DevOps Interview QNS

  Scenario: Application Scaling Question: You have a Kubernetes cluster running a web application. The traffic to the application has significantly increased. How would you scale the application horizontally to handle the increased load? Scenario: Node Failure Question: One of the nodes in your Kubernetes cluster has failed. How would you ensure that the applications running on that node are rescheduled to healthy nodes automatically? Scenario: Rolling Updates Question: You need to perform a rolling update for a deployment in your Kubernetes cluster. Explain the steps you would take to ensure zero downtime during the update. Scenario: Persistent Storage Question: Your application requires persistent storage. How would you configure and manage persistent volumes in a Kubernetes cluster to ensure data persistence across pod restarts? Scenario: Pod Communication Question: Two pods in your Kubernetes cluster need to communicate with each other. What Kubernetes resources and config...

  Here are some Docker interview questions with scenario-based answers, tailored for a senior role. These questions cover various aspects of Docker, including volumes and Docker Compose. Docker Basics: Question: Explain what Docker is and its key components. Answer: Docker is a platform for developing, shipping, and running applications in containers. Key components include Docker Engine (runtime), Docker Hub (registry for images), and Docker CLI (command-line interface). Docker Containerization: Question: How do you containerize an application using Docker? Answer: I use a Dockerfile to define the application environment, dependencies, and commands. Then, I build an image with docker build , and finally, I run containers from the image with docker run . Question: Describe a scenario where you'd choose to use Docker containers over virtual machines. Answer: In scenarios where lightweight, portable, and scalable deployments are crucial, Docker containers are preferred. They have les...

  GitHub Branching: Master Branch: The main branch where the stable and production-ready code resides. Feature Branches: Developers create separate branches for new features or bug fixes, keeping the master branch clean. Pull Requests: Developers submit pull requests to merge their changes into the master branch. CI/CD with Webhooks: Continuous Integration (CI): Automatically builds and tests code changes whenever a developer pushes to a branch. Ensures code quality and catches issues early in the development process. Continuous Deployment (CD): Automatically deploys code to staging or production environments after successful CI. Streamlines the release process and reduces manual interventions. Webhooks: GitHub webhooks trigger CI/CD pipelines when events (e.g., code push, pull request) occur. Automation is initiated without manual intervention. Simple Workflow: Developer creates a feature branch for a new task. Code changes are committed to the branch. Developer submits a pull req...