Last week I posted a tweet about a Kubernetes networking puzzle. In this post, we’ll go over the details of this puzzle and uncover the true cause and motive of the misbehaving ingress.
Imagine you have a Kubernetes cluster with three namespaces, each with its own namespace-scoped ingress controller. You’ve created an ingress in each namespace that exposes a simple web application. You’ve checked one of them, made sure it works and moved on to other things. However some time later, you get reports that the web app is unavailable. You go to check it again and indeed, the page is not responding, although nothing has changed in the cluster. In fact, you realise that the problem is intermittent - one minute you can access the page, and on the next refresh it’s gone. To make things worse, you realise that similar issues affect the other two ingresses.
If you feel like you’re capable of solving it on your own, feel free to follow the steps in the walkthrough, otherwise, continue on reading. In either case, make sure you’ve setup a local test environment so that it’s easier to follow along:
Clone the ingress-puzzle repo:
git clone Continue readingMONTRÉAL, June 11, 2020 /CNW Telbec/ – Bell today announced the launch of Canada’s...
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Today's Heavy Networking podcast focuses on a real-world SD-WAN deployment with OneOncology. The organization deployed an SD-WAN solution from Silver Peak, our sponsor for today's podcast, to securely segment and prioritize electronic medical records over other WAN traffic, get better service quality for critical voice and video applications, and ensure the WAN was highly available. Our guests are Robert Holloway, Infrastructure Manager at OneOncology; and Damon Ennis, SVP of Products at Silver Peak.
The post Heavy Networking 523: OneOncology Boosts WAN Security, Availability With Silver Peak Unity EdgeConnect SD-WAN (Sponsored) appeared first on Packet Pushers.
Plus, AMD’s second-generation EPYC processors are available on Amazon's Elastic Compute Cloud.
Of all the sessions from DockerCon LIVE 2020, the Best Practices + How To’s track sessions received the most live views and on-demand views. Not only were these sessions highly viewed, they were also highly rated. We thought this would be the case based on the fact that many developers are learning Docker for this first time as application containerization is experiencing broad adoption within IT shops. In the recently released 2020 Stack Overflow Developer Survey Docker ranked as the #1 most wanted platform. The data is clear…developers love Docker!
This post begins our series of blog articles focusing on the key developer content that we are curating from DockerCon. What better place to start than with the fundamentals. Developers are looking for the best content by the top experts to get started with Docker. These are the top sessions from the Best Practices + How To’s track.
How to Get Started with Docker
Peter McKee – Docker
Peter’s session was the top session based on views across all of the tracks. He does an excellent job focusing on the fundamentals of containers and how to go from code to cloud. This session covers getting Docker installed, writing Continue reading
The coronavirus pandemic has obviously had an impact on spending trends in the IT market. …
HPE Further Blurs The Storage Line Between On Premises And The Cloud was written by Jeffrey Burt at The Next Platform.
One of the things I picked up during the quarantine is a new-found interest in cooking. I’ve been spending more time researching recipes and trying to understand how my previous efforts to be a four-star chef have fallen flat. Thankfully, practice does indeed make perfect. I’m slowly getting better , which is to say that my family will actually eat my cooking now instead of just deciding that pizza for the fourth night in a row is a good choice.
One of the things I learned as I went on was about salt. Sodium Chloride is a magical substance. Someone once told me that if you taste a dish and you know it needs something but you’re not quite sure what that something is, the answer is probably salt. It does a lot to tie flavors together. But it’s also a fickle substance. It has the power to make or break a dish in very small amounts. It can be the difference between perfection and disaster. As it turns out, it’s a lot like security too.
Security and salt are alike in the first way because you need the right amount to make things work. Continue reading
Moving its eponymous NoSQL document database to the cloud and running it as a managed service has been a watershed event for MongoDB, which like a number of its peers in the broader database market are growing at the expense of relational databases that can’t scale as well for certain workloads. …
The Ever-Embiggening Humongous Document Database was written by Timothy Prickett Morgan at The Next Platform.
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Linux is becoming more and more prominent in the networking industry. Many of us come from a mixed background and have varying levels of knowledge of Linux. I’ve been around Linux for a long time but really never got beyond the very most basic stuff. Looking back, I wish I had spent some more time learning Sed, Awk, regex, and Bash etc. I was doing some labs over at NRE Labs (great labs), and wanted to highlight some of the things I learned.
Sometimes you want to append something quickly to a file or send several lines of text to a Linux command. That can be done using “here documents“.
First, look at this small configuration:
daniel@devasc:~/DevAsc$ cat config.txt interface GigabitEthernet0/1 switchport mode access switchport access vlan 10 ! interface GigabitEthernet0/2 switchport mode access switchport access vlan 10 ! interface GigabitEthernet0/3 switchport mode access switchport access vlan 10 !
Now we want to append another interface to the end of this file. We can do that using cat:
daniel@devasc:~/DevAsc$ cat <<EOT >> config.txt > interface GigabitEthernet0/4 > switchport mode access > switchport access vlan 10 > ! > EOT
After the cat command, Continue reading
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