RE: [squid-users] Question on sibling relationships

You might want to change your existing setup. You can probably add a load
balancer or another squid machine in front of the cache array. The front-end
squid machine (D) will then act as your "load balancer" (using CARP) or
pointing to the three squid proxies as parents.

ISP1 ISP2 ISP3
  | | |
  | | |
+-+-+ +-+-+ +-+-+
| A |--sibling--| B |--sibling--| C |
+-+-+ +-+-+ +-+-+
  | | |
  | +-+-+ |
  +-------------| D |-------------+
                +---+

You can also lower the TTL between A<->D, B<->D, or C<->D so that it doesn't
wait.

-----Original Message-----
From: Gino LV. Ledesma [mailto:gino@cersa.admu.edu.ph]
Sent: Thursday, September 19, 2002 3:37 PM
To: squid-users@squid-cache.org
Subject: [squid-users] Question on sibling relationships

Hi,

        I'd like to clarify how squid accesses the Internet when its part of
a hierarchy. I've read the Squid config guides and FAQ and it doesn't
directly address the questions. If a proxy is part of a hierarchy, say it
has some siblings and a parent, how does that particular proxy handle a
network error when, say, its link to its parent dies, but the link toward
its siblings (and assuming its siblings connection to the internet is ok) is
ok? Does the proxy then proxy requests through its siblings? I know that the
proxy queries its siblings before its parent, and it only queries the parent
if its siblings do not return the object requested.

        This is the scenario I'm facing. The proxy cluster is configured as
follows:

 ISP1 ISP2 ISP3
  | | |
  | | |
+-+-+ +-+-+ +-+-+
| A |--sibling--| B |--sibling--| C |
+-+-+ +---+ +-+-+
  | |
  +------------sibling------------+

        The problem I'd like to (or have to) address is that, if one of the
proxies's direct connection is for some reason unavailable, the proxy must
be able to be "functional" by querying its siblings. I guess in a longer
term, is it possible for squid to be configured to dynamically adapt to its
network connections?

============================
Gino LV. Ledesma
Campus Network Group
Ateneo de Manila University
http://cng.ateneo.net/
Received on Thu Sep 19 2002 - 01:58:10 MDT