Hi all,
for a longer time I notice a few backend connection failures
('backend_fail' in varnishstat).
It occurs about 1-2 times per hour (on varnish 2.1.5 serving about 600
req/sec).
I wrote a small perl script (attached) in order to hunt down this error.
My plan was to check the 'backend_fail' parameter by cyclic checks using
'varnishstat' and to dump the shared log memory using 'varnishlog' if
the number increases.
The only interesting message (grepping for 'fail' and 'error') I got is
the following:
456 Debug c "Write error, retval = 39424, len = 140216, errno
= Connection reset by peer"
Does anyone has an idea what the issue could be? Might this be solved by
changing some varnish parameters? If yes, which ones?
Any hint is very appreciated. Thanks a lot in advance.
Stefan
-*-*-*-
Here is my short (q&d) perl script (maybe it also helps others to hunt
other issues)...
#!/usr/bin/perl
my $last_be_fail = &Fetch_Backend_Fail();
my $curr_be_fail;
my $dumps = 10;
while (1) {
print "\n";
sleep 10;
$curr_be_fail = &Fetch_Backend_Fail();
print "cmp[$curr_be_fail][$last_be_fail] ";
if ($curr_be_fail > $last_be_fail) {
if ($dumps > 0) {
&Dump_Varnishlog();
$dumps--;
}
$last_be_fail = $curr_be_fail;
}
}
sub Fetch_Backend_Fail {
my $VARNISHSTAT = "/usr/bin/varnishstat -n port80 -1 | /usr/bin/grep
backend_fail | /usr/bin/awk '{ print \$2 }'";
my $be_fail = `$VARNISHSTAT`;
chomp $be_fail;
my $date = `/bin/date +"%Y-%m-%d %H:%M:%S"`;
chomp $date;
print "$date: backend_fail:[$be_fail] ";
return $be_fail;
}
sub Dump_Varnishlog {
my $date = `/bin/date +"%Y%m%d%H%M%S"`;
chomp $date;
my $VARNISHLOG = "/usr/bin/varnishlog -d -n port80 >
/var/tmp/varnishlog.$date.log";
print "Schreibe Logdatei...\n$VARNISHLOG\n";
`$VARNISHLOG`;
}
1;
--
*Dipl.-Inform. Stefan Pommerening
Informatik-Büro: IT-Dienste & Projekte, Consulting & Coaching*
http://www.dmsp.de <http://www.dmsp.de/>
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