[squid-users] sourcehash load balance

[André Janna]

On 23/10/2016 10:35 a.m., Amos Jeffries wrote:

> On 22/10/2016 12:21 a.m., André Janna wrote:
>> I set up a Squid proxy that forwards all requests to 2 parent caches.
>> I'm using Squid version 3.5.19.
>> My goal is that multiple connection from a client to a server should be
>> forwarded to the same parent, so that the server see all requests coming
>> from the same IP address.
>>
>> I'm using the following configuration:
>> cache_peer squid1 parent 3128 0 no-query sourcehash
>> cache_peer squid2 parent 3128 0 no-query sourcehash
>> never_direct allow all
>>
>> Looking at access.log some requests are tagged as CLOSEST_PARENT instead
>> of SOURCEHASH_PARENT, so it seams that Squid is not always using source
>> hash rule to forward requests to parent caches.
>> For instance:
>> 1477046954.047   3882 10.11.2.4 TCP_TUNNEL/200 21935 CONNECT
>> sso.cisco.com:443 - SOURCEHASH_PARENT/10.0.33.12 -
>> 1477046968.056     21 10.11.2.4 TCP_MISS/200 1012 POST
>> http://ocsp.digicert.com/ - CLOSEST_PARENT/10.0.33.13
>> application/ocsp-response
>> 1477047782.038     22 10.11.2.4 TCP_MISS/204 307 GET
>> http://clients1.google.com/generate_204 - SOURCEHASH_PARENT/10.0.33.12 -
>> 1477047782.045    181 10.11.2.4 TCP_MISS/200 745 GET
>> http://tags.bluekai.com/site/2964? - CLOSEST_PARENT/10.0.33.13 image/gif
>>
>> So requests from the same client are not sent to the same parent cache.
>> How can I force Squid to always use source hash parent selection method?
> Check you setting for nonhierarchical_direct. It should be 'off'. The
> default is 'on'.
>
> Amos
>
>

Hi Amos,
I've just added "nonhierarchical_direct off" to my setting but there are 
still requests that are forwarded using a parent selection method 
different from "sourcehash".
For instance:
1477331305.998     13 10.11.0.12 TCP_MISS/200 4267 GET 
http://www.cisco.com/etc/designs/cdc/dmr/icons/arrows-grey.png - 
SOURCEHASH_PARENT/10.0.33.12 image/png
1477331306.948     10 10.11.0.12 TCP_MISS/304 609 GET 
http://platform.twitter.com/widgets.js - CLOSEST_PARENT/10.0.33.13 -

Regards,
Andre