On 21/12/2015 2:00 p.m., Alex Samad wrote: > Hi > > running on centos 6.7 > > 3.5.12 still not available on centos 6. > > rpm -qa | grep squid > squid-helpers-3.5.11-1.el6.x86_64 > squid-3.5.11-1.el6.x86_64 > > This is the 2 cache_peer statements I use > > # on alcdmz1 > cache_peer gsdmz1.yieldbroker.com sibling 3128 4827 proxy-only htcp > no-query standby=10 > #cache_peer alcdmz1.yieldbroker.com sibling 3128 4827 proxy-only htcp > no-query standby=10 > > # on gsdmz1 > #cache_peer gsdmz1.yieldbroker.com sibling 3128 4827 proxy-only htcp > no-query standby=10 > cache_peer alcdmz1.yieldbroker.com sibling 3128 4827 proxy-only htcp > no-query standby=10 > > on alcdmz1 with export http_proxy pointing to alcdmz1 > > wget -d http://fonts.gstatic.com/s/lato/v11/H2DMvhDLycM56KNuAtbJYA.woff2 > -O /dev/null > Setting --output-document (outputdocument) to /dev/null > DEBUG output created by Wget 1.12 on linux-gnu. > > --2015-12-21 11:58:05-- > http://fonts.gstatic.com/s/lato/v11/H2DMvhDLycM56KNuAtbJYA.woff2 > Resolving alcdmz1... 10.32.20.111 > Caching alcdmz1 => 10.32.20.111 > Connecting to alcdmz1|10.32.20.111|:3128... connected. > Created socket 4. > Releasing 0x000000000101d540 (new refcount 1). > > ---request begin--- > GET http://fonts.gstatic.com/s/lato/v11/H2DMvhDLycM56KNuAtbJYA.woff2 HTTP/1.0 > User-Agent: Wget/1.12 (linux-gnu) > Accept: */* > Host: fonts.gstatic.com > > ---request end--- > Proxy request sent, awaiting response... > ---response begin--- > HTTP/1.1 200 OK > Content-Type: font/woff2 > Access-Control-Allow-Origin: * > Timing-Allow-Origin: * > Date: Mon, 30 Nov 2015 04:06:16 GMT > Expires: Tue, 29 Nov 2016 04:06:16 GMT > Last-Modified: Mon, 06 Oct 2014 20:40:59 GMT > X-Content-Type-Options: nosniff > Server: sffe > Content-Length: 25604 > X-XSS-Protection: 1; mode=block > Cache-Control: public, max-age=31536000 > Age: 1803109 > Warning: 113 alcdmz1 (squid) This cache hit is still fresh and more > than 1 day old > X-Cache: HIT from alcdmz1 > X-Cache-Lookup: HIT from alcdmz1:3128 > Via: 1.1 alcdmz1 (squid) > Connection: close > > ---response end--- > 200 OK > Length: 25604 (25K) [font/woff2] > Saving to: `/dev/null' > > 100%[==============================================================================================>] > 25,604 --.-K/s in 0s > > Closed fd 4 > 2015-12-21 11:58:05 (1.01 GB/s) - `/dev/null' saved [25604/25604] > > > on gsdmz1 > > > wget -d http://fonts.gstatic.com/s/lato/v11/H2DMvhDLycM56KNuAtbJYA.woff2 > -O /dev/null > Setting --output-document (outputdocument) to /dev/null > DEBUG output created by Wget 1.12 on linux-gnu. > > --2015-12-21 11:58:59-- > http://fonts.gstatic.com/s/lato/v11/H2DMvhDLycM56KNuAtbJYA.woff2 > Resolving gsdmz1... 10.32.20.110 > Caching gsdmz1 => 10.32.20.110 > Connecting to gsdmz1|10.32.20.110|:3128... connected. > Created socket 4. > Releasing 0x00000000010a2930 (new refcount 1). > > ---request begin--- > GET http://fonts.gstatic.com/s/lato/v11/H2DMvhDLycM56KNuAtbJYA.woff2 HTTP/1.0 > User-Agent: Wget/1.12 (linux-gnu) > Accept: */* > Host: fonts.gstatic.com > > ---request end--- > Proxy request sent, awaiting response... > ---response begin--- > HTTP/1.1 504 Gateway Timeout > Server: squid > Mime-Version: 1.0 > Date: Mon, 21 Dec 2015 00:58:59 GMT > Content-Type: text/html;charset=utf-8 > Content-Length: 3964 > X-Squid-Error: ERR_ONLY_IF_CACHED_MISS 0 > Vary: Accept-Language > Content-Language: en > Age: 1450659540 > Warning: 113 alcdmz1 (squid) This cache hit is still fresh and more > than 1 day old > Warning: 110 squid "Response is stale" > Warning: 111 squid "Revalidation failed" > X-Cache: HIT from alcdmz1 > X-Cache-Lookup: HIT from alcdmz1:3128 > X-Cache: MISS from gsdmz1 > X-Cache-Lookup: MISS from gsdmz1:3128 > Via: 1.1 alcdmz1 (squid), 1.1 gsdmz1 (squid) > Connection: close > > ---response end--- > 504 Gateway Timeout > Closed fd 4 > 2015-12-21 11:58:59 ERROR 504: Gateway Timeout. > > > so why does it work from alc and not from gs ???
The alc fetch is going: client->alc->Internet/parent The gs fetch is going: client->gs->alc->Internet/parent This is shown in the Via headers. The alc sibling has a response cached which matches. But that required a revalidation. (The 113 and 110 Warning headers) The revalidation failed for some reason (the only-if-cached ?). So it output a 504 and sent that back to gs. (The 111 Warning header) There are several problems here: 1) why the revalidation is failing, and 2) why the gs peer is not re-trying the fetch via another server (parent or DIRECT) after the 504 happens. 3) The Age header says ~46yrs ago for the 504 being created, suspiciously close to 1 Jan 1970 / unix epoch 0-second. It seems to me you have managed to reproduce <http://bugs.squid-cache.org/show_bug.cgi?id=4223> Amos _______________________________________________ squid-users mailing list squid-users@lists.squid-cache.org http://lists.squid-cache.org/listinfo/squid-users
