ZXTM Control API Overview and Reference 

Version 4.0

2.2  Adding a node to a pool 

Provisioning systems can dynamically deploy applications across servers, 

perhaps in reaction to increased server load.  This example demonstrates 

a Control API application that modifies the nodes that a pool balances 

traffic to. 

If the pool is using ZXTM's `Perceptive' algorithm (the preferred load 

balancing method for busy sites), then ZXTM will slowly ramp up the load 

on newly introduced nodes, gauging their potential performance, until 

they run at the same speed as the other nodes in the pool.  This `Slow 

Start' capability ensures that new nodes are not immediately overloaded 

with a large burst of traffic. 

2.2.1 Perl 

Example 

#!/usr/bin/perl  w 

use SOAP::Lite 0.60; 

# This is the url of the ZXTM admin server 

my $admin_server =  https://username:password@host:9090 ; 

# The pool to edit, and the node to add 

my $poolName = "test pool"; 

my $newNode  = "10.100.1.10:80"; 

my $conn = SOAP::Lite 

     > uri( http://soap.zeus.com/zxtm/1.0/Pool/ ) 

     > proxy("$admin_server/soap") 

     > on_fault( sub  { 

         my( $conn, $res ) = @_; 

         die ref $res ? $res >faultstring : 

             $conn >transport >status; } ); 

# Get a list of pools 

my $res = $conn >getPoolNames(); 

my @names = @{$res >result}; 

# Get the nodes for each pool 

$res = $conn >getNodes( \@names ); 

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