Re: [squid-users] Squid Cluster

From: Henrik Nordstrom <>
Date: Fri, 13 Feb 2004 22:26:47 +0100 (CET)

On Fri, 13 Feb 2004, JOHNSON DAVID R wrote:

> Has anyone successfully clutered squid boxes? if so what did you use?

What kind of cluster are you looking for?

Active-Backup, Farm of proxies, Active-Active, Farm of proxies, etc..

For Active-Backup type clustering any of the failover clustering methods
for your platform will work fine. But there rarely is a need for
Active-Backup type clustering of proxies as they do not contain valuable
information, so most prefer having all cluster members taking their share
of the load.

The easies form of active-active clustering is the farm of proxies, using
a proxy.pac script to direct the client to the appropriate proxy for the
request, and cache peering between the proxies for cache balancing of
clients not using proxy.pac and instead accessing the farm via a DNS-RR

For Active-Active type clustering the best method (if not using the farm
of proxies approach) is to use a load balancer infront of the proxies. You
can optionally run the load balancer function on one of the proxies but I
prefer having it on a dedicated box.

Linux-Virtual-Server is a very good load balancer and easy to set up on
any Linux flavor.

Received on Fri Feb 13 2004 - 14:26:53 MST

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