Coyote Point Systems Equalizer Spezifikationen PDF herunterladen (Seite 323)

100

101

Some function arguments can take the form of a regular expression

. Note that you cannot put regular

expressions.

Matching regular expressions (using *_regex() functions) is many times more

processing-intensive than using other match functions. It is usually possible to

avoid using regular expressions by carefully crafting match expressions using

other functions. For example, the following regular expression match:

dirname_regex("(two|four|six|eight)")

Can be replaced by the more efficient:

dirname_substr("two") ||

dirname_substr("four") ||

dirname_substr("six") ||

dirname_substr("eight")

Match Bodies

Match

bodies

specify the actions to take if the match expression selects the request. This is specified in the form

of statements that provide values to variables used by the load balancer to process the request. The most

common (and most useful) match body selects the set of servers (server pool) over which to apply the load

balancing.

The servers assignment statement takes a comma-separated list of server names, which specifies the set of

servers to be used for load balancing all requests that match the expression in the match rule. The reserved server

names all and none specify respectively the set of

all

servers in the virtual cluster and

none

of the servers in the

virtual cluster. If you do not assign servers, none will be available for load balancing; as a result, the connection to

the client will be dropped.

In general, you can override most cluster-specific variables in a match body. One useful example of overriding

variables is as follows:

flags =!once_only;

which would load-balance across the specified server pool (which first must be defined in the virtual cluster) and

also turn off the once_only flag for the duration of processing of that connection.

Regular expressions are specified according to IEEE Std 1003.2 (“POSIX.2”).

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Equalizer Administration Guide

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