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Re: sourcehash load balance

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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

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