Bootstrapping an etcd Cluster with TLS using Kubeadm

The etcd distributed key-value store is an integral part of Kubernetes. I first wrote about etcd back in 2014 in this post, but haven’t really discussed it in any great detail since then. However, as part of my recent efforts to dive much deeper into Kubernetes, I needed to revisit etcd. In this post, I wanted to share how to boostrap a new etcd cluster with TLS certificates using kubeadm.

Before I go on, I feel compelled to state that this is certainly not the only way to bootstrap an etcd cluster with TLS certificates. I feel I must also state that nothing in what I’m about to share is new, novel, revolutionary, or unusual. In fact, a fair amount of it is based on these instructions, although this post will focus on using systemd unit files instead of static pods under Kubernetes. I’m simply documenting it here in the hopes of getting the information more broadly disseminated, and to help document my own journey of learning.

Preparing the Systems

Before you bootstrap the etcd cluster, you’ll first need to prepare the nodes for the process. Although I’ll list the steps manually below, in practice you’ll want to Continue reading

IDG Contributor Network: Don’t let yourself be erased from the business needs narrative

A CIO of a retail chain recently issued an edict that all requirements for networking must be stated as business needs, including all RFIs, RFQs and internal proposals. No networking protocols, features or terms are now permitted. At first glance this seems like a relatively simple instruction, but the IT staff struggled to articulate business needs and map them to network capabilities. The CIO is imposing a discipline of asking “why” three times to try to understand and separate the inertia of past choices from what their business needs today. I believe the CIO is wise in trying to connect the business needs to network capabilities.Speaking the language of the industry Networking professionals are being left out of the narrative. We are deemed a necessary evil rather than a partner in producing products and services. We are the people that slow things down, make things harder and budget for things people do not understand nor value. Becoming part of the narrative requires that each networking professional understand and anticipate their business’s needs. In fact, I would argue that the public cloud, bring your own device and shadow IT are the result of networking not being part of the narrative. Continue reading

IDG Contributor Network: Don’t let yourself be erased from the business needs narrative

A CIO of a retail chain recently issued an edict that all requirements for networking must be stated as business needs, including all RFIs, RFQs and internal proposals. No networking protocols, features or terms are now permitted. At first glance this seems like a relatively simple instruction, but the IT staff struggled to articulate business needs and map them to network capabilities. The CIO is imposing a discipline of asking “why” three times to try to understand and separate the inertia of past choices from what their business needs today. I believe the CIO is wise in trying to connect the business needs to network capabilities.Speaking the language of the industry Networking professionals are being left out of the narrative. We are deemed a necessary evil rather than a partner in producing products and services. We are the people that slow things down, make things harder and budget for things people do not understand nor value. Becoming part of the narrative requires that each networking professional understand and anticipate their business’s needs. In fact, I would argue that the public cloud, bring your own device and shadow IT are the result of networking not being part of the narrative. Continue reading

Rethinking Security in Cloud Networking

security-blog-2018

Every CXO worries about security because the perimeter is changing; in fact, there are no walls for protection. The lines between cloud, workloads, applications, enterprise networks and hosts are blurring and the challenges are getting exponentially greater. The true security architect must rapidly address the reality of a more holistic network-wide security strategy. It must be one that goes beyond the cyber threat of the day to address the risk, scale and mitigation of persistent security issues. The state of cyber security needs urgent resolution because:

Rethinking Security in Cloud Networking

security-blog-2018

Every CXO worries about security because the perimeter is changing; in fact, there are no walls for protection. The lines between cloud, workloads, applications, enterprise networks and hosts are blurring and the challenges are getting exponentially greater. The true security architect must rapidly address the reality of a more holistic network-wide security strategy. It must be one that goes beyond the cyber threat of the day to address the risk, scale and mitigation of persistent security issues. The state of cyber security needs urgent resolution because:

