I had the same difficulties when start to learn about this.
A few weeks later, and many hours testing, gave me some knowledge.
Im not an expert, but could learn about some basic concepts.
Content Rule : A kind of Match Rule, where the best match ones, deliver traffic for the "services" you include it in.
Services : The server/machine, where u want to balance. It has the keepalive feature to dynamically learns the up/down service.
If u had configured in the matching content rule 2 services, to balance between 2 servers, u must have 2 services configured.
That keepalive could be done by protocol, icmp, http, port x, y, z, etc...
Well, we could be here writing many concepts more, but if you need more specific information, you could ask here everytime you want.
Best Regards,
Bruno Petrónio
