DevOps Mastery: CI/CD, Automation, and Linux Essentials for Production

In the fast-paced world of software development, DevOps bridges the gap between code and production. This guide dives deep into CI/CD pipelines, infrastructure automation, containerization, and Linux system management, with a focus on security, scalability, and best practices. Whether you’re deploying a Java app or managing cloud infrastructure, this post equips you with actionable examples and modern workflows.

Table of Contents

1. CI/CD: The Backbone of Modern Development

   • Continuous Integration (CI)
   • Continuous Deployment (CD)
   • Example: Jenkins Pipeline

2. Day-to-Day DevOps Activities

   • Monitoring & Alerting
   • Infrastructure as Code (IaC)
   • Collaboration Tools

3. Ansible: Configuring a Web Server Securely

   • Idempotent Playbook Example

4. Bash Scripting: Service Management with Error Handling

   • Restarting Apache Safely

5. Docker: Building and Deploying a Java App

   • Multi-Stage Dockerfile

6. Terraform: Secure Azure VM Deployment

   • SSH Keys & Network Security

7. Linux Commands: Modern Tools for Sysadmins

   • Permissions, Networking, and Troubleshooting

8. Security Best Practices

• Ansible Vault, Docker Hardening, Terraform State

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