I'm suspecting Apache's closing a keep-alive connection because it and Varnish didn't agree on the timeout. Can you check? (in varnish, the param is called backend_idle_timeout)
-- Guillaume Quintard On Wed, Mar 29, 2017 at 10:12 AM, Hazar Güney <[email protected]> wrote: > Backend is Apache. > > On Wed, Mar 29, 2017 at 10:34 AM, Guillaume Quintard < > [email protected]> wrote: > >> Indeed, looking at the Timestamp lines, it's not a timeout. What's your >> backend? >> >> -- >> Guillaume Quintard >> >> On Wed, Mar 29, 2017 at 7:45 AM, Hazar Güney <[email protected]> >> wrote: >> >>> I see sporadic fetch errors (http first read error: EOF) from backend >>> but backend is normally healthy. It seems that timeout is not the root >>> issue in this case. What could be the reason? >>> >>> * << BeReq >> 98808229 >>> - Begin bereq 98808228 fetch >>> - Timestamp Start: 1490683823.763272 0.000000 0.000000 >>> - BereqMethod GET >>> - BereqURL XXXX >>> - BereqProtocol HTTP/1.1 >>> - BereqHeader Pragma: no-cache >>> - BereqHeader Accept: */* >>> - BereqHeader From: bingbot(at)microsoft.com >>> - BereqHeader Host: XXXX >>> - BereqHeader User-Agent: Mozilla/5.0 (compatible; bingbot/2.0; >>> +http://www.bing.com/bingbot.htm) >>> - BereqHeader Accept-Encoding: gzip >>> - BereqHeader X-Varnish: 98808229 >>> - VCL_call BACKEND_FETCH >>> - VCL_return fetch >>> - BackendOpen 38 reload_2017-03-20T11:32:44.st2 10.35.78.11 80 >>> 172.17.0.2 48388 >>> - BackendStart 10.35.78.11 80 >>> - Timestamp Bereq: 1490683823.763758 0.000487 0.000487 >>> - *FetchError* *http first read error: EOF* >>> - BackendClose 38 reload_2017-03-20T11:32:44.st2 >>> - Timestamp Beresp: 1490683823.764271 0.000999 0.000513 >>> - Timestamp Error: 1490683823.764277 0.001005 0.000005 >>> - BerespProtocol HTTP/1.1 >>> - BerespStatus 503 >>> - BerespReason Service Unavailable >>> - BerespReason Backend fetch failed >>> - BerespHeader Date: Tue, 28 Mar 2017 06:50:23 GMT >>> - BerespHeader Server: Varnish >>> - VCL_call BACKEND_ERROR >>> - BereqHeader X-Varnish-Backend-5xx: 1 >>> - VCL_return retry >>> - Timestamp Retry: 1490683823.764294 0.001022 0.000017 >>> - Link bereq 97940444 retry >>> - End >>> >>> >>> _______________________________________________ >>> varnish-misc mailing list >>> [email protected] >>> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc >>> >> >> >
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