Rodrigo Vieira

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Rodrigo Vieira

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Founder at OperacionalTI, Linux SysAdmin, AWS Specialist, and Python developer (also have military training, just in case).

Linux Foundation Certified Sysadmin

I just received my grade of LFCS exam: 91%.I'm now a Linux Foundation Certified System Administrator.I would like to thank you Linux Academy for their awesome training platform that helped me to get prepared for this exam.

Interfaces and Abstract Classes

For most people I've talked on my journey through software development, abstraction always brings the idea of code reuse. You might think about company and person objects, both have names, addresses, phone contacts, and so on. They both share common ...

Why encapsulate?

I'm pretty sure you can find enough material about encapsulation in the context of Object Oriented programming paradigm on the Internet. Thus, my approach here is to expose a simple PHP snippet for those are not used to encapsulation yet. Let's say y...

Access Control List - ACLs

To improve the well known Linux permission schema ugo/rwx, allowing us to set distinct permission for different individual users or groups we can leverage the Access Control List - ACL. Requirements The filesystem where the files you want to set ACL ...

SELinux and AppArmor

They both are security related technologies classified as MAC - Mandatory Access Control. SELinux was created by NSA - National Security Agency, while AppArmor become popular after it has adopted by Ubuntu Linux. The main idea here is to create mecha...

Docker Development Environment for PHP Apps

In this article, I will do a pragmatic approach about how to run a generic PHP application on three Docker containers: nginx, php-fpm, and mysql. Motivation I want to run my PHP application on a standardized environment, on any computer, with the min...