Comments on: DNS-based load balancing for virtual users http://www.jds.net.au/tech-tips/dns-based-load-balancing/ Expert consulting services with HP Software Tue, 31 Aug 2010 10:19:03 +1000 http://wordpress.org/?v=2.8.6 hourly 1 By: Nick Johnson http://www.jds.net.au/tech-tips/dns-based-load-balancing/#comment-9437 Nick Johnson Thu, 17 Dec 2009 06:17:45 +0000 http://www.jds.net.au/?p=1157#comment-9437 very useful info... here's some additional considerations.... - if this is being done for the purposes of bypassing a Load Balancer (LB), run at least once in vugen (with full logging "advanced trace" enabled) to ensure the IP address of the LB is not used by the script. - absolute references within pages to components will not be replaced with the IP address specified in the modified code and thus should be checked for on playback & re-recorded explictly in URL mode if they exist. - also, other hosts that may be referenced in the script may not be replaced with the desired IP address, and thus could send you back to the LB (or other servers) - these are worth checking for too. cheers Nick very useful info… here’s some additional considerations….

- if this is being done for the purposes of bypassing a Load Balancer (LB), run at least once in vugen (with full logging “advanced trace” enabled) to ensure the IP address of the LB is not used by the script.

- absolute references within pages to components will not be replaced with the IP address specified in the modified code and thus should be checked for on playback & re-recorded explictly in URL mode if they exist.

- also, other hosts that may be referenced in the script may not be replaced with the desired IP address, and thus could send you back to the LB (or other servers) – these are worth checking for too.

cheers
Nick

]]> By: Stuart Moncrieff http://www.jds.net.au/tech-tips/dns-based-load-balancing/#comment-7814 Stuart Moncrieff Wed, 07 Oct 2009 22:29:33 +0000 http://www.jds.net.au/?p=1157#comment-7814 Speedmaster - no, that is not what "sticky" load balancing is. Cheers, Stuart. Speedmaster – no, that is not what “sticky” load balancing is.

Cheers,
Stuart.

]]> By: Speedmaster http://www.jds.net.au/tech-tips/dns-based-load-balancing/#comment-7809 Speedmaster Wed, 07 Oct 2009 19:40:10 +0000 http://www.jds.net.au/?p=1157#comment-7809 <em>>> "The visitor will usually cache the results of the DNS lookup for a period of time (30 minutes in Internet Explorer), so their requests will all be sent to the same web server"</em> I think this is what is sometimes referred to as "sticky" load-balancing? >> “The visitor will usually cache the results of the DNS lookup for a period of time (30 minutes in Internet Explorer), so their requests will all be sent to the same web server”

I think this is what is sometimes referred to as “sticky” load-balancing?

]]> By: Stuart Moncrieff http://www.jds.net.au/tech-tips/dns-based-load-balancing/#comment-1492 Stuart Moncrieff Wed, 04 Mar 2009 04:34:17 +0000 http://www.jds.net.au/?p=1157#comment-1492 Tomer had an interesting alternative solution to this problem, which avoids the severe limitation that this solution has for pages that have off-site resources. His solution was to modify the hosts file entry for the domain name on each iteration and to turn off DNS caching under Runtime Settings > Internet Protocol > Preferences > Advanced Options, so that VuGen would pick up the new value. Tomer had an interesting alternative solution to this problem, which avoids the severe limitation that this solution has for pages that have off-site resources.

His solution was to modify the hosts file entry for the domain name on each iteration and to turn off DNS caching under Runtime Settings > Internet Protocol > Preferences > Advanced Options, so that VuGen would pick up the new value.

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