11 Nov 2011 @ 2:13 PM 

Often we call services internally, whether it is a mail gateway or a web service. In production, if high availability is a requirement, we want to create a virtual ip for the service and add two or more physical servers as listeners.
I usually use layer 7 service pools when network load is low, and the overhead of going through the stack to get to the layer 7 headers is acceptable. For SSL offloading it is essential. Note that I don’t use the load balancer to do the redirect; I like to use nginx for that. Often, conditions will arise (force secure for this url) that are easier to manage with nginx, and I like the flexibility of being able to use the nginx feature set for customer requests.
However, on a Barracuda, the only way to create an internal load balancer pool is to use “TCP Proxy” service type, not “Layer 4 – TCP”. Does not seem to be documented anywhere, but this is the only way it works.
Assuming you are running at least version 3.6 firmware, you can create the Service Name, and give it an IP and Real Servers, and expose the Virtual IP to the LAN.

Posted By: caunter
Last Edit: 11 Nov 2011 @ 02:13 PM

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Categories: IIS7, Varnish Cache, Video CDN
 17 Feb 2011 @ 4:42 PM 

This is completely undocumented so I thought I’d share.
Set app pool A in advanced settings, to have affinity True, and mask 255. It will use the first 8 processors. Confirm in task manager.
Set app pool B affinity True, and mask 65280. It will use processors 9-16. Works.

Posted By: caunter
Last Edit: 17 Feb 2011 @ 04:44 PM

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 08 Oct 2010 @ 10:56 AM 

Run this command to output all the C that varnishd compiles at runtime:

/usr/local/sbin/varnishd -C -f ./default.vcl > file

Posted By: caunter
Last Edit: 08 Oct 2010 @ 10:56 AM

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 15 Sep 2010 @ 12:20 PM 

If you want to start varnishd with
-s file,/usr/cache/topscache,30720000000
use
dd if=/dev/zero count=60000000 of=/usr/cache/topscache

This works well for a server with 32GB ram.

Posted By: admin
Last Edit: 15 Sep 2010 @ 12:20 PM

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 27 Aug 2010 @ 9:26 PM 

This is different, and useful website speed test, especially because of the external element count and total page load time. Enjoy.

Posted By: admin
Last Edit: 27 Aug 2010 @ 09:26 PM

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