Hi all,
I'm working with a set of varnish-caches (2.1.3) in front of some
round-robin director configured backends.
Sometimes I experience a 503 error due to some unforseeable
circumstances like network hiccups, content server problems and other
magic... ;-)
Nevertheless all backends are healthy regarding the large majority of
other requests (and watchdog of course), we deal with sporadic failures
here.
Obviously I don't want those 503's to go through to the user.
I inserted the following code in my vcl_fetch:
if (beresp.status == 503) {
set beresp.saintmode = 2s;
restart;
}
This works quite well, the failed (503 delivering) request is forwarded
to the next backend in the director and is successfully served then.
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?
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.
My current syslog()-msg is:
syslog (LOG_LOCAL7 | LOG_INFO, "VarnishLog(vcl_fetch): %s/%s[%s]
[REST=%02d] %s http://%s%s";,
VRT_backend_string(sp), VRT_r_server_hostname(sp),
VRT_IP_string(sp,VRT_r_server_ip(sp)),
VRT_r_req_restarts(sp), VRT_r_req_request(sp), VRT_GetHdr(sp,
HDR_REQ, "\005host:"), VRT_r_req_url(sp));
I managed to get the backend definition, but not the specific backend
machine name (or IP) from the backend director.
... and: is there some sort of overview on which VRT_magic fields (for
use with inline-C) exists?
Thanks in advance,
Stefan
--
*Dipl.-Inform. Stefan Pommerening
Informatik-Büro: IT-Dienste & Projekte, Consulting & Coaching*
http://www.dmsp.de
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