxxx> wrote: >> Dear all: >> We're developing the new version of our CMS and we would like to use >> squid in accelerator mode to speed up our service. >> >> From the application side, we know exactly when the data changed and we >> would like to invalidate all cached data for that site. Is this >> possible? maybe using squidclient or something. >> >> We can't do this purging url by url since it doesn't makes much sense >> (and we don't have the url list!). We want to wipe out every cached >> object for mysite.com. > > You can't do that on the squid side either, since squid doesn't index > objects by URL but by hash. The only way is to PURGE the relevant > object. > > You can reduce quite a lot the window of staleness by specifying in > every response the HTTP header: > > Cache-Control: s-maxage=XXX, public, proxy-revalidate > > (reference taken from: http://www.mnot.net/cache_docs/) > by choosing the right XXX value (the time in seconds before the object > expires) you'll be able to find the right balance between higher load > on the backend (smaller values of XXX) and higher chance of serving > stale content (higher values of XXX) (sorry for the delay) I understand what you are proposing with that header but IMHO that's valid for a 'dumb' system who cannot determine when it was modified. Since my system has this feature (I know the exact date the content as altered) I would like to let Squid handling ALL the work except when is really needed. I understand about object hashes... does it hashes the full URL (ie, including domain?) because if domain was hashed separately I could purge the entire domain hash. Any other hints? unofficial patches? alternative products? squid forks? thanks
