thiyagarajan V

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thiyagarajan V 's Posts

Introduction Jenkins supports distributed builds by using agents (nodes). A Windows agent allows Jenkins to execute jobs on a Windows machine while the Jenkins controller manages the pipeline. This guide explains how to connect a Windows machine as a Jenkins agent using the Launch agent by connecting it to the… Continue Reading How to Connect a Windows Node (Agent) to Jenkins

Introduction While setting up Container1 inside an OpenVZ container, I encountered the following error: ls: cannot access /dev/net/tun: No such file or directory This occurs when the TUN/TAP device is not enabled for the container. Since many networking applications rely on /dev/net/tun to create virtual network interfaces, its absence can… Continue Reading Fixing the /dev/net/tun Error in an OpenVZ Container

Introduction Managing external access to applications in Kubernetes can feel complex—especially when you want secure HTTPS connections. Fortunately, Kubernetes provides a powerful combination of Ingress and automatic SSL certificate management using tools like NGINX Ingress Controller and Cert-Manager. In this guide, you’ll learn how to: Architecture Overview Before we begin,… Continue Reading How to Configure Kubernetes Ingress with Automatic SSL Certificates (Without Helm)

Introduction In modern containerized environments, centralized logging is essential for monitoring, troubleshooting, and maintaining application reliability. Kubernetes workloads generate logs across multiple pods and nodes, which makes log management challenging if logs remain distributed. To solve this, organizations often use the ELK Stack (Elasticsearch, Logstash, and Kibana) for centralized logging… Continue Reading Kubernetes ELK Logging Setup (Filebeat → Logstash → Kibana)

Introduction As a DevOps engineer, maintaining consistency across Kubernetes environments is a constant battle. Manual deployments, ad-hoc kubectl apply commands, and configuration drift often lead to operational headaches and production outages. The solution is GitOps. By adopting ArgoCD, we treat Git as the single source of truth for our cluster… Continue Reading Implementing GitOps with Argo CD: Installation and Initial Deployment

Introduction: In this guide, we’ll set up a lightweight Kubernetes cluster using K3s on CentOS 7. K3s is a fast and easy way to run Kubernetes without heavy resource usage. With one master and multiple worker nodes, you can build a clean, efficient, and production-ready cluster in just a few… Continue Reading How to Install Kubernetes Cluster Using K3s on Centos 7