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From 30 to 230 Docker containers per host
I could not find much information on the interwebs how many containers you can run per host. So here are mine and the issues we ran into along the way.
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Linux Observability with BPF
Why BPF and XDP are something you should learn.
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Logs were our lifeblood, now they're our liability
What happens when we collect too much data?
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Microsoft Screws Azure Customers and Its Own Advocates Alike
Microsoft’s recent licensing change for Windows Server is a great modern-day example of why so many businesses hated Microsoft two decades ago. Is this an aberration, or are they back to their old tricks?
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When AWS, Azure, or GCP Becomes the Competition
It starts with someone posting an AWS press release in the company chat. “AWS Announces FooBar,” the headline reads. The announcement skirts around technical details, as usual, but contains a worrying amount of buzzwords that overlap with the company’s product. Somebody responds with a grimace emoji 😬. Others reply…
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Why don't we have Wayland on Raspberry Pi yet? (2018)
I have long wanted to create my own desktop operating system targeting the Raspberry Pi. I believe we should have a hackable desktop environment that is both powerful and lightweight, similar to BeOS and the Amiga. To build this desktop we really need full control over how apps draw to the screen, but still have…
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A Cold Take on IBM, Red Hat and Their Hybrid Cloud
I start more blog posts than I finish, due to no shortage of other distractions and at times a near-crippling inability to blog short. When IBM announced they were acquiring Red Hat in October 2018…
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Working with GitHub Actions
GitHub Actions are still in beta and are changing quickly. But if you are looking to get started the possibilities are endless.
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Building a home NAS on a shoestring budget with the Rock64 SBC (2018)
I’ve gone through many iterations of a Home NAS over the years. It started with an AMD Phenom based system running in a Norco case with about 8 hard SATA hard drives (4 primary, 4 backup via Rsync). The noise and power consumption of that system was overkill for what it was used for, so I sold it and went to a…
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Stripped-down Kubernetes on the Raspberry Pi
Join me as I test-drive the smallest ever Kubernetes distribution k3s. Find out how this runs on Raspberry Pi compared to kubeadm with Docker.
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Use GitHub actions at your own risk
Malicious code can be inserted into any GitHub action, even those which are tagged.
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I forgot how to manage a server
Something embarrassing happened to me the other day. I was playing around with a new server on Digital Ocean and it occurred to me: I had no idea how to manage …
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How to Automatically Backup a Linux VPS to a Separate Cloud Storage Service
A walkthrough for backing up a Linux server to an external storage provider like Amazon S3 automatically.
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Goodbye Docker: Purging Is Such Sweet Sorrow
This was triggered by a recurring incident I faced where the Docker daemon was using 100% CPU on multiple cores that made the host effectively unusable.
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AWS Nitro System
At Tuesday Night Live with James Hamilton at the 2016 AWS re:Invent conference, I introduced the first Amazon Web Services custom silicon. The ASIC I showed formed the foundational core of our second generation custom network interface controllers and, even back in 2016, there was at least one of these ASICs going…
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Announcing Notqmail
Running my own email server has its challenges. Chief among them: my favorite mail-server software hasn’t been updated since I started using it in 1998.
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Mitigating a DDoS on Mastodon
<p>TLDR:</p> <!-- raw HTML omitted --> <p>This will mainly be a story into how I experienced and reacted to my first real-time attack. As you may or may not ...
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How to build a distributed throttling system with Nginx, Lua, and Redis
At the last Globo.com’s hackathon, Lucas Costa and I built a simple Lua library to provide a distributed rate measurement system that depends on Redis and run embedded in Nginx but before we …
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Full-system dynamic tracing on Linux using eBPF and bpftrace
How do you debug an application, library or an entire system with multiple processes? One answer: tracing. An introduction into bpftrace, and an overview of the Linux tracing ecosystem (DTrace, eBPF, uprobes, etc).
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Using Makefile(s) for Go
Using Makefile(s) for Go — Danish Prakash
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The Day “/Proc” Died
Solaris'd... This morning I got an email from our group manager asking about a UNIX server...
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OpenSSH taking minutes to become available, booting takes half an hour (2018)
So, your machine now needs minutes to boot before you can ssh in where it used to be seconds before the Debian Buster update?