Kubernetes 101 – The constructs

In our last post, we got our base lab up and running.  In this post, I’d like to walk us through the four main constructs that Kubernetes uses.  Kubernetes defines these constructs through configuration files which can be either YAML or JSON.  Let’s walk through each construct so we can define it, show possible configurations, and lastly an example of how it works on our lab cluster.

Pods
Pods are the basic deployment unit in Kubernetes.  A pod consists of one or more containers.  Recall that Kubernetes is a container cluster management solution.  It concerns itself with workload placement not individual container placement.  Kubernetes defines a pod as a group of ‘closely related containers’.  Some people would go as far as saying a pod is a single application.  I’m hesitant of that definition since it it seems too broad.  I think what it really boils down to is grouping containers together that make sense.  From a network point of view, a pod has a single IP address.  Multiple containers that run in a pod all share that common network name space.  This also means that containers Continue reading

As Wi-Fi calls come to smartphones, networks get ready to carry them

Wi-Fi may carry many voice calls within the next few years, but the technology required to make those calls is still young in some ways.Mobile subscribers have been talking and doing video chats over Wi-Fi for a long time using Internet-based services such as Skype. Now carriers are offering ways to call up friends and family over wireless LANs using their regular phone numbers.Wi-Fi calling made a splash last year when the iPhone 6 came out with the capability, though a number of Android and other devices also have it. T-Mobile USA and Sprint both allow Wi-Fi calling with selected smartphones. AT&T and Verizon, as well as EE in the UK, plan to follow.To read this article in full or to leave a comment, please click here

Cisco ISLB Issue

Usually people are blogging on a certain topic because they want to share they knowledge with a certain protocol or product. Today I ll take another approach with that fact and I will actually do the exact opposite. I have an issue with ISLB which allows load balancing for my iSCSI sessions. Today I will elaborate […]

WLAN Capacity Planning: From Concept to Practice [Video]

Last week I presented at the Wireless LAN Professionals Conference (#WLPC) in Dallas, TX. The topic of my presentation was putting the concepts of WLAN capacity planning into practice.

Agenda:

  1. Factors of Network Performance (and why variable contention delay is critical to WLANs)
  2. Iterative WLAN Design Methodology
  3. Hands-On with the Revolution Wi-Fi Capacity Planner
  4. Real-World Example and Walkthrough (including tying capacity planning to RF planning)

The video is now available online:

 

If you would like a review of capacity planning concepts prior to watching the hands-on example, my presentation from last year's WLPC 2014 is also available online.


Cheers,
Andrew von Nagy

EIGRP Named Mode

Original content from Roger's CCIE Blog Tracking the journey towards getting the ultimate Cisco Certification. The Routing & Switching Lab Exam
EIGRP Named Mode or Multi-AF Mode is a new development in EIGRP starting in Version 15.x Its reason for being is to simplify the EIGRP configuration into one place, as previously with EIGRP classic version the configuration was between the interface and the global process which made it harder to see all the configuration relating... [Read More]

Other pages of interest:

Post taken from CCIE Blog

Original post EIGRP Named Mode

Check Cisco ASA Connections with Nagios

Night time trafficOnce you’ve setup your Cisco ASA, you will want to monitor it to ensure that it’s operating normally. The plugin nm_check_asa_connections for Nagios, and compatible products, can warn your if the number of current connections gets too high. A very high connection count might indicate that there’s an attack under way on one of your servers, you have some hosts on your inside which are part of a botnet and is attacking someone else, or perhaps you’re just about to grow out of your current firewall and need an upgrade to a more powerful box.

Continue reading

Show 223 – Viptela and the Software Defined WAN

As the industry adoption of SDN gains rapid traction, the Wide Area Network is emerging as the leading use-case (read 2015 is all about SD-WAN). Aging architectures make the WAN the dinosaurs of enterprise infrastructure. While WAN optimization can address a short-term capacity problem, the bigger problems of high circuit costs, network rigidity and poor […]

Author information

Greg Ferro

Greg Ferro is a Network Engineer/Architect, mostly focussed on Data Centre, Security Infrastructure, and recently Virtualization. He has over 20 years in IT, in wide range of employers working as a freelance consultant including Finance, Service Providers and Online Companies. He is CCIE#6920 and has a few ideas about the world, but not enough to really count.

He is a host on the Packet Pushers Podcast, blogger at EtherealMind.com and on Twitter @etherealmind and Google Plus.

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The post Show 223 – Viptela and the Software Defined WAN appeared first on Packet Pushers Podcast and was written by Greg Ferro.

Check Cisco ASA Connections with Nagios

Night time trafficOnce you’ve setup your Cisco ASA, you will want to monitor it to ensure that it’s operating normally. The plugin nm_check_asa_connections for Nagios, and compatible products, can warn your if the number of current connections gets too high. A very high connection count might indicate that there’s an attack under way on one of your servers, you have some hosts on your inside which are part of a botnet and is attacking someone else, or perhaps you’re just about to grow out of your current firewall and need an upgrade to a more powerful box.
Continue reading

Key questions to consider when evaluating hybrid cloud

This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.

