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Deploying Equalizer with MS Terminal Services

Deployment Guide

Appendix A: Terminal Services Server Agent

The sample Server Agent included in this appendix is intended to be installed

and run on a Windows Terminal Services enabled server to provide accurate

probe feedback to Equalizer. It can be used in any Equalizer / Terminal Services

configuration to avoid probing the Terminal Services port on the server and, by

doing so, to avoid consuming a Terminal Services license. The general procedure

is to:

•

Turn TCP and ACV probing off for the server (enable "don't probe" on the

server's configuration tab).

• Run a program on the terminal server (a "server agent") to return server

status information. The server agent can be configured to return simple

up/down status, or an indication of the load on the server. A sample

server agent is below. By default, server agents use port 1510, but this

can be changed.

• Enable the cluster "require agent response" flag to require a server agent

response in order to mark the server up.

The complete procedure is provided in Step 10 and 11 on pages 16 and 17.

Sample Server Agent

1. #--------------------

2. # srvrgnt-msts.pl

3. #--------------------

6. use strict;

7. use Socket;

9. # YOU MUST SET maxconn to the same value used for maximum connections on

10. # the MS Terminal Server on which this agent will be installed.

11. # As delivered, this script uses an arbitrary default of 75.

12. my $maxconn=75;

13.

14. # YOU MUST SET port to the same value used for server agent port on

15. # Equalizer. The Equalizer default is 1510

16. my $port = 1510;

17.

18. # create a socket and set the options, set up listen port

19. my $proto = getprotobyname('tcp');

20. socket(SERVER, PF_INET, SOCK_STREAM, $proto) or die "socket: $!";

21. setsockopt(SERVER, SOL_SOCKET, SO_REUSEADDR, 1) or die "setsock: $!";

22. my $paddr = sockaddr_in($port, INADDR_ANY);

23.

24. # bind to the port, then listen on it; print diagnostic

25. bind(SERVER, $paddr) or die "bind: $!";

26. listen(SERVER, SOMAXCONN) or die "listen: $!";

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