Alex Callejas

227 points

Mexico City

Alex Callejas is a Services Content Architect of Red Hat, based in Mexico City and an opensource.com contributor. With more than 20 years of experience as Sysadmin, he has strong expertise on infrastructure hardening and automation. Enthusiast of open source, supports the community sharing his knowledge in different events of public access and universities.

Geek by nature, Linux by choice, Fedora of course.

Open Minded Emerging Contributor Award 2019 Author Contributor Club

Authored Content

3 scary sysadmin stories

Terrifying ghosts are hanging around every data center, just waiting to haunt the unsuspecting sysadmin.

We don't make software for free, we make it for freedom

A sysadmin's handy cheat sheet for SELinux

Improve your skills managing and using Security-Enhanced Linux with this helpful guide.

A sysadmin's guide to SELinux: 42 answers to the big questions

Get answers to the big questions about life, the universe, and everything else about Security-Enhanced Linux.

Contributed Content

Why the operating system matters even more in 2017

7 pieces of Linux advice for beginners

We asked our community of writers for the best advice they got when they first started using Linux.

Authored Cheat Sheets and Downloads

Cheat sheet: SELinux

By Alex Callejas

SELinux may seem complex at first, but with the right cheat sheet it can become a powerful ally for sysadmins. This guide is designed to help you to improve your skills…

Authored Comments

dark_axl

11 Dec 2018

3 scary sysadmin stories

It's cool that you liked it! And above all, that you have identified with her, it is a very personal story, I also learned from very wise people and I did not have much time to surf the web, much less to annoy the young people.

On the contrary, it is a story about what we should not allow, stop learning and not share our knowledge.

In addition, it is a small tribute to a story by one of my favorite writers: Neil Gaiman in Troll Bridge.
Best regards,