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Jason Rahm

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Top Stories by Jason Rahm

We’ve covered pushing images from LTM before with Kirk’s excellent perl script work on sorry pages.  But that’s not the only thing you can host images for, and it’s not the only approach.  DevCentral community user kevin.stewart crafted up a nifty bash script to achieve the same ends, and gobbles up every image in /var/images, b64 encodes them, then drops them into a class.  The script is minimal in lines, but powerful in output: #!/bin/bash ## clear /var/class_build/images_build.class echo -n "" > /var/class/images.class; ## loop through real images and create base64 data for images_build.class for i in $(ls /var/images); do   echo \"`echo $i |tr '[:upper:]' '[:lower:]'`\" := \"`base64 /var/images/$i |tr -d '\n'`\", >> /var/class/images.class; done This results in a class with lines that look like this: "favicon.ico" := "iVBORw0KGgoAAAANSUhEUgAAAJ8AAACfC…” Create the c... (more)

Live from Microsoft Tech Ed: Final Day

So I guess I’m on the even days plan here at Tech Ed, today being the fourth and final day of Tech Ed…  Yesterday I got the chance to walk around the exhibitor hall and take a look at the exciting offerings on the floor.  Microsoft had three very large sections with breakout booths for all their product offerings.  I stopped and chatted with a few experts in the Server 2008 R2 virtualization offerings, and watched a couple System Center demos as well.  Speaking of System Center, did you know F5 has a management pack for System Center?  I talked to several booth visitors yesterday... (more)

Mitigate Java Vulnerability with iRules

I got a request yesterday morning to asking if there was a way to drop HTTP requests if a certain number was referenced in the Accept-Language header.  The user referenced this post on Exploring Binary.  The number, 2.2250738585072012e-308, causes the Java runtime and compiler to go into an infinite loop when converting it to double-precision binary floating-point.  Not good.  Twitter is ablaze on the issue, and there is a good discussion thread on Hacker News as well.  So how do you stop it?  At first, this appeared to be a no-brainer, just copy that string and drop if found in that... (more)

The Wait Is Over: Edit Your iRules on Linux!

DevCentral has many rock star contributors.  Most are not affiliated officially with F5 Networks, or DevCentral for that matter, but there are several F5ers who believe in the community, and really believe in the F5 story.  One of those F5ers is Matt Cauthorn, or as you know him in the community, L4L7.  You may recognize Matt as the author of pyControl.  Well, not only did he provide this entrance to a better iControl experience, he has also delivered in a major way with his Vim plugin for editing iRules (utilizing pyControl of course to make those calls to BIG-IP).  I had toyed ... (more)

Networking Options with LTM VE

Virtualization Expo on Ulitzer If you haven’t yet downloaded the  BIG-IP LTM VE trial, I highly suggest you do.  It is a fully-functional LTM, rate-limited to 1Mbps throughput.  If you’re not familiar with virtualized environments, hopefully this blog will fill in some blanks for how to get started on the network front. Getting Started Before downloading your VE image, you need to choose what virtualization environment you’re installing into.  The supported options in the type 1 hypervisor are VMWare ESX version 4 and ESXi version 4.  For the type 2 hypervisor (requiring a host O... (more)