tomleb's blog

Sending emails on Proxmox via CLI

Tue, 31 Dec 2024 00:00:00 +0000

I want to be able to send emails from my Proxmox node to notify me when my UPS is on battery.

If you already have an SMTP notification target set as the default notification mechanism, you can go straight to Sending an email.

On-demand Ollama in the homelab

Sun, 05 May 2024 00:00:00 +0000

Here’s how I achieve on-demand Ollama in my homelab without increasing my electricity bill through the roof.

High-level overview

The core of the solution lies in configuring a reverse proxy to handle requests to Ollama. If Ollama is not reachable, a special handler kicks in, forwarding the request to ollama-wake-on-lan - referred to as WoL service in the rest of this post.

Linux network namespaces and HTTP requests in Go

Wed, 02 Mar 2022 00:00:00 +0000

I recently needed to use net/http to make HTTP requests, but within a network namespace. Unfortunately, I couldn’t find examples for this and making it work involved a bit more than just calling netns.Set(namespace).

Go scheduler and preemption

Thu, 07 Oct 2021 00:00:00 +0000

I recently started doing a deep dive into the go internals, more specifically the scheduler. One of the first thing I came across is that go uses a cooperative work-stealing scheduler.

Filtering emails with sieve scripts and SourceHut

Sat, 31 Oct 2020 00:00:00 +0000

One of the annoyances I have had with emails has been filtering and managing messages. This usually rely either on email clients’ or the email provider’s filtering feature. Both have their pros and cons, but both are usually extremely limited. This is where sieve filters come in. We will go over how I use sieve to filter my messages, and how I configure and deploy my filter with SourceHut’s CI.

Socket creation in SerenityOS

Tue, 02 Jun 2020 00:00:00 +0000

I have been interested in SerenityOS, a graphical Unix-like operating system developed by Andreas Kling.

This blog post will dive in the internals of SerenityOS to look at the network stack and how a listening socket works. There will be a bit of assembly as well as c++.

First Steps with Buildroot

Mon, 04 May 2020 00:00:00 +0000

I am currently working on a personal project which involves building a Linux embedded system on the Raspberry Pi (and eventually other SoC). To build the Linux system, I decided to use buildroot, a “simple, efficient and easy-to-use tool to generate embedded Linux systems through cross-compilation”.

Symbols and Symbols File

Thu, 13 Feb 2020 00:00:00 +0000

Exploring the wlroots project, I came across the file wlroots.syms which has an extension I had not seen before in C projects. This file is a version script and it is used by the linker to determine what will be exported by a dynamic library.

Fast JSON Parsing with C and SIMD - 2

Fri, 03 Jan 2020 00:00:00 +0000

This is part 2 of the series that goes over the paper Parsing Gigabytes of JSON per Second by Geoff Langdale and Daniel Lemire.

The paper presents a very fast JSON parser and the techniques used to obtain high speed on a single core. The reference implementation simdjson is open source and is being developed on Github.

Fast JSON Parsing with C and SIMD - 1

Wed, 01 Jan 2020 00:00:00 +0000

This is a series that goes over the paper Parsing Gigabytes of JSON per Second by Geoff Langdale and Daniel Lemire.

The paper presents a very fast JSON parser and the techniques used to obtain high speed on a single core. The reference implementation simdjson is open source and is being developed on Github.