Pure Storage CEO on all-flash data centers and the cloud

One year ago Charlie Giancarlo took the helm of Pure Storage, which in fiscal year 2018 reported its first billion-dollar year.Giancarlo was a managing director and senior advisor at Silver Lake Partners before joining Pure Storage. Prior to that, he held multiple executive positions at Cisco, where he helped steer the company into markets such as Ethernet switching, VoIP, Wi-Fi and telepresence.[ Check out AI boosts data-center availability, efficiency. Also learn what hyperconvergence is and whether you’re ready for hyperconverged storage. For regularly scheduled insights sign up for Network World newsletters. ] Giancarlo talked with Network World's Ann Bednarz about what Pure is doing to keep the storage industry moving forward, and how the experience he gained during Cisco’s growth spurt is helping. To read this article in full, please click here

Pure Storage CEO on all-flash data centers and the cloud

One year ago Charlie Giancarlo took the helm of Pure Storage, which in fiscal year 2018 reported its first billion-dollar year.Giancarlo was a managing director and senior advisor at Silver Lake Partners before joining Pure Storage. Prior to that, he held multiple executive positions at Cisco, where he helped steer the company into markets such as Ethernet switching, VoIP, Wi-Fi and telepresence.[ Check out AI boosts data-center availability, efficiency. Also learn what hyperconvergence is and whether you’re ready for hyperconverged storage. For regularly scheduled insights sign up for Network World newsletters. ] Giancarlo talked with Network World's Ann Bednarz about what Pure is doing to keep the storage industry moving forward, and how the experience he gained during Cisco’s growth spurt is helping. To read this article in full, please click here

Upcoming Webinars and Events: Autumn 2018

The summer break is over, and we’ve already scheduled a half-dozen events and webinars in August and September:

We’ll run an event or webinar in almost every single week in September:

Read more ...

DNS privacy in new Android 9

I recently enrolled in the Android developer preview programme and got hold of the Android P (9 beta) OTA image for my Nokia 7 Plus phone, and while discovering what’s new, I found a new advanced option under network settings called ‘Private DNS’ that got my attention. This led to me finding an article from Erik Kline describing this new feature in Android 9, which to my surprise supports DNS-over-TLS (RFC 7858).

Last year we wrote about the experiments in the Go6lab with DNS-over-TLS where we set up a recursive DNS resolver listening on port 853 and serving DNS answers to queries encrypted with TLS. This setup was useful if your local DNS resolver was Unbound or Stubby, and since then I’ve been using Stubby as my local DNS client on MacOS with the Unbound DNS server at the Go6lab (privacydns.go6lab.si) as a recursive resolver for encrypted DNS queries without any issues.

So armed with the information from Erik, I decided to test out the Android implementation.

First thing was to turn on the setting and test it with the ‘privacydns.go6lab.si’ server which worked fine. Enabling ‘log-queries’ on the Unbound server quickly revealed that DNS queries are Continue reading

The Law of Snooping

There is a saying, attributed to Abraham Maslow, that when all you have is a hammer then everything looks like a nail. A variation is that when all you have is a hammer, then all you can do it hit things! For a legislative body, when all you can do is enact legislation, then that’s all you do! Even when it’s pretty clear that the underlying issues do not appear to be all that amenable to legislative measures, some legislatures will boldly step forward into the uncertain morass and legislate where wiser heads may have taken a more cautious and considered stance.

Workshop Epilogue 2

Networkers and Coding Q & A

In Part One of this blog I mentioned that I liked to start the second day of the workshop a little differently. The workshop itself was aimed very much at network engineers but the second day was all about using Python to interact with the ArubaOS-CX API. I know from experience that not everyone is comfortable with the notion of engineers diving into coding, that for many an API is just the latest ‘bright and shiny’ that will dull soon, and that network automation is just a marketing buzzword bubble. Regardless of all this, the exercises were all Python and the attendees were going to make API calls and pick through JSON. There was no exam, no compulsion to attend, no (ridiculous) participation certificate and no armed guards blocking the exits.

"Why are you here?"

