> > Hey guys, > > I've got a proprietary web application what we use as a back end for > other applications, and I want to do some agressive caching using squid, > as a test, to reduce the load on the back end. > > I spent 2-3 days on googling and reading the archives, but nothing I do > or try seems to help! :( > > Here's the original back-end request (for one image in that app): > > ------------------------------------ > [angelo@zvr-web-04 ~]$ wget -S --spider > http://10.94.206.34:8000/stats_components/collapseon.gif > --00:19:07-- http://10.94.206.34:8000/stats_components/collapseon.gif > => `collapseon.gif' > Connecting to 10.94.206.34:8000... connected. > HTTP request sent, awaiting response... > HTTP/1.0 200 OK > Content-Type: image/gif > Content-Length: 64 > Length: 64 [image/gif] > 200 OK > ------------------------------------ > > As you can see, it's missing all cache headers, and expires and > last-modified header. > > This is how my squid config is (now running on 2.6STABLE16, tried on > 3.0RC1 too): > > ------------------------------------ > hierarchy_stoplist cgi-bin > acl QUERY urlpath_regex cgi-bin > > shutdown_lifetime 1 second > > acl all src 0.0.0.0/0.0.0.0 > cache allow all > > #400GB disk cache > cache_dir ufs /usr/local/squid/cache 409600 16 256 > > maximum_object_size 5 MB > cache_mem 1024 MB > cache_swap_low 90 > cache_swap_high 95 > maximum_object_size_in_memory 512 KB > > cache_replacement_policy heap LFUDA > memory_replacement_policy heap LFUDA > > http_port 8000 vhost vport > cache_peer 10.94.206.34 parent 8000 0 no-query originserver > > http_access allow all > > minimum_expiry_time 3600 seconds > refresh_pattern . 3600 100% 3600 ignore-no-cache ignore-reload > override-expire override-lastmod These ignore and overrides have no effect when the control headers are missing. As you noted from your app. > > access_log /var/log/squid/access.log squid > cache_log /var/log/squid/cache.log > cache_store_log /var/log/squid/store.log Um, since you have the store.log check it to see what squid is saving to the cache. > > strip_query_terms off > ------------------------------------ > > This was the most agressive config I could found, and I expect the > refresh_pattern line to force squid to cache.. > > But all my access.log file keeps saying is: > ------------------------------------ > 1215555215.645 1 127.0.0.1 TCP_MISS/200 200 HEAD > http://localhost:8000/stats_components/collapseon.gif - > FIRST_UP_PARENT/10.94.206.34 image/gif > 1215555217.096 92 127.0.0.1 TCP_MISS/200 200 HEAD > http://localhost:8000/stats_components/collapseon.gif - > FIRST_UP_PARENT/10.94.206.34 image/gif > 1215555217.940 1 127.0.0.1 TCP_MISS/200 200 HEAD > http://localhost:8000/stats_components/collapseon.gif - > FIRST_UP_PARENT/10.94.206.34 image/gif > 1215555218.718 2 127.0.0.1 TCP_MISS/200 200 HEAD > http://localhost:8000/stats_components/collapseon.gif - > FIRST_UP_PARENT/10.94.206.34 image/gif > ------------------------------------ > > And in the store.log: > ------------------------------------ > 1215555215.645 RELEASE -1 FFFFFFFF 98DDCD4857BAF3122EE99EB25E4C3800 200 > -1 -1 -1 image/gif 64/0 HEAD > http://localhost:8000/stats_components/collapseon.gif > 1215555217.096 RELEASE -1 FFFFFFFF A3AE2ED993B031DBD93CF74E2BD64BC5 200 > -1 -1 -1 image/gif 64/0 HEAD > http://localhost:8000/stats_components/collapseon.gif > 1215555217.940 RELEASE -1 FFFFFFFF FFFE8387EBAB471EC045EFA51F9AE472 200 > -1 -1 -1 image/gif 64/0 HEAD > http://localhost:8000/stats_components/collapseon.gif > 1215555218.718 RELEASE -1 FFFFFFFF EA490C98564ABDF390D216E2C3DC210E 200 > -1 -1 -1 image/gif 64/0 HEAD > http://localhost:8000/stats_components/collapseon.gif > ------------------------------------ > > > Does anyone ave any idea's on why Squid won't cache the requests? Squid can cache _objects_ but HEAD requests and GET requests are different. GET contains the object, HEAD does not. If you can get the front-end apps (or even your testing spider) to pull the full object into cache with a GET I suspect the MISS would reduce. Amos
