A Tale of Two Cities is a novel by Charles Dickens published in the mid-19th century. Its central theme is duality, which is depicted in the first paragraph of the novel: "It was the best of times, it was the worst of times, it was the age of wisdom, it…

Ok, I have listened to Test Pyramid, indeed, there is plenty of content around this concept. Roughly, the test pyramid concept asserts that the first layer of test, Unit, is cheaper, faster, and has the desired confidence property [1,2,3]. As we climb the pyramid through Integrated and End2End (E2E) tests…

Let us start recalling the conclusion of the last conversation [1]. IT phenomena as cloud, “…-as-a-service”, and microservices, which carry on distributed computing, require reliability engineering since the complexity of systems continues to grow. …

Of course, you have heard about Site Reliability Engineering (SRE), an acronym introduced by Google. The aim of this text is to dissect the acronym using a seesaw (an old-school kindergarten toy) as a conceptual model. Nonetheless, instead of going from kindergarten to middle school, as usual, this text applies…

A didactical way to define a concept is starting by what it is not. Therefore, in Section 1, the focus is on what is not an “architecture for agility”. In Section 2, a case, inspired by a true story, is discussed to clarify what we would call an “architecture for…

Once upon a time, a queen possessed a magic mirror, which she asked every morning, “Magic mirror on the wall, who is the fairest one of all?” The mirror always told the queen that she was the fairest. One day, when the queen asked her mirror, it told her that…

“Everyone makes mistakes. The wise are not people who never make mistakes, but those who forgive themselves and learn from their mistakes.” — Ajahn Brahm (theoretical physicist, author, and Buddhist monk) In this second part, we return to the endeavor of providing, perhaps, for wise people, a shortcut to “learn…

“Everyone makes mistakes. The wise are not people who never make mistakes, but those who forgive themselves and learn from their mistakes.” — Ajahn Brahm (theoretical physicist, author, and Buddhist monk) Nowadays, the microservice pattern [1] is a hot topic, which has a tremendous influence on all sorts of software…

Assume that is in place a tool for the management of containerized applications across multiple hosts (e.g., Kubernetes, OpenShift, Docker Swarm, Apache Mesos) and that applications are composed of containerized processes as defined by the Twelve-Factor App. Still according to the Twelve-Factor App [1], such containerized processes can be horizontally…