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Devops
Kubernetes Gateway API vs. Ingress Controllers: A 2025 Guide to Modernizing Service Networking and Traffic Routing
In the early days of Kubernetes, exposing services to the outside world was a binary choice: use a LoadBalancer (expensive and one-to-one) or use NodePort (clunky). Then came Ingress, a revolution that allowed us to consolidate routing rules behind a single entry point. Fast forward to 2025. While the Ingress resource served us well, modern cloud-native architectures have outgrown it.…
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Devops
Linux Performance Analysis 2.0: Transitioning from Legacy CLI Tools to eBPF for Deep System Observability
For decades, Linux systems administrators and SREs have relied on a trusty toolkit of command-line utilities. Commands like top, ps, iostat, and netstat are muscle memory for anyone who has ever needed to debug a slow server. However, as architectures shift toward microservices and containers, and as hardware becomes faster, these legacy tools are showing their age. They are often…
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Devops
GitOps with ArgoCD: Automated NGINX Deployment on Minikube
What is GitOps? In today’s software world, everyone is familiar with the term deployment. A deployment is the process of releasing a new version of your software application to production. Essentially, it’s your software delivery mechanism. Typically, this process follows these stages: Building → Testing → Staging → Deploy to Production, often triggered after a Pull Request (PR) is approved…
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Server
CentOS 7 Yum Issues and the Vault Repository Solution
CentOS 7 Yum
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Devops
Prometheus Stack / Linux Server Installation
What is Prometheus? rometheus is an open-source monitoring tool that collects metrics and provides visualization tools for the collected data. It is primarily written in GoLang and became part of the Cloud Native Computing Foundation (CNCF) in 2016. Prometheus also allows you to create alerts when metrics reach predefined thresholds, helping you proactively monitor system health. Understanding Metrics Metrics are…
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Server
Recovering from DUO Security MFA Lockout on Windows Server: Safe Mode Uninstallation Guide
Have you installed an MFA solution like DUO Security on your Windows Server, only to find that you can no longer log in via RDP? Even in Safe Mode, you might struggle to uninstall the program because the usual removal options don’t work. Problem: RDP Lockout MFA solutions such as DUO Security can completely block RDP access if: They are…
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Server
Mini Ansible Cheatsheet
#Ping all hosts in inventory ansible all -i inventory.ini -m ping # Run module for specific group ansible web -i inventory.ini -m shell -a "uptime" # Run a Playbook ansible-playbook -i inventory.ini playbook.yml Common Modules: ModülİşlevpingPing test fileFile/directory create, delete, permissioncopyCopy file from local to remotetemplateJinja2 template path to destinationyum/aptPackage install/delete (RHEL/Debian)serviceService start/stop/enableuserUser create/deletelineinfileAdd line in filegitRepo Clone/Pull command /…
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Devops
Docker 101 – Core Concepts and Practical Applications
In this article, we will explore how Docker provides advantages in application development and how to containerize an application using Docker. Once an application is written, we’ll learn how it can run on Docker with all its dependencies, and how it can be isolated from the host environment to ensure portability and consistent execution across different systems. Why Docker? Docker…
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Devops
Github Actions VS Gitlab CI/CD
In today’s fast-paced software development landscape, the goal of DevOps culture is to help software companies gain a competitive advantage and align with agile methodologies. This involves testing and deploying code changes in small, manageable increments, allowing development teams to deliver new features and fixes more reliably and efficiently. To achieve this, some of the best-practice CI/CD architectures widely adopted…
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Devops
Installing Prometheus Stack on Kubernetes Cluster
In this article, we’ll take Prometheus—previously installed on a Linux VM—and deploy it inside a Kubernetes cluster. With this setup, we’ll not only monitor applications running inside the cluster but also track the cluster itself using essential metrics. Compared to a VM installation, the Kubernetes setup is slightly different. In Kubernetes, Prometheus runs with the help of Custom Resources (CRDs)…
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