What are the steps to problem solve when all I can get are 503s?
Jorge Díaz
jdzstz at gmail.com
Sat Jul 10 09:47:42 CEST 2010
It seems for some reason Varnish cannot connect to backend.
I have never used parameter " -b 87.238.47.204:80 <http://87.238.47.204/> "
for backend configuration.
You sould try creating a little VCL configuration file.
Modify default.vcl adding the backend in it, and start varnish with
parameter -f
-f /opt/extra/etc/varnish/default.vcl
Inside VCL, configure the backed with:
backend default {
.host = "87.238.47.204";
.port = "80";
}
If the problem persist, a good idea is to install a Apache webserver
in localhost and try It as backend, for example in 127.0.0.1 port 8000
in order to see if the problem is varnish connecting to a remote IP or
is varnish that not connect to nobody.
My varnish installation is in same host of Apache webserver and works OK.
Regards.
2010/7/9 Jacques <whshub at gmail.com>
> I'm not currently using a vcl, just configuring via the command line for
> simplicity. Adding the connect_timeout parameter below had no impact on the
> 503s. Nor did adding all the parameters listed at letsdugg.com.
>
> Communication with the external server works perfectly. (Telnet and via
> lynx.) It's actually the varnish-cache.org site just to introduce a
> minimum number of variables.
>
> The only thing that I see in the varnish log is the FetchError, no backend
> connection.
>
> Here is a startup, request, shutdown cycle of varnish log:
>
> # /opt/extra/bin/varnishlog
> 0 WorkThread - fffffd7ff9dc0d20 start
> 0 CLI - Rd vcl.load "boot" ./vcl.ORk8t3RP.so
> 0 CLI - Wr 200 Loaded "./vcl.ORk8t3RP.so" as "boot"
> 0 CLI - Rd vcl.use "boot"
> 0 CLI - Wr 200
> 0 CLI - Rd start
> 0 Debug - "Acceptor poll space increased to 512"
> 0 Debug - "Acceptor is poll"
> 0 CLI - Wr 200
> 0 WorkThread - fffffd7ff93c5d20 start
> 0 WorkThread - fffffd7ff91c6d20 start
> 0 WorkThread - fffffd7ff8fc7d20 start
> 0 WorkThread - fffffd7ff8dc8d20 start
> 0 WorkThread - fffffd7ff8bc9d20 start
> 0 WorkThread - fffffd7ff89cad20 start
> 0 WorkThread - fffffd7ff87cbd20 start
> 0 WorkThread - fffffd7ff85ccd20 start
> 0 WorkThread - fffffd7ff83cdd20 start
> 0 CLI - Rd ping
> 0 CLI - Wr 200 PONG 1278687217 1.0
> 0 CLI - Rd ping
> 0 CLI - Wr 200 PONG 1278687220 1.0
> 9 SessionOpen c 10.100.200.1 64024 :80
> 9 ReqStart c 10.100.200.1 64024 1455837036
> 9 RxRequest c GET
> 9 RxURL c /
> 9 RxProtocol c HTTP/1.0
> 9 RxHeader c Host: 10.100.200.2
> 9 RxHeader c Accept: text/html, text/plain, text/css, text/sgml,
> */*;q=0.01
> 9 RxHeader c Accept-Encoding: gzip, compress, bzip2
> 9 RxHeader c Accept-Language: en
> 9 RxHeader c User-Agent: Lynx/2.8.6rel.5 libwww-FM/2.14
> SSL-MM/1.4.1 OpenSSL/0.9.8l
> 9 VCL_call c recv
> 9 VCL_return c lookup
> 9 VCL_call c hash
> 9 VCL_return c hash
> 9 VCL_call c miss
> 9 VCL_return c fetch
> 9 FetchError c no backend connection
> 9 VCL_call c error
> 9 VCL_return c deliver
> 9 Length c 488
> 9 VCL_call c deliver
> 9 VCL_return c deliver
> 9 TxProtocol c HTTP/1.1
> 9 TxStatus c 503
> 9 TxResponse c Service Unavailable
> 9 TxHeader c Server: Varnish
> 9 TxHeader c Retry-After: 0
> 9 TxHeader c Content-Type: text/html; charset=utf-8
> 9 TxHeader c Content-Length: 488
> 9 TxHeader c Date: Fri, 09 Jul 2010 14:53:42 GMT
> 9 TxHeader c X-Varnish: 1455837036
> 9 TxHeader c Age: 0
> 9 TxHeader c Via: 1.1 varnish
> 9 TxHeader c Connection: close
> 9 ReqEnd c 1455837036 1278687222.201183081 1278687222.201552391
> 0.000498056 0.000254393 0.000114918
> 9 SessionClose c error
> 9 StatSess c 10.100.200.1 64024 0 1 1 0 0 0 235 488
> 0 CLI - Rd ping
> 0 CLI - Wr 200 PONG 1278687223 1.0
> 0 CLI - Rd ping
> 0 CLI - Wr 200 PONG 1278687226 1.0
> 0 CLI - Rd ping
> 0 CLI - Wr 200 PONG 1278687229 1.0
>
>
>
>
>
>
> On Fri, Jul 9, 2010 at 12:58 AM, Jorge Díaz <jdzstz at gmail.com> wrote:
>
>> ¿There is communication between Varnish host and 87.238.47.204 machine??
