What are Kubernetes Endpoint Slices? Why do they exist? How are they implemented?
Endpoint Slices are a Kubernetes API resource introduced to provide a scalable and extensible way to represent network endpoints in a Kubernetes cluster. The...
All posts
2023
Which Linux distribution should I choose?
Choosing a Linux distribution is often influenced by the specific use-case, individual preference, the system’s hardware, and sometimes prior experience with...
30-Day Series - Learn Helm
Week 1: Introduction and Basics. Week 2: Charting and Releases. Week 3: Customizing Charts and Security. Week 4: Repositories and Plugins
30-Day Series - Learn Kustomize
Week 1: Introduction to Kustomize and YAML. Week 2: Understanding and Setting Up Kustomize. Week 3: Hands-on Practice and Advanced Topics. Week 4: Review and...
How to build a Helm template
Helm templates are text files that Helm combines with a set of values to produce Kubernetes manifest files. They are written in the Go template language, wit...
What are Event-Driven Microservices?
Event-driven microservices are a form of software architecture where the microservices within a system communicate with each other through events. This desig...
Identify CPU/memory intensive processes and kill processes in Linux?
To identify CPU/Memory intensive processes in Linux, you can use the top command, ps command or the htop command, which is an enhanced version of top.
Interrupt the boot process in order to gain access to a system in Linux
The ability to interrupt the boot process to gain access to a system is a valuable skill for system administrators in several scenarios. These are some use-c...
Helm vs Kustomize
Helm and Kustomize are both tools for managing Kubernetes configurations, but they approach the task in significantly different ways. Here’s how they are dif...
What problems does Kustomize solve?
Kustomize is an open-source tool developed to manage complex Kubernetes configurations in a declarative way. It was designed to meet the need for a template-...
What problems does Helm solve?
Helm is a package manager for Kubernetes, which is an open-source platform for automating the deployment, scaling, and management of containerized applicatio...
In how many ways can I expose Kubernetes workloads?
There are several ways to expose Kubernetes workloads. Some of the most common methods are…
Do all software products follow a release cycle? What other approaches are there?
While many software products do follow a release cycle, it is not a hard and fast rule that all must do so. The nature of the software, the development metho...
Boot systems into different targets manually
Booting a Linux system into a different target (also known as runlevel in older versions of Linux) can be achieved by using the systemd utility. This is a sy...
Basic input-output redirection in Linux
Output redirections send output streams of a process to a file while input redirections send the content of a given file to the input stream of a process. Se...
A primer on file permissions in Linux
Understanding and manipulating file and directory permissions is a crucial aspect of Linux system administration. The letters u, g, o stand for User, Group, ...
What, why, how is eval command in shell?
eval is a built-in command in most Unix-like operating systems, such as Linux. It comes from the sh (Bourne shell) programming language, which was one of the...
What are inodes?
In Linux, an inode, aka index node, is a data structure that stores information about a file or directory. It contains metadata about the file, such as its s...
Why does GitOps not use pipelines?
GitOps is a way to manage and apply changes to infrastructure and applications based on the Git version control system. The primary reason that GitOps doesn’...
30-Day Series - Learn Python
Python is an ubiquitous language used in software development. It is a high-level, interpreted, and general-purpose programming language. It was created by G...
Do I need a private Docker images Registry?
Whether you should have a Docker registry or not depends on your specific use case and requirements. Let’s understand the differences and purposes of both Do...
30-Day Series - Learn Kafka
Week 1: Introduction and Basics. Week 2: Charting and Releases. Week 3: Customizing Charts and Security. Week 4: Repositories and Plugins
2022
How to automate the configuration of your homelab servers?
A goal I always have in mind is to automate as much as possible what I do. That’s the case for sure on my homelab and I have no problem erring on the overkil...
What are the basic tasks a Linux Sysadmin should do on her homelab?
One of the things I want to work on is my Linux Sysadmin skills. Linux supports much of cloud native ecosystem, namely Kubernetes. It is helpful to have a ce...
Are all applications with a database stateful?
For some time this got me confused. There is much to be said about the advantages of stateless applications. Availability and resilience are much easier to a...
30-Day Series - Databases
In the context of computing, a database is an organized collection of data that can be easily accessed, managed, and updated. Databases are used to hold info...
What is AWS Control Tower?
The official website introduces AWS Control Tower in the following way: AWS Control Tower provides the easiest way to set up and govern a secure, multi-accou...
What is Red Hat OpenShift?
OpenShift is a Red Hat product that builds a façade on top of Kubernetes. It takes an opinionated approach to Kubernetes with the goal of reducing the time t...
A step-by-step ArgoCD demo for beginners (PART 2)
This is the continuation of part 1 of this series.
Should I sit the AWS Certified DevOps Engineer Professional Exam?
I am currently thinking about whether it would be interesting to sit this exam. DevOps is a topic dear to me. As for AWS, it’s a provider I am quite familiar...
A step-by-step ArgoCD demo for beginners (PART 1)
ArgoCD is a declarative GitOps continuous delivery tool built to deploy applications to Kubernetes. The goal of this demo is to install ArgoCD in a Kubernete...
What are Non-Functional Requirements? A brief explanation
I like to think of Non-Functional Requirements (NFR) as system-wide requirements. Since they are not attached to a specific behaviour or function (that’s whe...
How I backup my personal files
A topic I struggled with for many years was how to back up my personal files. This took place before knowing about the wonders of version control. In those d...
What is the difference between API Gateway and Load Balancer?
In the previous post, I clarified the difference between an API Gateway and a Service Mesh. However, another common question is the difference between an API...
What is the difference between API Gateway and Service Mesh?
Both terms are common in the development of Cloud Native applications. They both deal with inter-application communication but they are not the same.
How do Splunk and ELK compare?
Splunk and ELK are log management and analysis tools commonly used by enterprises. Here is a list of a few differences and similarities.
60-Day Series - Stateful Apps in Kubernetes
Kubernetes is an orchestration platform that has become a standard for deploying and managing containerized applications, including both stateless and statef...