The real Slim Shady
Historically when an application team needed compute and storage resources they would kick off a workflow that pulled in several teams to design, procure and deploy the required infrastructure (compute, storage & network). The whole process generally took a few months from request to delivery of the infrastructure.
The reason for this onerous approach was really that application groups generally dictated their choice of compute technology. Since most applications scaled vertically, the systems and storage scaled likewise. When the application needed more horsepower, it was addressed with bigger more powerful computers and faster storage technology. The hardware for the request was then staged followed by a less-than-optimal migration to the new hardware.
The subtlety that gets lost regarding server virtualization is that a virtualization cluster is based on [near] identical hardware. The first machines that were virtualized where the ones who’s computer and storage requirements could be met by the hardware that the cluster was based on. These tended to be the applications that were not vertically scaled. The business-critical vertically scaled applications continued to demand special treatment, driving the overall infrastructure deployment model used by the enterprise.
The subtlety that gets lost regarding server virtualization is that a virtualization cluster is based on [near] identical hardware. The first machines that were virtualized where the ones who’s computer and storage requirements could be met by the hardware that the cluster was based on. These tended to be the applications that were not vertically scaled. The business-critical vertically scaled applications continued to demand special treatment, driving the overall infrastructure deployment model used by the enterprise.
The data center Continue reading
Live digital threats
I wanted to bring these free tools to my blog to keep track of them, as most probably I will forget about, and to share with anybody interested in gathering information in the security areas. First tool was revealed to my in tweet from Greg Ferro: Blog post: Response: Digital Attack Map http://t.co/rEhfYAN77c pic.twitter.com/0O1L6kELsK — […]Network Function Abstraction Redux (Now with DevOps!)
I wrote a few days ago about how cool projects like OpenDaylight are abstracting network functions into consumable policies that non-network folks can use (and that’s a good thing!). I felt this quick follow-up was necessary. Providing the right tools to the application folks that allow network provisioning to occur as quickly as anything else that’s software-defined, such as servers, while keeping those tools light on the learning curve, is exactly what the apps folks have been wanting from the network for the last 10 years or so.Network Function Abstraction Redux (Now with DevOps!)
I wrote a few days ago about how cool projects like OpenDaylight are abstracting network functions into consumable policies that non-network folks can use (and that’s a good thing!). I felt this quick follow-up was necessary. Providing the right tools to the application folks that allow network provisioning to occur as quickly as anything else that’s software-defined, such as servers, while keeping those tools light on the learning curve, is exactly what the apps folks have been wanting from the network for the last 10 years or so.Cisco switches and smartport macros
Smartport macros are not more than some templates you can define on Cisco switches that will apply the same configuration on multiple ports. It’s not a subject that needs too many discussions, but it can be useful for your Cisco certification preparation or real life Cisco switch administration. Configuration is very simple and it goes […]Real world SDN: VMware NSX on Packet Pushers
If you like to listen to geeky networking podcasts on your way to the office, this is surely one not to miss. Scott Lowe and I appeared as guests on the Packet Pushers podcast, sponsored by VMware, and hosted by Ethan Banks and Greg Ferro to discuss the technical details of VMware NSX, and the […]Installing VMware tools on Cisco ACS
As of ACS v5.4 Cisco has finally included VMware tools for their ADE OS. Unfortunately, when you upgrade, they do not get installed automatically as the installation is triggered during the initial install. This post is for those of us that have upgraded to version 5.4 and didn’t choose to do a fresh install.
First of all, you need to get your hands on the Root Patch. This Root Patch allows you root shell access to the ADE OS, which is just a customized version of Redhat Linux. You can get this patch from TAC by asking them nicely, or telling them you need to install VMware tools on your ACS 5.4 install. I’m sure if you’re clever you can find a copy out in the wild as well. But your mileage may vary…
Installing the ACS Root Patch
This part is pretty simple. Using the ADE OS application installer, install the package using a predefined repository…
acs/eladmino# application install RootPatch-ACS-5-4.tar.gz ftp Save the current ADE-OS running configuration? (yes/no) [yes] ? Generating configuration... Saved the ADE-OS running configuration to startup successfully Initiating Application installation... Application successfully installed acs/eladmino#
Using the Root Patch
After the install, you Continue reading
Five Functional Facts about OTV
Following on from my previous “triple-F” article (Five Functional Facts about FabricPath), I thought I would apply the same concept to the topic of Overlay Transport Virtualization (OTV). This post will not describe much of the foundational concepts of OTV, but will dive right into how it actually functions in practice. A reasonable introduction to OTV can be found in my series on Data Center Interconnects.
So without any more preamble, here are five functional facts about OTV.
#1 – OTV Adds 42 Bytes of Overhead
OTV, being an encapsulation technology, adds additional headers to the encapsulated payload. Without rehashing too much of the basics, OTV extends a Layer 2 domain across a Layer 3 cloud. In order to preserve the Layer 2 semantics on either side of the cloud, OTV scoops up the entire Layer 2 packet on one side, transports it across the cloud in the middle, and puts it on the LAN in the other side. This preserves the entire Ethernet header including the original source/dest MAC, and even the CoS bits and VLAN tag.