With all this in mind I thought we might as well tackle the 'networker vs. dev' subject head on, so I put it to the attendees; "Today is about Python, you are network engineers, why are you here?" Rather than just have them listen to me provide my viewpoint, I wanted the group to interact and provide Continue reading

Definitive VMworld 2018 Guide for Micro-Segmentation Practitioners

As you plan to attend VMworld 2018 – Do you have questions like : how do I micro-segment? What grouping strategies do I use? How to do a Firewall-As-A-Service in hybrid VM and Container environments? Or you are a Pros and would like to know more of what is new? – We would like to help you answer and have the best possible help as you head back to your organizations. This blog captures the Micro-Segmentation sessions that are geared towards designing your micro-segmentation strategies. Meet with our experts go in details with you. Listen to our customers on their journeys and understand all the options that VMware can help you with this journey.

 

Monday: August 27, 2018

It starts at 11.30 am with:

Have lunch and then you have two choices:

OR

We’ve Added a New CCNA Security Course To Our Video Library

Security Concepts is an introductory security course, meant for those at the CCNA level. This 5 hour course is taught by Gabe Rivas and is a great prep course for those who are studying for the 210-260 IINS Exam.

About the Course

This course is the first of an 8 course CCNA Security Certification Curriculum.At INE, We believe that breaking the course up into smaller topics makes it easier to manage and digest your learning experience.

In this introductory course, we will walk you through basic security concepts that are meant to build a solid network security foundation and help you dive into more practical and advanced topics. We will start by helping you understand the meaning of Asset, Vulnerability, Threat, Risk, and Countermeasure terms. Then we will break down the CIA triad and show how it helps organizations develop sound security policies. We will also cover monitoring tools that assist in detecting events in real-time as well as cover concepts about common security zones. As we move forward, we will cover social engineering topics, network attacks, different kinds of malware found in today’s networks, data loss, cryptography and hashing, and finally we will go over common network topologies Continue reading

DeGrasse Tyson: Make Truth Great Again

Neil deGrasse Tyson tweets the following:
When people make comparisons with Orwell's "Ministry of Truth", he obtusely persists:
Given that Orwellian dystopias were the theme of this summer's DEF CON hacker conference, let's explore what's wrong with this idea.

Truth vs. "Truth"

I work in a corrupted industry, variously known as the "infosec" community or "cybersecurity" industry. It's a great example of how truth is corrupted into "Truth".

At a recent government policy meeting, I pointed out how vendors often downplay the risk of bugs (vulnerabilities that can be exploited by hackers). When vendors are notified of these bugs and release a patch to fix them, they often give a risk rating. These ratings are often too low, in order to protect the corporate reputation. The representative from Oracle claimed that they didn't do Continue reading

RDMA over Converged Ethernet (RoCE)

RDMA over Converged Ethernet is a network protocol that allows remote direct memory access (RDMA) over an Ethernet network. One of the benefits running RDMA over Ethernet is the visibility provided by standard sFlow instrumentation embedded in the commodity Ethernet switches used to build data center leaf and spine networks where RDMA is most prevalent.

The sFlow telemetry stream includes packet headers, sampled at line rate by the switch hardware. Hardware packet sampling allows the switch to monitor traffic at line rate on all ports, keeping up with the high speed data transfers associated with RoCE.

The diagram above shows the packet headers associated with RoCEv1 and RoCEv2 packets. Decoding the InfiniBand Global Routing Header (IB GRH) and InfiniBand Base Transport Header (IB BTH) allows an sFlow analyzer to report in detail on RoCE traffic.
The sFlow-RT real-time analytics engine recently added support for RoCE by decoding InfiniBand Global Routing and InfiniBand Base Transport fields. The screen capture of the sFlow-RT Flow-Trend application shows traffic associated with an RoCEv2 connection between two hosts, 10.10.2.22 and 10.10.2.52. The traffic consists of SEND and ACK messages exchanged as part of a reliable connection (RC Continue reading

Securing The Server, Inside And Out

Computing is hard enough, but the sophistication and proliferation of attacks on IT infrastructure, from the firewall moat surrounding the corporate network all the way down into the guts of the operating system kernel and deep into the speculative execution units on the physical processor, make the task of computing – with confidence – doubly difficult. …

Securing The Server, Inside And Out was written by Timothy Prickett Morgan at .

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