Sensible integer scale for Gonum Plot

January 20, 2021

Over the years, I found myself multiple times using Gonum Plot. I do find it as a very good and easy to use plotting tool for Go. The problem I found myself, over and over, dealing with is the tickers scale. If you know before-hand the values that can be expected to be created by the application, it is very straightforward, but the majority of times, this is not the case.

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Red Hat Certified Engineer

December 28, 2020

At the beginning of this month, I took the EX294 exam, which allowed me to obtain the Red Hat Certified Engineer (RHCE) certification. It was the first time I attempted the RHCE exam, but I prepared myself in the past for the EX300 exam, the exam that allowed you to obtain the RHCE certification in the RHEL7 time, but never got around to do the exam. Compared to what I had to study for the EX300, I found the EX294 program way more sensible.

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Obtain previous Job ID in Ansible Tower Workflow

November 15, 2020

Ansible Tower allows you to create Workflows, which enable you to create complex workflows by putting together multiple Ansible Playbooks. Ansible Tower Workflows can have some simple logics, such as run different Ansible Playbooks based on the outcome (success or failure) of a previous Ansible Playbook run. Sometimes, though, you need to have more information about a previous Ansible Playbook run than just the outcome. I recently found myself in a situation where I had an Ansible Tower Workflow with two Ansible Playbooks into it, where the first one was performing specific tasks.

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Red Hat Certified System Administrator

October 1, 2020

A few years ago, I did pass this exam, but since then, the certification expired, so I had to re-take the exam. While the first time I did the exam in a testing center, this time I had to do it at home since all test centers are closed. The experience of doing the exam at home has been a very positive one since you can arrange the environment as it better fits you.

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On public TLS certificates lifetime

September 13, 2020

On September 1st, 2020, the maximum lifetime of TLS certificates signed by Public Certificate Authority got reduced to 13 months. How did we arrive here, and what’s to come? Let’s start from understanding who decides the maximum lifetime of certificates and many other limitations around them. Who decides the TLS certificate guidelines Ultimately, the client (often a browser or an operating system) identifies the certificate as trustable or not (based on the CA that signed it as well as many other parameters), so the client can decide which parameters to look for and which values are acceptable and which are not.

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KubeCon + CloudNativeCon Europe 2020

August 20, 2020

This year I managed to partecipate to KubeCon + CloudNativeCon Europe 2020. As you can imagine, the conference did not happen in real life, but it was converted to an online conference. More virtual conferences I attend to, more I understand the limits and the advantages of them compared to real conferences. In this particular conference, I realized that one of the biggest problems I have with virtual conferences is that, during the conference, the conference events and talks add to your usual events and meetings, making it impossible to follow all events you wanted to follow.

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Fedora Nest 2020

August 10, 2020

This year Flock did not happen due to COVID-19, and in its place, Fedora Nest happened. After many events I’ve seen going virtual in the last few months, I was skeptical. I was yet to see an acceptable online platform to run events. I was wrong on the platform. Fedora Nest used Hopin , which is by far the best platform for events I’ve seen so far. Don’t get your expectations too high, though, because when I say the best one I’ve seen so far, only means that it is usable, and it does not mean in any way that is on par of real conferences.

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A website with no cookies

July 19, 2020

Today I did a big update to this website. The goal of today’s update is the removal of Disqus. I have decided to remove Disqus more than a year ago, with the decision to remove all cookies from this website. The plan was to remove both Google Analytics and Disqus since those were the only two reasons this website was distributing cookies. I removed Google Analytics in June 2019, and now I’ve removed Disqus, so this goal has now been achieved.

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ARM everywhere

June 25, 2020

In the last couple of months, we have seen a lot of news around ARM. More specifically, the most relevant ones, in my opinion, are (sorted by date): On May 11, AWS announced the availability of new instance types (M6g, C6g, R6g) based on Graviton2 , a new version of their in-house developed ARM processor On June 17, Ampere announced a 128 core ARM processor that will be added to their current line (that includes 32, 48, 64, 72, 80 cores ARM CPUs) On June 22, was made public that Fugaku, an ARM-based supercomputer, is the most potent publicly disclosed supercomputer On June 22, Apple announced that Macs will move to ARM Those pieces of news demonstrate how much the processors’ landscape is changing, and how fast the rate of change is.

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Practical Ansible 2

Published on June 5, 2020
Authored by Daniel Oh, James Freeman, Fabio Alessandro Locati
Published by Packt Publishing Limited

Ansible enables you to automate software provisioning, configuration management, and application roll-outs, and can be used as a deployment and orchestration tool. While Ansible provides simple yet powerful features to automate multi-layer environments using agentless communication, it can also solve other critical IT challenges, such as ensuring continuous integration and continuous deployment (CI/CD) with zero downtime. In this book, you’ll work with Ansible 2.9 and learn to solve complex issues quickly with the help of task-oriented scenarios.

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