Hi, Is there any way of configuring how long a keep-alive connection to a backend server will be kept open?
When load-testing my Varnish-2.1.3 setup I see intermittent 503-errors. arnishlog tells me that it is caused by a HTTP read error (connection reset): 98 FetchError c http read error: 104 (Full log of the request is shown below.) As far as I can understand, this error happens because the backend-server closed the connection at the same time that Varnish sent the request. I suspect errors like these will disappear with 2.1.4, as I believe this is the same problem reported in issue #749, which have been fixed in 2.1.4 by retrying on a new connection. However, my preferred way of dealing with this would be to configure the keep-alive timeout of backend-connection to be slightly lower than the configured timeout of the backend server, so that Varnish will always be the one which closes the connection (assuming that the backend server does not prematurely close the connection). This way I should be able to avoid restarting the request. Is there an easy way of achieving this with 2.1.3? Entire request: 98 ReqStart c 192.168.1.24 35632 788531137 98 RxRequest c POST 98 RxURL c /my/url 98 RxProtocol c HTTP/1.1 98 RxHeader c Connection: keep-alive 98 RxHeader c Accept-Encoding: gzip,deflate 98 RxHeader c Cache-Control: no-cache 98 RxHeader c User-Agent: Mozilla/5.0 (X11; U; Linux sh4; rv:1.7.12) Gecko/20100326 Kreatel 98 RxHeader c Pragma: no-cache 98 RxHeader c Content-Type: text/plain 98 RxHeader c Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 98 RxHeader c Keep-Alive: 300 98 RxHeader c Content-Length: 228 98 RxHeader c Host: 192.168.3.20 98 VCL_call c recv pass 98 VCL_call c hash hash 98 VCL_call c pass pass 98 Backend c 95 defaultdirector backend1 98 FetchError c http read error: 104 98 VCL_call c error deliver 98 VCL_call c deliver deliver 98 TxProtocol c HTTP/1.1 98 TxStatus c 503 98 TxResponse c Service Unavailable 98 TxHeader c Server: Varnish 98 TxHeader c Retry-After: 0 98 TxHeader c Content-Type: text/html; charset=utf-8 98 TxHeader c Content-Length: 418 98 TxHeader c Date: Mon, 04 Oct 2010 09:55:29 GMT 98 TxHeader c X-Varnish: 788531137 98 TxHeader c Age: 0 98 TxHeader c Via: 1.1 varnish 98 TxHeader c Connection: close 98 Length c 418 98 ReqEnd c 788531137 1286186129.917763948 1286186129.930047989 0.002107859 0.012248993 0.000035048 Regards Kristian Sørensen _______________________________________________ varnish-misc mailing list [email protected] http://lists.varnish-cache.org/mailman/listinfo/varnish-misc
