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Managing database schema changes without downtime
How we manage schema changes at Discourse minimizing downtime
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OpenBSD on a Laptop
A guide to a secure and streamlined installation of OpenBSD 6.4 on a laptop.
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Is K8s Too Complicated? 
Joe Beda had a great twitter thread this morning about the complexity of Kubernetes. You can read it in full , and I suggest you do, but I wanted to quote a few things I found to be particularly thought provoking:
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Docker Considered Harmful (2016)
A note in advance: This is absolutely not about Docker being too "opinionated" for me, or other tools being more flexible. I believe that learning and using Docker is just plain more complicated than learning and using the tools I describe below. Docker is genuinely more complex and harder to use than the…
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The future of Kubernetes is virtual machines
Note: If this topic has peaked your interest, you can join me for a Webinar on August 15 where I’ll dive deep into Cloud Native Operations with Kubernetes and CI/CD Pipelines. Peering into the crystal ball Kubernetes as a technology has been very important to my career this year, and will be even more so for next year…
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An AWS Region is coming to South Africa
In the first half of 2020 we plan to launch an AWS Region in South Africa
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Massachusetts gas fires: Another technological tragedy
One Thursday afternoon last month, dozens of fires and explosions rocked three towns along the Merrimack River in Massachusetts. By the end of the day 131 buildings were damaged or destroyed, one person was killed, and more than 20 were injured. Suspicion focused immediately on the natural gas system. It looked like a…
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Go Is a Great Fit for Lambda
Why Go’s stability and simple deployments is a good fit for a serverless environment.
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Linux v4.15: Performance Goodies
With the Meltdown and Spectre fiascos , performance isn't a very hot topic at the moment. In fact, with Linux v4.15 released, it is one ...
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Stateful Experiments on AWS Lambda
In January 2017, we presented results to the European Commission on a FP7project called SyncFree, where we were tasked with a large-scale evaluationof the Lasp programming system. In this evaluatio...
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Free SSL on Github Pages with a custom domain: Part 2 – Let's Encrypt
GitHub Pages has just become even more awesome. Since yesterday1, GitHub Pages supports HTTPS for custom domains. And yes, it is still free!
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Free static websites with SSL for hackers
Note: GitLab Pages now fully integrate with Let’s Encrypt , making this post obsolete.
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Rainbow Deployments with Kubernetes
or: how you can deploy services to Kubernetes that require long periods of draining. #🌈 🌈 🌈 #If you want to jump directly to the technical solution, check out the project repo. Below is a short story about how we got to this solution.
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Walkthrough for Systemd Portable Services
Posts and writings by Lennart Poettering
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Docker for data scientists: Introduction and use cases
Data scientists looking to learn Docker can get a brief intro and a look at how to improve your workflow
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Extracting SSH Private Keys from Windows 10 ssh-agent
The newest Windows 10 update includes OpenSSH utilities, including ssh-agent. Here’s how to extract unencrypted saved private keys from the registry
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Anatomy of a Ceph meltdown
Last week, the server farm of our LMU Student Council had a major downtime over almost five days. As part of the administrator team there, I’d like to publish this post mortem to share our experiences and lessons learned to avoid situations like this in the future.
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AWS EC2 T2 Instances Demystified: Don’t Learn the Hard Way
How T2 burstable instances and CPU credits really work, with a worked example of a busy t2.micro running out of credits and grinding to a halt.
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OpenWrt in a WiFi card reader (2017)
The Zsun Wifi card reader is cheap tiny USB to MicroSD card reader with an integrated wifi chip running Linux, In a nutshell, it is a WiFi access point with more flash (16MB) and RAM (64 MB) than most OpenWrt supported routers. Polish hardware hacker q3k from Warsaw Hackerspace, is a recent and…
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