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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hello<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We’re having a very nasty production issue. We’re
getting intermittent 503 from Varnish in front of a healthy backend.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This seems to happen on cache-miss, but we’re not
seeing requests make it to the backend. Varnish immediately returns the 503.
After the first 503, the page can usually be loaded by requesting it a few more
times. This seems to indicate that there is some condition within Varnish that
prevents it from hitting the backend that clears up quickly.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Has anyone seen this issue before? Is there anything we can
try?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>This is our startup config:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>DAEMON_OPTS="-a :80 \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-T localhost:6082 \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-f /etc/varnish/default.vcl \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-S /etc/varnish/secret \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-s
file,/var/lib/varnish/$INSTANCE/varnish_storage.bin,1G \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-p http_headers=128 \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-p sess_workspace=262144 \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-p connect_timeout=60 \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-p max_restarts=6 \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-p log_hashstring=on \<o:p></o:p></span></font></p>
<p class=MsoNormal style='text-autospace:none'><font size=3 face=Helvetica><span
style='font-size:12.0pt;font-family:Helvetica'>-p cli_timeout=60 \<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Helvetica><span style='font-size:12.0pt;
font-family:Helvetica'>-t 0"<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Helvetica><span style='font-size:12.0pt;
font-family:Helvetica'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Helvetica><span style='font-size:12.0pt;
font-family:Helvetica'>We are on version 2.0.5<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Helvetica><span style='font-size:12.0pt;
font-family:Helvetica'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Helvetica><span style='font-size:12.0pt;
font-family:Helvetica'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Helvetica><span style='font-size:12.0pt;
font-family:Helvetica'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Helvetica><span style='font-size:12.0pt;
font-family:Helvetica'>August</span></font><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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