Re: [squid-users] Adjusting Parent Cache weight based on acl

Pieter De Wit wrote:
> Hello Everyone,
>
> Although I haven't reached the stage yet of needing the following
> feature I thought I might as well start talking about it soon. I would
> like to suggest (if there isn't already a way of doing this) the
> following idea for Squid:
>

I'm not certain of the exact behaviour in squid 2.6. BUt what I say
below is derived directly from experience in the codebase of 3.0 in
places that should not have change much.

> Adjusting a Parent Cache's weight based on acl - What this means is the
> following:
>
> I have a main proxy server called (let's say) main_proxy. I have two
> sibling proxy servers called child1_proxy and child2_proxy. Child1 and 2
> proxies both have there own internet link of different sizes (the one is
> adsl and the other one a E1). Now to balance requests between them is
> simple, just add them with the same weight.

This is default on weighted-peer algorithms. To pre-balance the weight=N
option is available on cache_peer config options.

> To use one for a set of
> users etc is simple. What I would like to do is dynamically control the
> weight of each cache, based on acl's

This is done directly allow.deny to any given peer via ACLs already, and
indirectly via sucessfull data accounting which modifies the weighting.

>
> Let's say Client A is an exec and needs high speed caching, I want some
> requests to go over the adsl and some over the E1. Now I would like to
> do this during some time or something else...all do'able with the
> current acl's, but what if I want to change the proxy based on
> system/network load or some external factor,

For system-load balancing use --enable-icmp and install the pinger "make
install-pinger".

> or I want to say something
> like, when Client A requests it from username "user" and from IP a.b.c.d
> (say a dial up) then decrease the weight of the adsl proxy.

This is already implemented in all weighted-peering algorithms in squid.

cache_peer_access allows/prevents any data being retrieved from a peer.
Each time data is successfully retrieved it adds to the weighting of the
useful source peer.

>
> I hope this is making sense, since I feel like i havn't really carried
> over the idea "correctly".

I hope I have understood you correctly and have been helpful.

Happy holidays.

Amos
Received on Fri Dec 14 2007 - 01:11:45 MST