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Full Discussion: Squid parent Selection Algorithm
Special Forums IP Networking Proxy Server Squid parent Selection Algorithm Post 302947093 by brusell on Monday 15th of June 2015 11:12:11 AM
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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LEARN ABOUT DEBIAN

gsi_driver_types

Types(3)						       globus xio gsi driver							  Types(3)

NAME

       Types -

   Typedefs
       typedef void(* globus_xio_gsi_delegation_init_callback_t )(globus_result_t result, void *user_arg)
       typedef void(* globus_xio_gsi_delegation_accept_callback_t )(globus_result_t result, gss_cred_id_t delegated_cred, OM_uint32 time_rec, void
	   *user_arg)

   Enumerations
       enum globus_xio_gsi_protection_level_t { GLOBUS_XIO_GSI_PROTECTION_LEVEL_NONE, GLOBUS_XIO_GSI_PROTECTION_LEVEL_INTEGRITY,
	   GLOBUS_XIO_GSI_PROTECTION_LEVEL_PRIVACY }
       enum globus_xio_gsi_delegation_mode_t { GLOBUS_XIO_GSI_DELEGATION_MODE_NONE, GLOBUS_XIO_GSI_DELEGATION_MODE_LIMITED,
	   GLOBUS_XIO_GSI_DELEGATION_MODE_FULL }
       enum globus_xio_gsi_proxy_mode_t { GLOBUS_XIO_GSI_PROXY_MODE_FULL, GLOBUS_XIO_GSI_PROXY_MODE_LIMITED, GLOBUS_XIO_GSI_PROXY_MODE_MANY }
       enum globus_xio_gsi_authorization_mode_t { GLOBUS_XIO_GSI_NO_AUTHORIZATION, GLOBUS_XIO_GSI_SELF_AUTHORIZATION,
	   GLOBUS_XIO_GSI_IDENTITY_AUTHORIZATION, GLOBUS_XIO_GSI_HOST_AUTHORIZATION }

Typedef Documentation
   typedef void(*  globus_xio_gsi_delegation_init_callback_t)(globus_result_t result, void *user_arg)
       Globus XIO GSI init delegation callback.

   typedef void(*  globus_xio_gsi_delegation_accept_callback_t)(globus_result_t result, gss_cred_id_t delegated_cred, OM_uint32 time_rec, void
       *user_arg)
       Globus XIO GSI init delegation callback.

Enumeration Type Documentation
   enum globus_xio_gsi_protection_level_t
       Globus XIO GSI protection levels.

       Enumerator:

       GLOBUS_XIO_GSI_PROTECTION_LEVEL_NONE
	      No security.

       GLOBUS_XIO_GSI_PROTECTION_LEVEL_INTEGRITY
	      Messages are signed.

       GLOBUS_XIO_GSI_PROTECTION_LEVEL_PRIVACY
	      Messages are signed and encrypted.

   enum globus_xio_gsi_delegation_mode_t
       Globus XIO GSI delegation modes.

       Enumerator:

       GLOBUS_XIO_GSI_DELEGATION_MODE_NONE
	      No delegation.

       GLOBUS_XIO_GSI_DELEGATION_MODE_LIMITED
	      Delegate a limited proxy.

       GLOBUS_XIO_GSI_DELEGATION_MODE_FULL
	      Delegate a full proxy.

   enum globus_xio_gsi_proxy_mode_t
       Globus XIO GSI proxy modes.

       Enumerator:

       GLOBUS_XIO_GSI_PROXY_MODE_FULL
	      Accept only full proxies.

       GLOBUS_XIO_GSI_PROXY_MODE_LIMITED
	      Accept full proxies and limited proxies if they are the only limited proxy in the cert chain.

       GLOBUS_XIO_GSI_PROXY_MODE_MANY
	      Accept both full and limited proxies unconditionally.

   enum globus_xio_gsi_authorization_mode_t
       Globus XIO GSI authorization modes.

       Enumerator:

       GLOBUS_XIO_GSI_NO_AUTHORIZATION
	      Do not perform any authorization. This will cause a error when used in conjunction with delegation on the init/client side.

       GLOBUS_XIO_GSI_SELF_AUTHORIZATION
	      Authorize the peer if the peer has the same identity as ourselves.

       GLOBUS_XIO_GSI_IDENTITY_AUTHORIZATION
	      Authorize the peer if the peer identity matches the identity set in the target name.

       GLOBUS_XIO_GSI_HOST_AUTHORIZATION
	      Authorize the peer if the identity of the peer matches the identity of the peer hostname.

Author
       Generated automatically by Doxygen for globus xio gsi driver from the source code.

Version 2.3							  Mon Apr 30 2012							  Types(3)
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