lucavallin

Author here. The main idea is to treat instructions as context and put anything you actually need guaranteed into tests, lint and CI. The other part is pruning. Claude Code keeps usage counters in ~/.claude.json, and most of what I had installed had never run. Happy to answer questions.

A comprehensive but quick walkthrough of everything you need to know about GCP networking: VPCs, subnets, routing, firewalls, Shared VPC, GKE networking, load balancing, Cloud NAT, hybrid connectivity, VPC Service Controls, DNS, packet inspection, and how to operate all of it. Written for engineers who need a solid mental model in 15 minutes.

Hello! This is a practical write-up based on notes from docs, blog posts, and Liz Rice’s Container Security. I pulled together the main ideas that helped me better understand how container security actually works, and a bunch of simple things you can do to make containers safer in practice.

I published a new blog post: "A Tour of eBPF in the Linux Kernel: Observability, Security and Networking". I recently read the book "Learning eBPF" by Liz Rice and condensed my notes into this article. Great for a quick overview before you decide to dive deeper!

A Practical tour of eBPF in the Linux Kernel: Observability, Security and Networking.

eBPF lets you run small, verified programs inside the Linux kernel, enabling fast observability, security, and networking without changing application code. This practical tour explains why eBPF matters now, how programs are compiled, verified, JITed, and attached to events, and how maps and ring buffers move data. You'll leave with simple demos and a clear mental model to start experimenting.

I tried to write an end-to-end guide on Kubernetes networking, covering the full journey from the foundational Linux stack and CNI up to advanced topics like mTLS and service meshes. It's a long-ish read, but aims to be a good "intro" resource. Feedback is welcome!

I recently took a deep dive into the Linux kernel to understand how it handles processes, scheduling, memory, and more. While I had some OS knowledge from school, it always felt too abstract - so I wanted to see how things actually work. This post covers what I learned, from system calls to interrupts, and how kernel development differs from userspace.

In this post, I'll walk through OpenTelemtry core concepts and how to integrate OpenTelemetry in a Go application. By the end, you'll have a reusable telemetry package that sets up logging, metrics, and tracing! I've also published the package, complete with tests and examples, on GitHub: https://github.com/lucavallin/gotel . Feel free to use it as a starting point for your own projects.

After more than a decade of writing software, I've read lots of opinions on how to write good software. Everyone loves to throw around rules and principles, so I'll do it too.

I recently made a contribution to Istio, an open-source service mesh that simplifies managing microservices. In this post, I explain how Istio handles traffic routing, security with mTLS, and observability, making complex systems more resilient and efficient.

I recently made a contribution to Istio, an open-source service mesh that simplifies managing microservices. In this post, I explain how Istio handles traffic routing, security with mTLS, and observability, making complex systems more resilient and efficient.

I've been working with Terraform for a while now, and I've noticed that there are a few things that people keep asking me about. I thought it would be helpful to write a blog post about some of the most common questions I get asked and share some of the things I've learned along the way. This is not an exhaustive list, and, if you have any feedback or suggestions, please let me know!

Hi all! Since the setup to configure OIDC resources for GitHub Enterprise Server can be tricky, I've created a Terraform configuration that makes it easier to get started. The article describes the process for AWS, Azure and GCP and provides documentation for the repository.

Checkout the Terraform configuration I used to setup cloud resources on Azure, AWS and Google Cloud to enable OIDC-based auth for Actions on GitHub Enterprise Server.

Great for learning and for resume-building! I am not sure why it is at the top of the list, I don't think those are ordered in any specific way.

It used to be firstissue.dev, which sounds like everything else. It had to be verto.dev, but someone else took the domain. Verto is a word of significance in my native language, and one dear to me at that.

Some yellow for fun ;)

Glad to hear!

The goal is also to contribute to a project that you'd be proud contributing to. For example, my cousin's Twitter clone is easy to contribute to, but it has no effect on your resume.

Happy to hear! It's a short list made lengthy because of different providers, the details are in the readme: https://github.com/lucavallin/verto/tree/main#adding-a-new-p...

It doesn't meet the requirements!

That's what you get when you make changes late night / early morning!

Thanks!

Glad you like it!

verto.sh simplifies your entry into the open-source world by curating accessible projects. Ideal for beginners making their first contribution, founders building teams, and maintainers seeking new contributors.

I recently looked into how databases keep and find data, especially focusing on B-trees. In my new blog post, I've explained these ideas in a simple way. It's really interesting to see how these systems work to make our databases run smoothly. I'm keen to know what you think and learn more from any extra knowledge you might have on this!

Dive into the Go open source ecosystem with this tool that lists projects with beginner-friendly issues. It's a useful resource for those looking to contribute and learn in a practical environment. This platform offers a straightforward way for developers to get involved and incrementally improve their coding skills while connecting with other people.

Thanks for sharing!