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DevOps

Master modern DevOps practices including containerization, orchestration, infrastructure as code, security, and continuous deployment.

What's Covered​

This section provides comprehensive guides for DevOps tools and practices. Learn how to build, deploy, and manage applications using industry-standard tools like Docker, Kubernetes, Terraform, and ArgoCD.

Topics​

Git Cheat Sheet​

Essential Git commands and workflows for version control mastery.

You'll learn:

  • Repository basics (init, clone, status)
  • Staging, committing, and viewing changes
  • Branching, merging, and rebasing
  • Remote repository management
  • Undoing changes and using stash
  • Tags, searching, and history
  • Git workflows and best practices
  • Troubleshooting common issues

Read Git Cheat Sheet →

Docker Guide​

Complete guide to containerization with Docker from basics to advanced patterns.

You'll learn:

  • Docker fundamentals and architecture
  • Creating and managing containers
  • Writing Dockerfiles and best practices
  • Docker Compose for multi-container applications
  • Volumes, networks, and storage
  • Security best practices
  • Optimization and multi-stage builds
  • Docker in production

Read Docker Guide →

Kubernetes Handbook​

Comprehensive resource for orchestrating containers with Kubernetes.

You'll learn:

  • Kubernetes architecture and concepts
  • Pods, Services, and Deployments
  • ConfigMaps and Secrets
  • Persistent storage in Kubernetes
  • Networking and Ingress
  • Scaling and auto-scaling
  • Rolling updates and rollbacks
  • Monitoring and logging
  • Kubernetes security

Read Kubernetes Handbook →

CI/CD Setup​

Step-by-step tutorials for setting up continuous integration and deployment pipelines.

You'll learn:

  • CI/CD concepts and benefits
  • Pipeline design patterns
  • Jenkins setup and configuration
  • GitLab CI/CD pipelines
  • GitHub Actions workflows
  • Automated testing in CI/CD
  • Deployment strategies (blue-green, canary)
  • Docker integration
  • Kubernetes deployment automation

Read CI/CD Setup Guide →

Infrastructure as Code​

Automate infrastructure provisioning and configuration management.

You'll learn:

  • Terraform - Multi-cloud infrastructure provisioning
  • Ansible - Configuration management and automation
  • Best practices for IaC
  • State management
  • Modules and reusability
  • CI/CD integration

Read IaC Guide →

Security​

DevSecOps practices for securing containers, infrastructure, and pipelines.

You'll learn:

  • Container security best practices
  • Vulnerability scanning (Trivy, Snyk)
  • Secrets management (Vault, AWS Secrets Manager)
  • Network security and policies
  • CI/CD security
  • Runtime security

Read Security Guide →

GitOps​

Git-based continuous deployment with ArgoCD.

You'll learn:

  • GitOps principles and workflow
  • ArgoCD installation and configuration
  • Automated synchronization
  • Multi-environment management
  • App of Apps pattern
  • Secrets management with Sealed Secrets
  • Progressive delivery

Read GitOps Guide →

Why DevOps Matters​

Speed & Efficiency​

  • Faster time to market
  • Automated deployments
  • Rapid iteration cycles
  • Consistent environments

Quality & Reliability​

  • Automated testing
  • Early bug detection
  • Security scanning
  • Continuous monitoring

Collaboration​

  • Better team communication
  • Shared responsibility
  • Infrastructure as Code
  • Clear deployment process

DevOps Philosophy​

Core Principles​

1. Automation

  • Automate repetitive tasks
  • Reduce human error
  • Increase consistency
  • Enable faster delivery

2. Continuous Integration

  • Frequent code integration
  • Automated testing
  • Early issue detection
  • Shared code ownership

3. Continuous Delivery

  • Always deployable code
  • Automated deployments
  • Rollback capabilities
  • Production-like environments

4. Monitoring & Feedback

  • Real-time metrics
  • Log aggregation
  • Alert systems
  • Performance monitoring

