Using Serverless Framework with AWS SSO

 Posted on October 22, 2023  |  3 minutes  |  Sergio Guillen  • Also in: Español

In this post, I will present a solution (one I personally find quite tidy) to a problem I encountered with AWS SSO and the Serverless Framework. Serverless Framework is one of my favorite tools when I need to work with AWS Lambda and other serverless services, it is an alternative to AWS SAM, but personally, I prefer Serverless Framework due to its support for various cloud providers and plugins. Previously, I had used Serverless to access AWS API by configuring my ~/. [Read More]

Mocking EC2 metadata server locally

 Posted on May 28, 2023  |  4 minutes  |  Sergio Guillen  • Also in: Español

Some time ago I was working on creating a local docker-based development environment for some microservices at work so developers can have the necessary infra components on their machines and that will help them with their daily tasks. Initially, the business logic of some microservices were a black box to me. After containerizing the applications and creating the docker-compose setup, some of them started failing and after checking the logs it turns out that the applications were using AWS SDK to get ec2 instance metadata. [Read More]

What Happens When A Linux Process Goes To Sleep?

 Posted on March 10, 2022  |  15 minutes  |  Sergio Guillen  • Also in: Español

It is possible when you are writing code, at some point you might need to pause the execution of a process by calling the sleep(NUMBER_OF_SECONDS) function depending on the problem you are solving. In this post, I will share what I learned so far while investigating the internal kernel mechanisms that make the sleep function work the way it does. I appreciate your feedback. I am not an expert on this topic as Linux Kernel’s internals are new for me, it was just my curiosity that drove me to get into kernel’s source code, and wanted to share what I learned. [Read More]

Analyzing a Video Looking for Possible Malware

 Posted on November 26, 2019  |  16 minutes  |  Sergio Guillen  • Also in: Español

Hello, during the months of October and November different social and political conflicts occurred in Bolivia, this entry is not so much to discuss the political issue, it will be a 100% technical entry but it is related to those events. The previous week a large number of clients from a local ISP received an SMS with a link bit.ly to an MP4 video in Dropbox that was later deleted. [Read More]

Automating post-installation setup in my personal Debian machines

 Posted on May 13, 2019  |  5 minutes  |  Sergio Guillen  • Also in: Español

Hi, some time ago I posted about my initial setup in my Debian personal machines that use for work or personal projects. Some of the things I setup are: applications, desktop look and feel, etc. The last months I installed and re-installed my Debian machines so many times in different computers that I use (new computers, new hard drives, etc.) and this taks was repetitive. Basically what I was doing was to review my previous blog post and repeat those steps. [Read More]