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articleirulesbig-ipdevnewstechtip March 09, 2011 by Jason Rahm
Did I lose you at “Documenting?”  Documentation is rarely at the top of the list of things we make time for, yet the practice is critical.  You never know when you’re going to see that iRule again, and if it’s six months later after an upgrade and you have to stare at code for a while just to figure out what its purpose is, well, that’s a problem.  With iRules, comments are not compiled into byte-code, so there is no performance hit taken with their presence.    Som...
articleavailabilitybig-ipdevnewstechtip January 21, 2011 by Jason Rahm
A good while back (Dec ‘07!), Deb wrote up hash load balancing in six pages of goodness.  She made some really good points in her introduction that bear repeating: Load balancing of cache and proxy servers has long been a standard task for F5's BIG-IP LTM. However, cache and proxies have unique requirements over other types of applications. It's not realistically possible to cache an entire site, let alone the Internet, on a single cache device. The solution is to intelligently load ba...
In the first article in this series “Automated Gomez Performance Monitoring”, I illustrated how to create an iRule that would automatically inject the required JavaScript code into your web pages to integrate your application with the Gomez Performance monitoring system. In part two titled “Automated Gomez Performance Monitoring Part 2 – DataCenter Identification”, I expanded on the first article by allowing you to add DataCenter specific identifiers into the Gomez script, thus enabling you to ...
In my previous article titled “Automated Gomez Performance Monitoring”, I gave an overview of Gomez and the partnership between F5 Networks and Gomez to assist users of both technologies to integrate the two together.  In that article, I illustrated how to use iRules to serve up the Gomez bootstrap JavaScript code eliminating the need to install in on a backend web server. The iRule is also used to automatically inject the client side JavaScript into the response stream for your webpages....
I recently completed a successful major LTM hardware and software migration which accomplished two high-level goals: ·         Software upgrade from v9.3.1HF8 to v10.1.0HF1 ·         Hardware platform migration from 6400 to 6900   I encountered several problems during the migration event that would have stopped me in my tracks had I not (in most cases) encountered them already during my te...
articlebig-ipnewstechtip May 25, 2010 by Jason Rahm
This isn’t the first time I’ve looked at optimization techniques with iRules. I’ve blogged about why testing matters, and hosted a small contest as a result of that testing (hmm, I think I still owe natty76 a t-shirt…) to give other iRulers out there an opportunity to find efficiencies.  Well, every now and then a post catches my eye and I start to think about the fundamental differences in approach to a problem.  A thread in the Adv Design/Config General Discussion forum, Bypassing a ...
Gomez provides an on-demand platform that you use to optimize the performance, availability and quality of your Web and mobile applications. It identifies business-impacting issues by testing and measuring Web applications from the “outside-in” — across your users, browsers, mobile devices and geographies — using a global network of 100,000+ locations, including the industry’s only true Last Mile. F5 and Gomez have partnered to provide a users of both technologies an easy way to integrate the t...
Having LTM-VE is nice, but setting things up so that you can actually use it for something is a different matter. There is a lot of information floating around out there about configuration ranging from Joe's Tech Tip to Lori's Architecture Reference to deployment guides. This article focuses on setting up a VMWare team that includes your BIG-IP and some test servers. Since I wanted this to be something you can re-create, all of the servers utilized in this Tech Tip are clones of a straight-for...
Last week we covered the basics on network configuration for BIG-IP LTM VE on the VMware Workstation/player hypervisors and the ESX/ESXi hypervisors.  This week we’ll cover a couple more options at your disposal. Option 1 – Add an Interface We’ve already established that the LTM VE only has two interfaces.  Technically, there are three, but one is reserved for the management interface, and as it doesn’t qualify for the wicked cool stuff, we’ll pretend it’s not there.  The first ...
Since the BIG-IP LTM VE is currently a trial version, you won’t be doing any production implementations.  That’s good in this case, because we’re going step outside the box a little and install pyControl on your shiny new toy.  As with any "hacked' solutions in the BIG-IP shell, it's best to deploy these in development and test scenarios, not production. Prerequisites Beginning in v10.1, python version 2.4 comes installed on the BIG-IP.  This makes the task a little simpler...
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