Why oh why?
So i have been using Juniper MX routers for some years now (mainly MX80’s) and have configured CoS in reasonably basic forms to suit $dayjob’s needs (mainly 4 queues). It turns out that even though the MX routers support 8 … Continue reading
Kubernetes 101 – External access into the cluster
In our last post, we looked at how Kubernetes handles the bulk of it’s networking. What we didn’t cover yet, was how to access services deployed in the Kubernetes cluster from outside the cluster. Obviously services that live in pods can be accessed directly as each pod has its own routable IP address. But what if we want something a little more dynamic? What if we used a replication controller to scale our web front end? We have the Kubernetes service, but what I would call its VIP range (Portal Net) isn’t routable on the network. There are a couple of ways to solve this problem. Let’s walk through the problem and talk about a couple of ways to solve it. I’ll demonstrate the way I chose to solve it but that doesn’t imply that there aren’t other better ways as well.
As we’ve seen, Kubernetes has a built-in load balancer which it refers to as a service. A service is group of pods that all provide the same function. Services are accessible by other pods through an IP address which is allocated out of the clusters portal net allocation. Continue reading
Performance of Hypervisor-Based Overlay Virtual Networking
Years ago I managed to saturate a 10GE uplink on a vSphere server I tested with a single Linux VM using less than one vCPU. On the other hand, squeezing 1 Gbps out of Open vSwitch using GRE encapsulation was called ludicrous speed not so long ago. Implementing overlay virtual networking in the hypervisor obviously carries a huge performance penalty, right? Not so fast…
Read more ...The Cisco CNPES Cert, First Exam (600-504) and Course
Do you think of yourself as a network engineer? Cisco’s Network Programmability Engineer Specialist (CPNES) certification represents Cisco’s first crack at a certification focused on network engineering in an SDN world. Today’s post begins to examine this certification by looking at the first of the two required exams: the 600-504 NPENG exam. We’ll look at both the exam and a related video course.
Other posts in this series:
Overview
First, to set the stage, Cisco currently offers four network programmability certifications. Loosely you can think of these as two networking-focused certs, and two development-focused certs, based on job roles. For the two networking-focused certs, one focuses on design, while one (the one discussed here) looks at engineering and implementation.
Figure 1: Overview of Cisco SDN Certifications
Today’s post focuses on the cisco network programmability engineering specialist (CNPES) cert, and specifically the first exam: the 600-504 NPENG exam. Basically, the NPENG exam covers SDN implementation but excludes ACI, while the second required exam, 600-512 NPENGACI, includes ACI.
This list provides the links for more details – for the certification, each of the two exams, and each of Cisco’s two Continue reading
MPLS VPN and DMVPN Design Challenge
MPLS VPN is used mostly as primary connectivity and DMVPN as a backup in the small medium business. You might see in some cases DMVPN is the only the circuit between remote offices and the datacenter/HQ, or for some applications MPLS VPN might be the primary,DMVPN for the others. As an example high throughput, high… Read More »
The post MPLS VPN and DMVPN Design Challenge appeared first on Network Design and Architecture.
Using Python’s Virtual Environments with Git For More Than Coding
Most think of python virtualenv as a way to create isolated development environments within a single PC, Laptop, Server, whatever their choice is. This is true, it’s what virtualenv was created...[[ Summary content only, you can read everything now, just visit the site for full story ]]
Using Python’s Virtual Environments with Git For More Than Coding
Most think of python virtualenv as a way to create isolated development environments within a single PC, Laptop, Server, whatever their choice is. This is true, it’s what virtualenv was created for...[[ Summary content only, you can read everything now, just visit the site for full story ]]
Using Python’s Virtual Environments with Git For More Than Coding
Most think of python virtualenv as a way to create isolated development environments within a single PC, Laptop, Server, whatever their choice is. This is true, it’s what virtualenv was created for...[[ Summary content only, you can read everything now, just visit the site for full story ]]
Using Python’s Virtual Environments with Git For More Than Coding
Most think of python virtualenv as a way to create isolated development environments within a single PC, Laptop, Server, whatever their choice is. This is true, it’s what virtualenv was created for...[[ Summary content only, you can read everything now, just visit the site for full story ]]