Fabricio Jiménez Morales
DevOps Engineer · Physics PhD
Welcome! I work with Linux, Containers, Kubernetes and learn about Cloud-native technologies. I code with Python and am interested in solving problems with AI and Machine Learning. I used to work with big colliders like CERN’s LHC. Don’t hesitate to contact me for collaborations or work opportunities.
You docker run. You get containers with networking. It’s that simple. But is it? Under the hood, Docker creates network namespaces, virtual Ethernet devices, bridges, routing rules and everything else needed for containers to communicate. I’m following Drew Elliot’s Networking Course lessons; the first of which is mostly about how networking happens in containers. What follows is based on the notes I made during the course and revised on my own, including some concepts I wanted to revise. ...
Recently, I’ve learned about development in dev containers. This idea is great because it allows for siloed, reproducible, full-featured environments for development. Since DevOps is about enabling product work, dev containers are a great example of that. This idea can actually go further: dev containers can also be used for management, admin, and DevOps tasks, like Kubernetes cluster management. In that case, tools and configuration files are as important as application code. One can have a dedicated management environment for a single cluster, reducing the risk of accidentally targeting the wrong cluster. ...
Security is one (if not the) main priority of many Linux administrators, and now more than ever this is the case in the context of the large number of systems we typically manage today: containerized systems running in clusters, cloud microservices, ephemeral environments, and so on. We talk a lot about the essentials: good password, key and secrets management, firewall policies, encryption, and similar topics; which is obviously critical. But I also believe that threats can be mitigated through small habits, in the commands we do daily. ...
About a half a life ago, I had my first Linux lesson, and the best so far. I was a freshman at uni and started learning Linux at Laboratorio Docente de Computación. After a few weeks there, the first important homework was a seemingly simple one: create a new user (your user) in a Linux machine using the terminal. But there’s a catch (see what I’m doing here?): no adduser or useradd scripts allowed. I could bring my notes but not my laptop. ...