On 11/21/2016 10:34 AM, Ayberk Kimsesiz wrote:
> 
> Varnishlog:  *FetchError     http first read error: EOF*

That's a first byte timeout.

> *-   FetchError     http first read error: EOF* -   BackendClose
> 160 boot.default -   Timestamp      Beresp: 1479720457.535409
> 60.000158 60.000088 -   Timestamp      Error: 1479720457.535417
> 60.000165 0.000008

The Timestamp is telling you (2nd and 3rd numbers after
Timestamp:Beresp) that your backend "boot.default" didn't send a
response for 60 seconds before Varnish gave up, presumably because
first_byte_timeout=60s.

man vsl(7) tells you how to interpret the Timestamp log entries:

https://www.varnish-cache.org/docs/trunk/reference/vsl.html#timestamps

https://www.varnish-cache.org/docs/trunk/reference/vsl.html#backend-fetch-timestamps

So you need to fix your backend.


HTH,
Geoff
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