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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Confirmed. Changing director load balance logic, backend
membership, and backend health checks requires a restart. Makes for exciting
times if you need to change .probe parameters on the fly when varnish thinks
all your backends are sick.<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>
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Stefan Caunter :: Senior Systems Administrator :: TOPS<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>e: scaunter@topscms.com :: m: (416) 561-4871<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>www.thestar.com www.topscms.com<o:p></o:p></span></p>
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<p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:
"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> varnish-misc-bounces@varnish-cache.org
[mailto:varnish-misc-bounces@varnish-cache.org] <b>On Behalf Of </b>Ken
Brownfield<br>
<b>Sent:</b> July-28-10 9:48 AM<br>
<b>To:</b> John Norman<br>
<b>Cc:</b> Varnish misc<br>
<b>Subject:</b> Re: health check path doesn't change after VCL reload (2.0.6)<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I also recently confirmed that the backend specs aren't
reset with a VCL reload. We had a backend timeout that was too short, but
we had to do a hard restart of all instances to pick up the change. Not
the end of the world; worst case this might belong on the wiki.<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>The code to modify or respawn backend threads might be
somewhat complicated, but it's probably worth it, IMHO.<o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:13.5pt;font-family:"Minion Pro","serif";
color:black'>-- <o:p></o:p></span></p>
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<p class=MsoNormal><span style='font-size:13.5pt;font-family:"Minion Pro","serif";
color:black'>Ken<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>On Feb 24, 2010, at 1:25 PM, John Norman wrote:<o:p></o:p></p>
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<p class=MsoNormal><br>
<br>
<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>No, only the former / old path.<br>
<br>
I'm not super-troubled right now because a Varnish restart did pick up the new
path (but at the cost of my cache) -- but I'm a bit worried about the next time
I have to change it.<br>
<br>
I will be changing the probe interval soon, so that will give me a chance to
reproduce the problem, if it even exists.<br>
<br>
As a bit of background:<br>
<br>
I automate the VCL update to multiple servers, when/if the VCL file has
changed.<br>
<br>
Before the update, I also remove all of the inactive/old VCL's that are sitting
there.<br>
<br>
Then I add the new one and "use" it.<br>
<br>
When I observed in my backend logs the probes going to the old URLs, I did
check the "active" VCL on all systems, and they all showed the new
path.<br>
<br>
In any case, I will try to reproduce and will send the results.<br>
<br>
One last thing: During the restart on one system, I observed the issue reported
here: <a
href="http://zarathustrashallspeak.com/2009/11/28/varnish-startup-issue/">http://zarathustrashallspeak.com/2009/11/28/varnish-startup-issue/</a><br>
<br>
John<o:p></o:p></p>
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<p class=MsoNormal>On Wed, Feb 24, 2010 at 4:18 PM, Poul-Henning Kamp <<a
href="mailto:phk@phk.freebsd.dk">phk@phk.freebsd.dk</a>> wrote:<o:p></o:p></p>
<p class=MsoNormal>In message <<a
href="mailto:b6b8b6b71002241315w1c62022t1bf941d6f2cac0c7@mail.gmail.com">b6b8b6b71002241315w1c62022t1bf941d6f2cac0c7@mail.gmail.com</a>>,
John N<o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'>orman writes:<br>
<br>
>Still, the VCL indicated as "active" had a different path for the
health<br>
>check.<o:p></o:p></p>
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<p class=MsoNormal>Hopefully both got probed ?<br>
<span style='color:#888888'><br>
--</span><o:p></o:p></p>
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<p class=MsoNormal>Poul-Henning Kamp | UNIX since Zilog
Zeus 3.20<br>
<a href="mailto:phk@FreeBSD.ORG">phk@FreeBSD.ORG</a>
| TCP/IP since RFC 956<br>
FreeBSD committer | BSD since 4.3-tahoe<br>
Never attribute to malice what can adequately be explained by incompetence.<o:p></o:p></p>
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