Back in October, my son’s robotics team said “Hey! You work for a
software company, can you build us an application that will help us with
scouting and competitions?” Foolishly, ego stepped in before a careful
outsourced review of my existing skills could take place, so I said “Sure!
Not a web developer, but how hard could it be?”
Seriously… how hard could this be? I see web application traffic all the
time. On the wire. And I can even manipulate that traffic at the protocol
level and do amazing things with it programmatically. But…changing
application traffic in flight is not development of that application. Nor is
it an understanding of all the considerations one must evaluate and handle to
get from idea to solution. So yeah, it is hard. Dang hard. Actually, getting
to a dynamic web experience "hello world” is easy, but getting to a working
application? Not so ea... (more)
It's not an uncommon problem trying to figure out where to plant that sorry
page in the event your farm is down. It's also not an uncommon solution to
just use your BIG-IP to issue a text-only HTTP::respond. It works, but it's
not, how do you say, visually appealing? You want to say sorry and mean
it. With pictures. If you take a stroll through the iRules codeshare,
you'll notice several solutions to this problem. All of them work, with a
variety of methods, but user kirkbauer's entry takes it to another level.
Kirk's sorry page irule generator (written in perl) takes all ... (more)
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)
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)
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.
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)