So to begin with, we’re putting a (potentially) full-sized Ethernet frame – with headers – inside another Ethernet frame. That Continue reading
Show 165 – Running Code Is What Defines The Rules
Ethan Banks and Greg Ferro are joined on this week’s Packet Pushers podcast by Teren Bryson, Paul Stewart, and Michele Chubirka. This is a community show, meaning it’s just a bunch of engineers chatting about the industry and our experiences. No vendors looking over our shoulders at all. Here’s what we yammer on about. Topics […]
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The post Show 165 – Running Code Is What Defines The Rules appeared first on Packet Pushers Podcast and was written by Ethan Banks.
OpenDaylight and Those Pesky Southbound APIs
In case you’ve noticed I’ve been pretty quiet - I’d be lying if I said my day job wasn’t at least partially to blame. However, a good chunk of my free time has also been spent jumping back into the software development game. I was never really a “programmer” in the common sense - I’ve always written code strictly as part of an infrastructure effort. My first “job” that involved writing code was on a VoIP team for a retail company, creating web service-type applications that interacted with the voice infrastructure; think “IVR” on steroids.OpenDaylight and Those Pesky Southbound APIs
In case you’ve noticed I’ve been pretty quiet - I’d be lying if I said my day job wasn’t at least partially to blame. However, a good chunk of my free time has also been spent jumping back into the software development game. I was never really a “programmer” in the common sense - I’ve always written code strictly as part of an infrastructure effort. My first “job” that involved writing code was on a VoIP team for a retail company, creating web service-type applications that interacted with the voice infrastructure; think “IVR” on steroids.F5 LTM Encrypted Cookie Insert Persistence
The purpose of a load balancer is to distribute client connections to multiple servers to increase load capacity and provide high availability. One common requirement of load balanced applications, since most application servers maintain session information on the local box, is that a client must stay locked to a single server for the duration of […]
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The post F5 LTM Encrypted Cookie Insert Persistence appeared first on Packet Pushers Podcast and was written by Eric Flores.
Five Functional Facts about OTV
Following on from my previous “triple-F” article (Five Functional Facts about FabricPath), I thought I would apply the same concept to the topic of Overlay Transport Virtualization (OTV). This post will not describe much of the foundational concepts of OTV, but will dive right into how it actually functions in practice. A reasonable introduction to OTV can be found in my series on Data Center Interconnects.
So without any more preamble, here are five functional facts about OTV.
BGP – Suppress-Inactive and Next-Hop Matches
This post represents the solution and explanation for quiz-16. Advertising inactive BGP routes can, sometimes, depend on other conditions. This article presents some scenarios with inactive BGP prefixes, suppress-inactive and RIB-NH Matches.
Last Day to Buy a Poster is October 31
I've been selling physical copies of my 36x24" IOS Interior Routing Protocols poster for a while now. Unfortunately, Google Checkout is going the way of Google Reader next month and soon I will no longer be able to accept payments. Thus, October 31st will be the last day to order copies of the poster.
The PDF will of course remain freely available for download if you'd like to print the print poster yourself after the deadline.
Cisco UCS SDK for Python, and Building in Windows
So I’m tackling a little side project - and that is to replicate my Cisco UCS configuration scripts, currently in PowerShell, but instead in Python. While the UCS API is actually an XML interface on the Fabric Interconnects, Cisco has created a module of cmdlets called PowerTool so that this service can be easily consumed, rather than deal with XML serialization directly. For instance, once authenticated, you can do cool stuff like get a list of all Service Profiles on a system:Cisco UCS SDK for Python, and Building in Windows
So I’m tackling a little side project - and that is to replicate my Cisco UCS configuration scripts, currently in PowerShell, but instead in Python. While the UCS API is actually an XML interface on the Fabric Interconnects, Cisco has created a module of cmdlets called PowerTool so that this service can be easily consumed, rather than deal with XML serialization directly. For instance, once authenticated, you can do cool stuff like get a list of all Service Profiles on a system:Review: Information Storage and Management
EMC Education Services Safari | Amazon I’m a routing geek. Not a storage, compute, SONET, web design, and mobile phone geek — a routing geek. But even routing geeks need to know something about the stuff that attaches to the network right? In the spirit of learning something new, I recently picked up (and […]
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Java is to JavaScript as Car is to Carpet – a Beginner’s Guide
Some recent discussions at work have led me to the surprising realization that lots of people working in IT don't understand that Java and JavaScript are almost completely unrelated to each other. This is actually a fairly important misunderstanding to correct: it leads to wasted troubleshooting efforts, such as downgrading or upgrading Windows Java installations in response to browser JavaScript errors.I found the title of this blog entry in a StackOverflow post: "Java is to JavaScript as Car is to Carpet". That's pretty much it, in a nutshell. For the record, the only things that Java and JavaScript have in common are:
- They are both programming languages.
- The word "Java".
- Both came out of the web technology explosion of the early 1990s.
- Both are frequently encountered in the context of web browsers.
Back to the Basics…
Now that I’ve finished learning about SDN, and then studied for and passed my latest Cisco certification (CCNA Security, keeping that vendor certification path open!), I’ve gotten into the groove of studying at night (and I as I love IT, and specifically networking, it’s kinda become my hobby… I know, lame, right?) In any case, […]
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The post Back to the Basics… appeared first on Packet Pushers Podcast and was written by Will Dennis.