Hybrid cloud is the talk of IT, but to avoid costly, labor-intensive megaprojects you cannot escape, pay particular attention to minimizing implementation and management complexity. These questions will help you identify the best hybrid cloud architecture for your environment:

1. What are the top ways we will use our hybrid cloud in the next 12 to 18 months? 

In the midmarket, the No. 1 answer is disaster recovery (DR). A secondary data center for DR is a luxury most companies can not afford. Now, public cloud services have put DR within reach of virtually all organizations. The key is to identify the enabling technology that minimizes complexity, maximizes automation and does not overtax the IT staff. Easy cloud DR solutions exist today for midsized shops; don’t be lead into a heavy professional services project.

To read this article in full or to leave a comment, please click here

Debunking the myths about scale-up architectures

This vendor-written tech primer has been edited by Network World to eliminate product promotion, but readers should note it will likely favor the submitter’s approach.

When growing capacity and power in the data center, the architectural trade-offs between server scale-up vs. scale-out continue to be debated. Both approaches are valid: scale-out adds multiple, smaller servers running in a distributed computing model, while scale-up adds fewer, more powerful servers that are capable of running larger workloads.

Today, much of the buzz is around scale-out architectures, which have been made popular by companies like Facebook and Google, because this architecture is commonly viewed as more cost-effective and “infinitely” scalable.

To read this article in full or to leave a comment, please click here

Networking Field Day 9 Is Almost Here!

Networking Field Day Logo

Confession: I fly out to San Jose, CA for Networking Field Day 9 tomorrow morning and I have yet to pack a single thing.

This last minute preparation thing seems to have become a habit. I’d like to tell you that it’s because I’m a seasoned traveller and I can calmly pack for a two week vacation in under 15 minutes, but really it’s just procrastination. It’s not even that I dislike travel; I quite enjoy going places and I definitely enjoy Networking Field Day so I know there’s something amazing waiting for me when I get there. I conclude then that my lackadaisical approach to travel packing is laziness in its purest form.

Networking Field Day 9

Any idea of being lazy at NFD9 though is laughable. As ever, we have a packed schedule meeting some really interesting vendors. There are some old faces and some new ones both in the attendees and the vendors!

Wednesday 10th February

  • VeloCloud – “Cloud-Delivered Software Defined WAN”. If they give prizes for buzz-word density, VeloCloud just won. The only thing missing is “as a Service”. Humor aside, VeloCloud seem to have an interesting product; it sounds almost like Cisco Continue reading

Get Started with CloudFlare ServerShield for Plesk

alt ServerShield makes it easy to activate CloudFlare and StopTheHacker.

CloudFlare has partnered with Parallels, the leading hosting solutions provider, to make server protection, content acceleration and malware removal easier than ever. We recently launched CloudFlare ServerShield® to all Plesk 12 users as an extension. ServerShield combines the performance and security features of CloudFlare with the malware scanning and removal solution of StopTheHacker. Whether you are a hosting provider looking to offer additional services to your customers, or a Plesk server user, you can access ServerShield with two easy clicks.

Already, a number of hosters and agencies have found ServerShield a key addition to their tools to help their customer sites’ security and performance. Rafal Kukla of Kukla Studio, a UK based design agency, has this to say:

“ServerShield made it straightforward to give my customers industry leading security and performance as well as reputation monitoring. Running a busy agency, I am focused on my customers' site design, ServerShield allows me to do that without sacrificing the fundamentals of site functionality. With one single click I can enable CloudFlare among all my customers instead of spending time configuring each site separately.”

We believe that this extension is incredibly timely Continue reading

AnsibleFest London Presentations

AnsibleFest_(1)-1

We had our biggest and best AnsibleFest last week in London! This was our 1st Ansible event outside of the United States and due to the amazing turnout and great crowd we will definitely include at least one stop overseas in 2016.

If you were not able to attend, or just wanted to see the presentations, we’ve compiled all of them here:

How to automate Big Data with Ansible - Marius Boeru, BigStep

Ansible and Vagrant - Sebastian Göttschkes, wogibtswas.at

The Devs Are Opsing (And It Isn’t Painful) - Ali Asad Lotia, Blue Newt

Ansible, Windows, and Powershell - Jon Hawkesworth, M Modal

How Rackspace Is Deploying OpenStack With Ansible - Walter Bentley, Rackspace

What's New in V2 - James Cammarata, Ansible

Ansible Internals - Brian Coca, Ansible


We’ll be announcing the next stop in the AnsibleFest tour soon (hint: It is New York City) so follow us on Twitter to find out all of the details first!

View our Ansible Tower Video here to learn all about the great features available in Ansible Tower.

Let’s Meet in Zurich or Heidelberg

I’ll be speaking at two conferences in March: SDN event in Zurich organized by fantastic Gabi Gerber, and the best boutique security conference – Troopers 15 in Heidelberg. If you’ll be attending one of these events, just grab me, drag me to the nearest coffee table, and throw some interesting questions my way ;) … and if you happen to be near one of these locations, let me know and we might figure out how to meet somewhere.

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