DevOps

How I Use Terraform to Provision and Manage AWS Infrastructure Efficiently Infrastructure as Code (IaC) has become a critical part of modern cloud operations, and Terraform is one of the most popular tools for automating cloud infrastructure deployment. In this article, I'll share how I use Terraform to build and manage AWS resources such as Virtual Private Clouds (VPCs), EC2 instances, Application Load Balancers (ALBs), and Auto Scaling Groups. Building AWS Infrastructure with Terraform My infrastructure deployment process begins by defining all AWS resources as code. This approach ensures consistency, repeatability, and easier management across multiple environments. The first step is creating a secure network architecture using a VPC. Within the VPC, I configure public and private subnets, route tables, internet gateways, and other networking components required for application deployment. Once the networking layer is ready, I deploy EC2 instances inside private su...

Docker has transformed the way modern applications are built, tested, and deployed. As one of the most widely used containerization platforms, Docker enables developers and DevOps engineers to package applications with all their required dependencies into lightweight, portable containers. This eliminates the common "it works on my machine" problem and ensures applications behave consistently across development, testing, staging, and production environments. In this article, I'll explain how I use Docker in real-world DevOps projects, covering Docker architecture, images, containers, Dockerfiles, storage, networking, image optimization techniques, deployment workflows, and solutions to common production issues. Why Docker Is Essential in Modern DevOps One of the biggest challenges in software development is maintaining consistency across multiple environments. Different operating systems, library versions, or missing dependencies can cause unexpected application ...

Complete CI/CD Pipeline Using GitHub, Jenkins, Maven, SonarQube, Nexus, and Docker A well-designed CI/CD pipeline plays a critical role in modern DevOps practices by automating software delivery, improving code quality, and reducing deployment risks. In this article, I will explain how I build an automated CI/CD pipeline using GitHub, Jenkins, Maven, SonarQube, Nexus Repository, Docker, and Docker Hub. Source Code Management with GitHub The CI/CD workflow begins with storing the application source code in GitHub. Developers regularly push code changes or create pull requests to collaborate on features and bug fixes. Whenever new code is pushed to the repository, GitHub triggers Jenkins automatically through a webhook. This integration helps start the CI/CD pipeline without manual intervention. Code Checkout Stage in Jenkins The first stage of the pipeline is the checkout process. Jenkins connects to the GitHub repository and pulls the latest version of the source code. ...

These are the basic commands you’ll use often when working with Kubernetes. Think of them as tools to check , create , change , and fix things inside your Kubernetes system. 1. Viewing What's Running These commands help you see what’s going on inside your Kubernetes cluster. kubectl get pods # shows all running pods kubectl get deployments # shows all deployments kubectl get services # shows all services kubectl get all # shows most resources in the current namespace 2. Getting Detailed Information kubectl describe pod my-pod # details about one pod kubectl describe node my-node # details about one node 3. Creating Things kubectl create -f my-deployment.yaml # create from file 4. Updating Things kubectl apply -f my-deployment.yaml # update using the file 5. Deleting Things kubectl delete pod my-pod # delete a specific pod kubectl delete service my-service # delete a specific service Debugging and Fixing Problems ...

  Pod Networking Kubernetes Pods share the same network namespace, allowing them to communicate with each other via localhost . Each Pod is assigned a unique IP address to enable communication across different nodes. Service Networking Services provide stable access points to Pods. Some common types include: ClusterIP : Internal access within the cluster. NodePort : Exposes services on a port on each node for external access. LoadBalancer : Exposes services externally with a load balancer. Ingress Networking Ingress controls external access to services based on HTTP/HTTPS rules. Ingress controllers manage routing traffic to the correct services within the cluster. Network Policies Network policies define rules for communication between Pods and external resources. This allows for fine-grained control over network traffic within the cluster....

Linux administration is one of the most important skills for anyone working in DevOps. From application servers and CI/CD platforms to containers and cloud infrastructure, Linux-based systems are widely used in modern technology environments. In my day-to-day DevOps activities, I regularly work with Linux commands to manage files, monitor processes, troubleshoot services, investigate network problems, analyze logs, and resolve production issues. This guide covers essential Linux administration concepts and commands that are useful for DevOps engineers, along with practical examples of how they can be applied during everyday troubleshooting. 1. Understanding Linux File Permissions Linux uses a permission system to control access to files and directories. The three basic permissions are: Read (r) – Allows a user to view the contents of a file or directory. Write (w) – Allows modifications to a file or directory. Execute (x) – Allows a file to be executed or a director...