Re: Random “http first read error: EOF” errors

[Hazar Güney]

Backend is Apache.

On Wed, Mar 29, 2017 at 10:34 AM, Guillaume Quintard <
guillaume at varnish-software.com> 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 <hazarguney at gmail.com> 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
>>
>>
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>
>
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