I have no idea why backend is sick

[Abraham Cruz Sustaita]

I have all the sections in separated files:

At backend.vcl

backend app02 {
  .host = "app02.domain.com";
  .port = "80";
  .connect_timeout = 1.5s;
  .first_byte_timeout = 45s;
  .between_bytes_timeout = 30s;
  .probe = {
    .url = "/health-check.html";
    .interval = 1s;
    .timeout = 30s;
    .window = 10;
    .threshold = 8;
  }
}

At vcl_recv.vcl:

  #request to beta
  if (req.http.Host == "www.domain.com") {
    set req.backend = app02;
  }



2012/7/18 Shibashish <shib4u at gmail.com>

> On Wed, Jul 18, 2012 at 4:55 PM, Abraham Cruz Sustaita <
> abraham.sustaita at buscacorp.com> wrote:
>
>> I have 8 servers, 7 of them are working as they supposed to be working.
>> However, I have app02, and it is not working. The first problem I noticed
>> was it was reporting errors even when I change the error reporting to off.
>> The second problem, and the one that is give me troubles, is that after I
>> reboot the server, it is not working. I have this in the log:
>>
>> varnishlog | grep app02
>>     0 Backend_health - app02 Still healthy 4--X-R- 3 3 5 0.000488
>> 0.000000 HTTP/1.1 301 Moved Permanently
>>     5 BackendOpen  b app02 192.168.11.42 48452 192.168.11.32 80
>>     5 BackendReuse b app02
>>     4 Backend      c 5 old app02
>>     4 ObjHeader    c b_n: app02
>>     4 TxHeader     c b_n: app02
>>    37 BackendOpen  b app02 192.168.11.42 48460 192.168.11.32 80
>>    37 BackendReuse b app02
>>     5 BackendReuse b app02
>>    20 Backend      c 5 old app02
>>    20 ObjHeader    c b_n: app02
>>    20 TxHeader     c b_n: app02
>>    28 Backend      c 37 old app02
>>    28 ObjHeader    c b_n: app02
>>    28 TxHeader     c b_n: app02
>>     0 Backend_health - app02 Went sick 4--X-R- 2 3 5 0.000722 0.000000
>> HTTP/1.1 301 Moved Permanently
>>     5 BackendReuse b app02
>>    68 Backend      c 5 old app02
>>    68 ObjHeader    c b_n: app02
>>    68 TxHeader     c b_n: app02
>>    37 BackendReuse b app02
>>    75 Backend      c 37 old app02
>>    75 ObjHeader    c b_n: app02
>>    75 TxHeader     c b_n: app02
>>   123 TxHeader     c b_n: app02
>>   259 TxHeader     c b_n: app02
>>   187 TxHeader     c b_n: app02
>>     0 Backend_health - app02 Still sick 4--X-R- 1 3 5 0.000520 0.000000
>> HTTP/1.1 301 Moved Permanently
>>    67 TxHeader     c b_n: app02
>>     0 Backend_health - app02 Still sick 4--X-R- 0 3 5 0.000503 0.000000
>> HTTP/1.1 301 Moved Permanently
>>
>> But the problem is that the server is working ok. If I do wget app02 from
>> varnish, it returns what it is supposed to return! But varnish says that it
>> went sick... Is there anyway I can trace this?
>>
>> I have modified my hosts file in order to point www.domain.com to app02
>> so I can do wget www.domain.com (www.domain.com is the domain I have in
>> that server), and it response as it supposed:
>>
>> wget --server-response --spider www.domain.com
>> Spider mode enabled. Check if remote file exists.
>> --2012-07-18 23:53:20--  http://www.domain.com/
>> Resolving www.domain.com... 192.168.11.32
>> Connecting to www.domain.com|192.168.11.32|:80... connected.
>> HTTP request sent, awaiting response...
>>   HTTP/1.1 200 OK
>>   Date: Wed, 18 Jul 2012 23:53:20 GMT
>>   Server: Apache/2.2.22 (Fedora)
>>   X-Powered-By: PHP/5.4.4
>>   Set-Cookie: sessionToken=a73cdcde6439423231f19f7ce6870ae7; expires=Thu,
>> 18-Jul-2013 23:53:21 GMT; path=/; domain=.domain.com
>>   Set-Cookie: sessionToken=46560b800baa0ee9cf0f7eeea8dc1add; expires=Thu,
>> 18-Jul-2013 23:53:21 GMT; path=/; domain=.domain.com
>>   Set-Cookie: sessionToken=8bfa42f1782db58726ebdc500ede7705; expires=Thu,
>> 18-Jul-2013 23:53:21 GMT; path=/; domain=.domain.com
>>   Vary: Accept-Encoding
>>   Cache-Control: no-store, no-cache, must-revalidate, max-age=0
>>   Pragma: no-cache
>>   Keep-Alive: timeout=15, max=100
>>   Connection: Keep-Alive
>>   Content-Type: text/html; charset=iso-8859-1
>> Length: unspecified [text/html]
>> Remote file exists and could contain further links,
>> but recursion is disabled -- not retrieving.
>>
>>
>>
>> _______________________________________________
>> varnish-misc mailing list
>> varnish-misc at varnish-cache.org
>> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc
>>
>
>
> Show us the relevant vcl config.
>
> Also, u can see Varnish is getting 301 but wget getting 200, so check the
> config and backend again.
>
> --
> ShiB.
> while ( ! ( succeed = try() ) );
>
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