DevOps & Linux Administration
CI/CD, Docker & Cloud Basics
Module VIII: CI/CD, Docker & Cloud Basics.This module introduces Continuous Integration and Continuous Delivery, containerization using Docker, cloud computing fundamentals, deployment pipelines, and scalable modern infrastructure systems.
What is CI/CD?
CI/CD stands for Continuous Integration and Continuous Delivery/Deployment. It is a DevOps practice used to automate software development, testing, and deployment processes.
CI/CD helps teams deliver software updates quickly, reliably, and with fewer manual errors.
CI/CD Pipeline
Continuous Integration (CI)
Continuous Integration is the process of automatically testing and integrating code changes into a shared repository.
Developers regularly push code updates, and automated systems check whether the application builds and works correctly.
Automated Testing
Detects bugs quickly after code changes.
Frequent Commits
Encourages developers to push changes regularly.
Faster Development
Improves collaboration and software quality.
Continuous Delivery & Deployment
Continuous Delivery automatically prepares software for release, while Continuous Deployment automatically deploys applications directly to production servers.
| Concept | Description |
|---|---|
| Continuous Delivery | Software is ready for deployment anytime. |
| Continuous Deployment | Software is automatically deployed after testing. |
Introduction to Docker
Docker is a containerization platform used to package applications and their dependencies into lightweight units called containers.
Containers ensure that applications run consistently across different systems and environments.
Docker Architecture
Lightweight
Containers use fewer resources compared to virtual machines.
Portable
Applications run consistently on different platforms.
Basic Docker Commands
| Command | Purpose |
|---|---|
| docker pull | Downloads Docker images |
| docker run | Runs a container |
| docker ps | Lists running containers |
| docker stop | Stops a running container |
Example
$ docker pull nginx $ docker run -d -p 8080:80 nginx
Introduction to Cloud Computing
Cloud computing provides computing resources such as servers, storage, databases, and networking over the internet.
Instead of managing physical hardware locally, organizations can use cloud platforms to scale infrastructure easily.
Cloud Service Models
| Model | Description |
|---|---|
| IaaS | Infrastructure as a Service |
| PaaS | Platform as a Service |
| SaaS | Software as a Service |
Popular Cloud Providers
Several companies provide cloud infrastructure and services for hosting applications and managing scalable systems.
AWS
Amazon Web Services cloud platform.
Microsoft Azure
Cloud platform by Microsoft.
Google Cloud
Cloud infrastructure platform by Google.
Benefits of Cloud & Containerization
- Scalable infrastructure and deployment
- Reduced hardware management costs
- Fast application deployment
- Improved software portability
- High availability and reliability
- Supports modern DevOps workflows
Summary
In this chapter, we explored CI/CD pipelines, Docker, containerization, cloud computing fundamentals, cloud service models, and deployment automation. These technologies form the foundation of modern DevOps and scalable cloud infrastructure systems.