Re: [squid-users] Large setup, squid load-balancing problem.

Henrik Nordstrom wrote:
>
>
> On Mon, 21 Mar 2005, Juhani Tali wrote:
>
>>
>> The DNS round robin should work (and I am using it at the moment,
>> somewhat).
>>
>> The more interesting is what will happen if one server goes down.
>> Will the child squid take the next address from dns or fail?
>
>
> Squid will mark the failed address as down and stop using it until the
> DNS entry is refreshed (by TTL, client initiated forced reload or PURGE).
>
> Regards
> Henrik

I tested the behaviour a bit more:
squid.conf
only one cache_peer line:
cache_peer cache_test.aso.ee parent 3128 7 no-query round-robin

and tcpdump:
09:50:37.971722 IP kontor.aso.ee.37646 > cache1.aso.ee.3128: . ack 265
09:50:38.008114 IP kontor.aso.ee.37646 > cache1.aso.ee.3128: . ack 1539
09:50:38.072213 IP kontor.aso.ee.37855 > 195.80.96.217.3128: S
09:50:38.072383 IP kontor.aso.ee.37855 > 195.80.96.217.3128: . ack
09:50:38.072755 IP kontor.aso.ee.37855 > 195.80.96.217.3128: P
09:50:38.202032 IP kontor.aso.ee.37646 > cache1.aso.ee.3128: . ack 2959
09:50:38.207653 IP kontor.aso.ee.37646 > cache1.aso.ee.3128: . ack 3149

Now without the round-robin:
cache_peer cache_proov.asosise parent 3128 7 no-query default

09:59:33.029014 IP kontor.aso.ee.37870 > cache1.aso.ee.3128: . ack
09:59:33.029078 IP kontor.aso.ee.37869 > 195.80.96.217.3128: P
09:59:33.029166 IP kontor.aso.ee.37870 > cache1.aso.ee.3128: P
09:59:33.204759 IP kontor.aso.ee.37870 > cache1.aso.ee.3128: . ack 351
09:59:44.679716 IP kontor.aso.ee.37869 > 195.80.96.217.3128: . ack 265
09:59:44.695619 IP kontor.aso.ee.37869 > 195.80.96.217.3128: . ack 1539
09:59:44.896929 IP kontor.aso.ee.37869 > 195.80.96.217.3128: . ack 2959
09:59:44.899308 IP kontor.aso.ee.37869 > 195.80.96.217.3128: . ack 3149
09:59:44.918317 IP kontor.aso.ee.37869 > 195.80.96.217.3128: . ack 4569
09:59:44.919612 IP kontor.aso.ee.37870 > cache1.aso.ee.3128: P
09:59:44.933504 IP kontor.aso.ee.37869 > 195.80.96.217.3128: . ack 5855
Received on Tue Mar 22 2005 - 01:46:21 MST