On Wed, 17 Dec 2003, Cavanagh, Kevin B wrote:
Hi there,
Please forgive me if this question has been asked/answered before (I
searched the FAQs but quickly became too confused by all the various
postings regarding load balancing, etc).
We currently have six RedHat Linux V8.0 servers running Squid V2.5
Stable in the following parent/child proxy chain:
User U Iprism URL filters Squid caching (child) HTTP Anti-virus
(parent) Internet
We have six of each - with each currently having a one-to-one
relationship (ie. IPRISM1P SQUID1 AV1 INET, etc).We would like
to create a load-balanced situation here if at all possible.
probably the only part we can help you with is the way that SQUID selects
which AV parent to send a request to.
One approach is to make a DNS name or /etc/hosts entry for the AV servers
that has all their IP addresses. Then you put a single line in squid.conf:
cache_peer av-servers.example.com parent 0 no-query
Another approach is to list all servers separately and use the round-robin option
cache_peer 172.16.0.1 parent 0 no-query round-robin
cache_peer 172.16.0.2 parent 0 no-query round-robin
cache_peer 172.16.0.3 parent 0 no-query round-robin
cache_peer 172.16.0.4 parent 0 no-query round-robin
cache_peer 172.16.0.5 parent 0 no-query round-robin
cache_peer 172.16.0.6 parent 0 no-query round-robin
Yet another approach is to use CARP:
cache_peer 172.16.0.1 parent 0 no-query carp-load-factor=0.16
cache_peer 172.16.0.2 parent 0 no-query carp-load-factor=0.16
cache_peer 172.16.0.3 parent 0 no-query carp-load-factor=0.17
cache_peer 172.16.0.4 parent 0 no-query carp-load-factor=0.17
cache_peer 172.16.0.5 parent 0 no-query carp-load-factor=0.17
cache_peer 172.16.0.6 parent 0 no-query carp-load-factor=0.17
Duane W.