>>
>> Try first making " telnet 87.238.47.204 80 " in order testing there is no
>> firewall or a rule configured in webserver.
>>
>> If comunication is fine, the problem must be in VCL configuration. Try
>> executing varnishlog while you are testing and look for errors in output.
>>
>> In Solaris is also important to run Varnish with proper parameter that are
>> listen in:
>>
>> - http://letsgetdugg.com/2009/12/04/varnish-on-solaris/
>>
>>
>> I had a lot of comunication problems without parameter:
>>
>> * -p connect_timeout=0s # Important bug work around for Solaris*
>>
>>
>>
>>
>>
>> 2010/7/9 Bedis 9 <bedis9 at gmail.com>
>>
>> Hey,
>>>
>>> Can you share your VCL conf?
>>>
>>> cheers
>>>
>>> On Fri, Jul 9, 2010 at 7:08 AM, Jacques <whshub at gmail.com> wrote:
>>>
>>>> I am trying to use Varnish on OpenSolaris. Due the help of others, I
>>>> have versions compiling and not crashing that are based on three different
>>>> versions of Varnish.
>>>>
>>>> I'm using 4516, 2.1.2 with the 649 patch, and trunk. I've also tried
>>>> compiling with gcc 4.3.3 in addition to the OpenSolaris standard of 3.4.3.
>>>> That changed nothing.
>>>>
>>>> All compiled copies of varnish seem to start just fine. I can use
>>>> varnishlog and see my requests arriving at Varnish.
>>>>
>>>> However, responses are always 503 with " FetchError: no backend
>>>> connection". Using tcpdump, I see no calls to the backend server from
>>>> Varnish, ever.
>>>>
>>>> For simplicity, I'm using the basic start of:
>>>>
>>>> varnishd -a :80 -b 87.238.47.204:80
>>>>
>>>> What are right steps to determine what is wrong? I see nothing in
>>>> syslogs. Varnish doesn't complain. Using all the same steps on ubuntu, I
>>>> get exactly what I expect, a cached version of the backend server.
>>>>
>>>> Any pointers about how I should figure out what is failing would be
>>>> helpful.
>>>>
>>>> Thanks,
>>>> Jacques
>>>>
>>>> I've also noticed that the cache is starting at 500GB. Changing the
>>>> cache size to 512MB didn't have any impact on the 503s.
>>>>
>>>> _______________________________________________
>>>> varnish-misc mailing list
>>>> varnish-misc at varnish-cache.org
>>>> http://lists.varnish-cache.org/mailman/listinfo/varnish-misc
>>>>
>>>
>>>
>>> _______________________________________________
>>> varnish-misc mailing list
>>> varnish-misc at varnish-cache.org
>>> http://lists.varnish-cache.org/mailman/listinfo/varnish-misc
>>>
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://www.varnish-cache.org/lists/pipermail/varnish-misc/attachments/20100710/fe94310f/attachment-0003.html>
More information about the varnish-misc
mailing list