I've had some success today trying out a new squid configuration using carp. What I was trying to do before was use the PEN load balancer in round-robin mode to send http requests to my two squid nodes, each of which was configured to reference one another as nodes in the carp array. This wasn't working properly. I would find forwarding loops or both nodes would cache the same object defeating the purpose. Supposedly squid can be setup that way, but I can't figure out how to get it to work like that. So, what I am doing instead is more like what this article appears to depict: http://www.nedworks.org/~mark/presentations/san/Wikimedia%20architecture.pdf and that is two layers of squid. I've removed the PEN load balancer and now all of my requests will come into a 'router squid' configured like so: SQUID1: http_port 80 accel vhost vport cache_peer squid2.test.rob parent 80 0 carp weight=1 proxy-only cache_peer squid3.test.rob parent 80 0 carp weight=1 proxy-only Now, I will scale the 'caching squid' layer by adding more machines to the list of cache peers in the router squid. The configuration for the cache squids is as follows: SQUID2: http_port 80 accel vhost vport cache_peer freebsd1.test.rob parent 80 0 originserver SQUID3: http_port 80 accel vhost vport cache_peer freebsd1.test.rob parent 80 0 originserver freebsd1 is my static content server which all squids are trying to represent in my reverse proxy cluster. After testing access attempts to multiple files I find that some files are always routed to squid2 and others are always routed to squid3. It appears carp is working properly now. The only problem I'm currently seeing is that my router squid checks itself to see if it has any cached files before 'routing' the request to the carp nodes: X-Cache: MISS from squid1.test.rob X-Cache-Lookup: MISS from squid1.test.rob:80 Since I want squid1 to simply use the carp protocol to determine which child has the content instead of caching content itself, is there a way I can tell squid1 to not look internally for cached files? -Rob