The DevOps Lifecycle​

┌─────────────────────────────────────────┐
│           PLAN & DESIGN                  │
│  Requirements • Architecture • Strategy  │
└──────────────┬──────────────────────────┘
               ↓
┌─────────────────────────────────────────┐
│           DEVELOP & BUILD                │
│    Code • Test • Build • Package         │
└──────────────┬──────────────────────────┘
               ↓
┌─────────────────────────────────────────┐
│        DEPLOY & OPERATE                  │
│   Release • Configure • Monitor          │
└──────────────┬──────────────────────────┘
               ↓
┌─────────────────────────────────────────┐
│         MONITOR & OPTIMIZE               │
│    Metrics • Logs • Feedback • Improve   │
└──────────────┬──────────────────────────┘
               ↓
          (Repeat Cycle)

Essential Tools​

Containerization​

  • Docker - Container platform
  • Podman - Daemonless container engine
  • containerd - Container runtime

Orchestration​

  • Kubernetes - Container orchestration
  • Docker Swarm - Docker's orchestration
  • Nomad - HashiCorp's orchestrator

CI/CD​

  • Jenkins - Automation server
  • GitLab CI/CD - Integrated pipeline
  • GitHub Actions - GitHub workflows
  • CircleCI - Cloud-based CI/CD
  • ArgoCD - GitOps for Kubernetes

Infrastructure as Code​

  • Terraform - Multi-cloud provisioning
  • Ansible - Configuration management
  • Puppet - Configuration automation
  • Chef - Infrastructure automation

Monitoring & Logging​

  • Prometheus - Metrics monitoring
  • Grafana - Visualization
  • ELK Stack - Logging (Elasticsearch, Logstash, Kibana)
  • Datadog - Full-stack monitoring

Best Practices​

Containerization​

✅ Use official base images ✅ Minimize image layers ✅ Don't run as root ✅ Use .dockerignore ✅ Scan for vulnerabilities ✅ Tag images properly

CI/CD Pipelines​

✅ Fast feedback loops ✅ Fail fast principle ✅ Parallel execution ✅ Artifact versioning ✅ Environment parity ✅ Automated rollbacks

Kubernetes​

✅ Use namespaces ✅ Set resource limits ✅ Implement health checks ✅ Use ConfigMaps/Secrets ✅ Enable RBAC ✅ Regular backups

Learning Path​

Week 1-2: Docker Fundamentals​

  1. Install Docker
  2. Run your first container
  3. Create Dockerfiles
  4. Use Docker Compose
  5. Understand volumes and networks

Week 3-4: CI/CD Basics​

  1. Set up a simple pipeline
  2. Automate tests
  3. Build Docker images in CI
  4. Deploy to staging
  5. Implement rollback strategy

Week 5-8: Kubernetes​

  1. Understand K8s architecture
  2. Deploy first application
  3. Learn Services and Ingress
  4. Manage configuration
  5. Implement monitoring

Beyond: Advanced Topics​

  • Service mesh (Istio, Linkerd)
  • GitOps workflows
  • Multi-cloud strategies
  • Cost optimization
  • Security hardening

Getting Started​

Complete Beginners​

  1. Docker Guide - Start with containers
  2. CI/CD Setup - Automate your workflow
  3. Kubernetes Handbook - Scale your applications

Experienced Developers​

  1. Jump to specific topics you need
  2. Use as reference documentation
  3. Implement best practices in your projects
  4. Explore advanced patterns

System Administrators​

  1. Kubernetes Handbook - Modern infrastructure
  2. CI/CD Setup - Automation strategies
  3. Docker Guide - Container management

Real-World Use Cases​

Microservices​

  • Container per service
  • Kubernetes orchestration
  • Service discovery
  • Load balancing

Continuous Deployment​

  • Automated testing
  • Docker image building
  • Kubernetes rolling updates
  • Zero-downtime deployments

Development Environments​

  • Docker Compose for local dev
  • Consistent across team
  • Easy onboarding
  • Isolated dependencies

Next Steps​

After mastering DevOps basics, explore:

  • Infrastructure as Code - Terraform, Ansible
  • Service Mesh - Istio, Linkerd
  • Observability - Prometheus, Grafana, Jaeger
  • Security - Container security, secrets management
  • GitOps - ArgoCD, Flux