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Building dynamically-linked binaries in distroless images

SQLite3/Golang use-case example

May 14, 2024 - 3 mins read

Case I’ve been developing an application in Go that uses SQLite as a local cache of the backend. The story would end there if it wasn’t that I decided to go for a distroless image for opmitization purposes, and also, why not? The thing here is that for enabling certain features of the database/sql driver, the artifact should be dynamically linked through CGO_ENABLED=1 and with the -tags "fts5" (for the FTS5 feature support, see this issue comment).

Using parallel with multiple arguments

Passing multiple arguments in JSON to parallel

April 1, 2024 - 5 mins read

Series: Bash

A handy tool for parallelization If you are reading this post, is because you have heard about parallel. It is a GNU developed tool for paralelizing commands across sets of arguments. I’ll be honest, I use to forget about its existence until I need to do quick and dirty things when dealing with tasks that require paralelization, and whenever time is a constraint. It has plenty of options and arguments, although once you get up on its usage, it is very handy in many cases.

Ergodox Keyboard Layout for Colemak, QWERTY and Dvorak

The case of ortholinear keyboard solutions

January 24, 2024 - 5 mins read

Series: Typing

ℹ️ This is my current MacOS Layout. A few months ago, I bought the Ergodox OrthoLinear Split Keyboard. After a period of trying it, I’ve found that the QWERTY layout was considerably uncomfortable to type in the keyboard disposition. I wasn’t the only one, of course, so I started the journey for searching a suitable layout. During a period of time, I switched back and forth between three layouts (QWERTY, Dvorak, and Colemak), although I picked Colemak at the end.

[Useless Code] Swapping variable values with no additional libraries

Like, you want to make your life harder

February 23, 2023 - 1 min read

Background There was a contest in an internet thread about how to code a variable swap as low-level and minimal as possible. So, I ended up writing a low-level function in C calling instructions for a modern amd64 platform. #include <stdio.h> #include <stdlib.h> void swapshit(int *arg1, int *arg2) { __asm__ __volatile__ ("movl %2, %%eax;" "movl %3, %%ebx;" "movl %%eax, %0;" "movl %%ebx, %1;" : "=g" (*arg2) , "=g" (*arg1) : "a" (*arg1), "b" (*arg2) ); } int main(int argc, char *argv[]) { int arg1 = atoi(argv[1]); int arg2 = atoi(argv[2]); swapshit(&arg1,&arg2); printf("arg1 es %d , arg2 es %d\n",arg1,arg2); return 0; } The explanation of the above is quite simple.

Switching layout and key disposition experience

Leaving QWERTY behind

December 12, 2022 - 7 mins read

Series: Typing

This post has no intention to discuss what layout might be better in terms of efficiency or effort. There are a considerable amount of great articles related to all the analisys across different layouts, and even tools for ingesting text and estimate the effort of typing the text for several layouts. You’ll find this article more useful if you already decided to switch to Colemak, and make it your primary layout.

Google Cloud TCP Internal Load Balancing with HTTP Health Checks in Terraform for stateful services

Mixing protocols for getting TCP network balancers with HTTP health checks.

June 19, 2019 - 8 mins read

Series: GCP

Components and HCL code snippets to plug in iLB with your stateful services through HTTP API and TCP protocol.

Clickhouse sampling on MergeTree engine.

How MergeTree works using sampling feature

July 1, 2017 - 6 mins read

Clickhouse

Series: Clickhouse

Why sampling is important and what you need to be aware of? When dealing with very large amount of data, you probably want to run your queries only for a smaller dataset in your current tables. Specially if your dataset is not fitting in RAM. MergeTree is the first and more advanced engine on Clickhouse that you want to try. It supports indexing by Primary Key and it is mandatory to have a column of Date type (used for automatic partitioning).