Em 30/09/15 04:13, Matus UHLAR - fantomas escreveu:
the problem was iirc in caching partial objects
http://wiki.squid-cache.org/Features/PartialResponsesCaching
that problem could be avoided with properly setting range_offset_limit
http://www.squid-cache.org/Doc/config/range_offset_limit/
but that also means that whole files instead of just their parts are
fetched.
it's quite possible that microsoft changed the windows updates to be
smaller
files, but I don't know anything about this, so I wonder if you really do
cache windows updates, and how does the caching work related to
informations
above...
yes, i'm definitely caching windows update files !!
[root@firewall ~]# cd /var/squid/
[root@firewall squid]# for i in `find . -type f`; do strings $i | head
-3 | grep "http://";; done | grep windowsupdate | wc -l
824
and yes, i had to configure range_offset_limit:
range_offset_limit 500 MB updates
minimum_object_size 500 KB
maximum_object_size 500 MB
quick_abort_min -1
(being 'updates' the ACL with the URLs to be cached, basically
windowsupdate and avast definition updates - the second one required
further tweaks with storeid_rewrite for the CDN URLs)
from access.log, i see a lot of TCP_HIT/206 (and just a few
TCP_HIT/200), so it seems squid is able to get the fully cached file and
provide the smaller pieces requested:
[root@firewall squid]# grep "TCP_HIT/" access.log | grep windowsupdate |
wc -l
9860
[root@firewall squid]# bzcat access.log.20150927.bz2 | grep "TCP_HIT/" |
grep windowsupdate | wc -l
38584
having squid to download the WHOLE file at the very first request
(even a partial request) may be bad, but considering it will be used
later to provide the data for other requests, even partial ones, make
things a little better.
(this windowsupdate caching is running just for a few weeks, i expect
HITs to grow a little more)
--
Atenciosamente / Sincerily,
Leonardo Rodrigues
Solutti Tecnologia
http://www.solutti.com.br
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