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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>(sorry for top-posting)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I believe varnishlog has all you need:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> 54 BackendOpen b backend_name source_ip source_port dest_ip dest_port<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Just track the id on the left (54 in this case) for the request and response and you should be able to find the culprit. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext'> varnish-misc-bounces@varnish-cache.org [mailto:varnish-misc-bounces@varnish-cache.org] <b>On Behalf Of </b>Stefan Pommerening<br><b>Sent:</b> Wednesday, 9 February 2011 9:47 PM<br><b>To:</b> varnish-misc@varnish-cache.org<br><b>Subject:</b> How to find out a single failing backend from a round-robin director?(Inline-C)<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Hi all,<br><br>I'm working with a set of varnish-caches (2.1.3) in front of some round-robin director configured backends.<br>Sometimes I experience a 503 error due to some unforseeable circumstances like network hiccups, content server problems and other magic... ;-)<br>Nevertheless all backends are healthy regarding the large majority of other requests (and watchdog of course), we deal with sporadic failures here.<br><br>Obviously I don't want those 503's to go through to the user.<br><br>I inserted the following code in my vcl_fetch:<br><br>if (beresp.status == 503) {<br> set beresp.saintmode = 2s;<br> restart;<br>}<br><br>This works quite well, the failed (503 delivering) request is forwarded to the next backend in the director and is successfully served then.<br><br>What I am missing is the exact backend information which backend did not serve the request or better said: where did the 503 come from?<br>I already included some inline-C in order to send info to syslog, but I am missing some VRT_(r_)something to find out the failing backend without searching the backend's logfiles directly.<br><br>My current syslog()-msg is:<br><br>syslog (LOG_LOCAL7 | LOG_INFO, "VarnishLog(vcl_fetch): %s/%s[%s] [REST=%02d] %s <a href="http://%25s%25s">http://%s%s</a>", <br> VRT_backend_string(sp), VRT_r_server_hostname(sp), VRT_IP_string(sp,VRT_r_server_ip(sp)), <br> VRT_r_req_restarts(sp), VRT_r_req_request(sp), VRT_GetHdr(sp, HDR_REQ, "\005host:"), VRT_r_req_url(sp));<br><br>I managed to get the backend definition, but not the specific backend machine name (or IP) from the backend director.<br><br>... and: is there some sort of overview on which VRT_magic fields (for use with inline-C) exists?<br><br>Thanks in advance,<br>Stefan<o:p></o:p></p><div><p class=MsoNormal>-- <o:p></o:p></p><p class=font8b><b>Dipl.-Inform. Stefan Pommerening<br>Informatik-Büro: IT-Dienste & Projekte, Consulting & Coaching</b><br><a href="http://www.dmsp.de">http://www.dmsp.de</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></div><BR>
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