intermittent 503's

[L Cruzero]

Hi,  in our varnish setup(varnish-3.0.3-1.el5) using a loadbalanced really
Healthy VIP as the only backend, we seem to be getting intermittent 503's


stdout captured with varnishlog -c -m TxStatus:503

   35 ReqStart     c 10.33.13.254 24582 1166630723
   35 RxRequest    c POST
   35 RxURL        c
/index.php?option=com_jce&task=plugin&plugin=imgmanager&file=imgmanager&method=form&cid=20&6bc427c8a7981f4fe1f5ac65c1246b5f=cf6dd3cf1923c950586d0dd595c8e20b
   35 RxProtocol   c HTTP/1.1
   35 RxHeader     c User-Agent: BOT/0.1 (BOT for JCE)
   35 RxHeader     c Content-Type: multipart/form-data;
boundary=---------------------------41184676334
   35 RxHeader     c Content-Length: 5000
   35 RxHeader     c True-Client-IP: 202.80.119.178
   35 RxHeader     c X-Akamai-CONFIG-LOG-DETAIL: true
   35 RxHeader     c TE:  chunked;q=1.0
   35 RxHeader     c Connection: TE
   35 RxHeader     c Akamai-Origin-Hop: 2
   35 RxHeader     c Via: 1.1 v1-akamaitech.net(ghost) (AkamaiGHost), 1.1
akamai.net(ghost) (AkamaiGHost)
   35 RxHeader     c X-Forwarded-For: 202.80.119.178, 114.4.39.206
   35 RxHeader     c Host: www.somedomain.com <http://www.oregonlive.com>
   35 RxHeader     c Cache-Control: max-age=120
   35 RxHeader     c Connection: keep-alive
   35 RxHeader     c X-Forwarded-For: 23.73.180.223
   35 RxHeader     c Accept-Encoding: identity
   35 VCL_call     c recv pass
   35 VCL_call     c hash
   35 Hash         c
/index.php?option=com_jce&task=plugin&plugin=imgmanager&file=imgmanager&method=form&cid=20&6bc427c8a7981f4fe1f5ac65c1246b5f=cf6dd3cf1923c950586d0dd595c8e20b
   35 Hash         c www.somedomain.com <http://www.oregonlive.com>
   35 VCL_return   c hash
   35 VCL_call     c pass pass
   35 Backend      c 29 www_prod www_prod
   35 FetchError   c backend write error: 104 (Connection reset by peer)
   35 Backend      c 42 www_prod www_prod
   35 FetchError   c backend write error: 104 (Connection reset by peer)
   35 VCL_call     c error deliver
   35 VCL_call     c deliver deliver
   35 TxProtocol   c HTTP/1.1
   35 TxStatus     c 503
   35 TxResponse   c Service Unavailable
   35 TxHeader     c Server: Varnish
   35 TxHeader     c Content-Type: text/html; charset=utf-8
   35 TxHeader     c Retry-After: 5
   35 TxHeader     c Content-Length: 419
   35 TxHeader     c Accept-Ranges: bytes
   35 TxHeader     c Date: Tue, 15 Apr 2014 19:31:22 GMT
   35 TxHeader     c X-Varnish: 1166630723
   35 TxHeader     c Age: 0
   35 TxHeader     c Via: 1.1 varnish
   35 TxHeader     c Connection: close
   35 Length       c 419
   35 ReqEnd       c 1166630723 1397590282.467632055 1397590282.899372101
0.033779144 0.431685925 0.0000541


here is super simple pass thru NO cache config :


backend www_prod {
  .host = "cs-****.*****.*****.net";
  .port = "80";
  .probe = {
        .url = "/";
        .timeout = 5s;
        .interval = 1s;
        .window = 5;
        .threshold = 2;
  }
}

 sub vcl_recv {
      if (req.http.X-ADI-MISS) {
        # Force a cache miss
                 set req.hash_always_miss = true;
        }

        if (req.url == "/varnish-health/" || req.url ~ "^/stack-check*") {
                error 200 "Varnish is responding";
                set req.http.Connection = "close";
  }


    if (req.http.host ~ "^(origin|www)") {
        set req.http.host = regsub(req.http.host, "^origin\.", "www.");
        set req.backend = www_prod;
        return(pass);

}


## we tried with and w/o these conditions intermittent 503's persisted

#       if (req.backend.healthy) {
#       set req.grace = 30s;
#   } else {
#       set req.grace = 24h;
#   }

 }


sub vcl_fetch {
#            set beresp.do_esi = true;
            set beresp.ttl = 1m;

#           set beresp.grace = 24h;
}


Any helpful thoughts and or possible leads on this will be much appreciated.

kind regards,

-LC
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