Squid parent Selection Algorithm

 
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Old 06-15-2015
Squid parent Selection Algorithm

Hello guys,
I have one question regarding choosing proper peer Selection Algorithm. Actually we have six Squid (2.7) servers with two parent upstream proxies running on two web appliances. In appliance statistics we see that balancing is not optimal and first appliance is keeping the majority of load.

Currently configuration on all Squids looks like:
Code:
cache_peer parent1 parent 80 0 no-query no-digest no-netdb-exchange userhash sourcehash round-robin
cache_peer parent2 parent 80 0 no-query no-digest no-netdb-exchange userhash sourcehash round-robin

My question is how exactly Squid is acting when there is defined more algorithms of Peer Selection (in this case userhash sourcehash round-robin) and how it will behave in case that there are define only two upstream proxies?
Just note that before all six proxies is network balancer which is masking source IP of client so sourcehash seems to be for me as nonsense since source IP is the same every time. User name is visible for proxies so userhash is feasible solution but not sure how much is optimal in case just two parent proxies.

Many thanks for sharing your opinions.
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squid_radius_auth(8)					      System Manager's Manual					      squid_radius_auth(8)

NAME
squid_radius_auth - Squid RADIUS authentication helper SYNOPSIS
squid_radius_auth -f configfile squid_radius_auth -h "server" [-p port] [-i identifier] -w secret DESCRIPTION
This helper allows Squid to connect to a RADIUS server to validate the user name and password of Basic HTTP authentication. -f configfile Specifies the path to a configuration file. See the CONFIGURATION section for details. -h server Alternative method of specifying the server to connect to -p port Specify another server port where the RADIUS server listens for requests if different from the default RADIUS port. Normally not specified. -i identifier Unique identifier identifying this Squid proxy to the RADIUS server. If not specified the IP address is used as to identify the proxy. -w secret Alternative method of specifying the shared secret. Using the configuration file is generally more secure and recommended. -t timeout RADIUS request timeout. Default 10 seconds. CONFIGURATION
The configuration specifies how the helper connects to RADIUS. The file contains a list of directives (one per line). Lines beginning with a # is ignored. server radiusserver specifies the name or address of the RADIUS server to connect to. secret somesecretstring specifies the shared RADIUS secret. identifier nameofserver specifies what the proxy should identify itsels as to the RADIUS server. This directive is optional. port portnumber Specifies the port number or service name where the helper should connect. AUTHOR
This manual page was written by Henrik Nordstrom <hno@squid-cache.org> squid_radius_auth is written by Marc van Selm <selm@cistron.nl> with contributions from Henrik Nordstrom <hno@squid-cache.org> and many others QUESTIONS
Any questions on usage can be sent to Squid Users <squid-users@squid-cache.org>, or to your favorite RADIUS list/friend if the question is more related to RADIUS than Squid. REPORTING BUGS
Report bugs or bug-fixes to Squid Bugs <squid-bugs@squid-cache.org> or ideas for new improvements to Squid Developers <squid-dev@squid- cache.org> SEE ALSO
RFC2058 - Remote Authentication Dial In User Service (RADIUS) Squid RADIUS Auth 7 August 2004 squid_radius_auth(8)