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

[Guillaume Quintard]

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 <hazarguney at gmail.com> wrote:

> 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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