Installation guide

Using the Load Balancing Plug-in: libresonate

A sample of this is shown below:

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin watching thread pool sleep

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin aggressive setting is

FALSE

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin poll time set to 2000

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin HighThreshold set to 5

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin LowThreshold set to 1

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin event executable path set

to /tools/ns/bin/perl5

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin low command set to

/usr/netscape/ent41/plugins/loadbal/CmdLow.pl

[12/Jun/2000:09:36:35] verbose (20685): Resonate plugin high command set to

/usr/netscape/ent41/plugins/loadbal/CmdHigh.pl

This is what will the log entries will look like when LogVerbose on is set and the plugin is

activated:

[12/Jun/2000:09:40:12] verbose (20699): Resonate plugin reducing load.

[12/Jun/2000:09:40:14] verbose (20699): Resonate plugin reducing load.

[12/Jun/2000:09:40:16] verbose (20699): Resonate plugin reducing load.

[12/Jun/2000:09:40:18] verbose (20699): Resonate plugin reducing load.

[12/Jun/2000:09:40:20] verbose (20699): Resonate plugin reducing load.

[12/Jun/2000:09:40:30] verbose (20699): Resonate plugin increasing load.

Testing

A simple way to test the load balancer is to use an NSAPI that prints a little HTML page and then

calls

sleep() for a period to simulate execution time. This way one can build up a simulated load

on the server and ensure that the load balancer commands are working properly.

To configure the sample program, first we want to add a new MIME type so this isn’t run for every

request. Modify

config/mime.types and add a line like this:

type=magnus-internal/sleep exts=sleep

Then create a file in your document-root directory with the extension of .sleep. It doesn’t matter if

anything is in this file, it is used as a placeholder only.

To load the module into the server, add a line like this to your

obj.conf, changing shlib to the

location of the library. You also have to set

pool to the name of the thread pool you defined earlier:

Init fn="load-modules" funcs="dosleep"

shlib="/usr/netscape/ent41/plugins/nsapi/examples/dosleep.so" pool="sleep"

Then add this Service line where the others are found (note that order is not important):