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Match Rules

Using Match Rules

The ability to make load balancing decisions based on the content of a client request is what separates Layer 7

processing from the processing options available at Layer 4. For Layer 7 HTTP and HTTPS clusters, Match Rules

provide fine-grained control over load balancing decisions based on the content of the client request. If you need to

be able to route requests to the servers in a cluster based on the content of the request, Match Rules are the

answer.

Layer 7 HTTP and HTTPS clusters can use logical constructs called “Match Rules” to control the processing of

the incoming data stream from clients. Match rules extend the Layer 7 load balancing capabilities of HTTP and

HTTPS clusters by allowing you to define a set of logical conditions which, when met by the contents of the

request, trigger the load balancing behavior specified in the match rule.

Typically, a match rule selects the subset of servers that the load balancing algorithms will use for a particular

request. By default, a request is load balanced over all the available non-spare servers in a cluster. Match rules

allow you to select the group of servers, or server pools, that will be used to load balance the request.

For each virtual cluster, you can specify any number of match rules. For each match rule, you specify the subset

of servers or server pools that can handle requests that meet the rule criteria.

A match rule provides custom processing of requests within connections. Equalizer provides common and

protocol-specific match functions that enable dynamic matching based on a request’s contents. Protocol-specific

match functions typically test for the presence of particular attributes in the current request.

For example, a Layer 7 HTTP virtual cluster can specify matching on specific pathname attributes to direct

requests to subsets of servers or server pools so that all requests for images are sent to the image servers. The

difference between load balancing with and without match rules in such a situation is illustrated in the following

figure.

Most client requests are a mix of requests for text and graphics. Layer 7 processing without Match Rules balances

requests across the specified server pool so that each server instance in the server pool will see a mix of text and

graphics requests. This means that all text and graphics must be available on each server pool.

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