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Resource based http load balancing

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Old 11-28-2011
Resource based http load balancing
Hi all,

I am looking for a solution to the following issue.
Basically, we are going to be implementing a series of front end splunk search heads (basically IO intensive web servers).
And wish to automatically redirect a new connection to the search head from the pool with most available resources (ie. least load).

I would like to be able to do this via an apache based load balancing solution, as I have used it in the past. However, not sure how to go about balancing by available resources.

I have a strong knowledge in SNMP and Apache so, if there is anyway to do it, I am sure I could tackle it.

Cheers guys,
Aaron.

---------- Post updated at 10:43 AM ---------- Previous update was at 09:52 AM ----------

As I can't find anything I am now looking into modifying a sub module for the mod_proxy_loadbalancer module.

I found the sub module to work off of here:
asf - Revision 1207701: /httpd/httpd/trunk/modules/proxy/examples

Do you think I am working in the right direction?

I know alot of perl/bash but, no C... so, I am now twidling in that... :S
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webserver

WEBSERVER(1)							       mrtg							      WEBSERVER(1)

NAME

       webserver - hints for web server configuration

SYNOPSIS

       If you want people to actually see the results of your network monitoring efforts you will need a webserver.

       This document lists some configuration hints for webservers. Contributions welcome.

APACHE

       Configuring mod_expire

       A big issue with mrtg monitoring data is the expiery time.  All these nice graphs you can create are only valid for a short time.  If you
       do not take special action some webbrowsers will not notice this and you may end up with people seeing old data because of caching issues.

       The apache module mod_expire allows you to setup special expiery properties for individual file.

       Here is an example for how this may look for an mrtg web directory.  The configuration directives can be stored into a .htaccess file.

	############################################################
	# Example .htaccess for use with apache-1.2 and mod_expire.
	# (mod_expire come with apache-1.2 but you have to explicitly
	# activate it when compiling the httpd ...)
	#############################################################
	#
	<Files "*-day.png">
	ExpiresActive On		  # enable expirations
	# five minutes
	ExpiresDefault M300
	</Files>

	<Files "*-week.png">
	ExpiresActive On
	ExpiresDefault M1800
	</Files>

	<Files "*-month.png">
	ExpiresActive On
	ExpiresDefault M7200
	</Files>

	<Files "*-year.png">
	ExpiresActive On
	ExpiresDefault M86400
	</Files>

	<Files "*.html">
	ExpiresActive On
	ExpiresDefault M300
	</Files>

	# index.html is not automatically generated
	<Files "index.html">
	ExpiresActive Off
	</Files>

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3rd Berkeley Distribution					      2.9.17							      WEBSERVER(1)