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🚀 DevOps Core Documentation

Complete DevOps Ecosystem - From Fundamentals to Advanced

📚 Table of Contents

  1. Foundation Knowledge
  2. Development Tools
  3. Containerization
  4. Infrastructure as Code
  5. Configuration Management
  6. CI/CD & Automation
  7. Message Queues & Streaming
  8. Web Infrastructure
  9. Observability & Monitoring
  10. Caching & Performance
  11. System Design Patterns
  12. Secrets Management
  13. Interview Preparation

🎯 Foundation Knowledge

01 - DevOps Topics

Location: 01-DEVOPS-TOPICS/ - Core DevOps concepts and principles - DevOps culture and practices - Continuous improvement methodologies

02 - Operating Systems

Location: 02-OPERATING-SYSTEM/Linux/ - Linux fundamentals - System administration - Shell scripting - Process management

04 - Networking

Location: 04-NETWORKING/ - TCP/IP fundamentals - DNS, DHCP, VPN - Network security basics - Load balancing concepts

💻 Development Tools

03 - Git & Version Control

Location: 03-GIT/ - Git commands and workflows - GitHub integration - Branch strategies - Collaboration practices

Files: - 0-Git-Fundamentals.md - Core Git concepts - 1-Git-Commands.md - Essential Git commands - 2-GitHub-Token-Setup.md - GitHub authentication - README.md - Complete Git guide

🐳 Containerization

05 - Docker & Containers

Location: 05-CONTAINERIZATION/Docker/

Complete Docker Guide: 1. 0-Docker-Fundamentals.md - Containerization fundamentals 2. 1-Installation.md - Setup and installation 3. 2-Docker-Commands.md - Essential Docker commands 4. 3-Dockerfile.md - Building images 5. 4-Docker-Compose.md - Multi-container applications 6. README.md - Docker overview

Topics Covered: - Docker architecture and concepts - Container lifecycle management - Image building and optimization - Best practices

🏗️ Infrastructure as Code

08 - Terraform & IaC

Location: 08-IAC/Terraform/

Topics Covered: - Installation and setup - Structure and commands - Variables and outputs - Conditional expressions - Multi-provider configurations - Modules and reusability - Remote backend - Workspaces - Userdata and provisioning - Vault integration

Packer

Location: 08-IAC/Packer/ - Image building automation - AMI creation - Multi-cloud image management

⚙️ Configuration Management

09 - Ansible

Location: 09-CONFIG-MANAGEMENT/Ansible/

Files: - 0-ansible.md - Ansible fundamentals - 1-password-authentication.md - Authentication setup - inventory.ini - Inventory management - roles.yaml - Role definitions - first-playbook/ - Example playbooks - test/ - Testing configurations

Consul

Location: 09-CONFIG-MANAGEMENT/Consul/

Topics: - Service discovery - Health checking - Key-value store - Docker integration - ACL configuration

Files: - Consul.md - Core concepts - consul-docker.md - Docker setup - consul-docker-acl.md - ACL configuration - docker-compose.yml - Docker Compose setup

🔄 CI/CD & Automation

06 - CI/CD Fundamentals

Location: 06-CICD/

Overview Files: 1. 1-CICD.md - CI/CD fundamentals 2. 2-JENKINS.md - Jenkins overview 3. 3-GITHUB-ACTIONS.md - GitHub Actions guide 4. 4-AZURE-DEVOPS.md - Azure DevOps overview

Jenkins

Location: 06-CICD/Jenkins/ - Installation and setup - Pipeline configuration - Integration with Maven, SonarQube, Argocd - Kubernetes deployment

GitLab CI

Location: 06-CICD/GitLab-CI/ - .gitlab-ci.yml configuration - Pipeline examples - Best practices

ArgoCD

Location: 06-CICD/ArgoCD/ - GitOps principles - Application deployment - Kubernetes integration - Workflow diagrams

SonarQube

Location: 06-CICD/SonarQube/

Complete Guide: 1. 1-sonarqube-server-setup.md - Server installation 2. 2-sonarqube-project-local-scan.md - Local scanning 3. 3-sonarqube-local-scan-using-docker.md - Docker-based scanning - Docker Compose setup included

07 - Deployment Strategies

Location: 07-DEPLOYMENT-STRATEGIES/

Strategies Covered: - Blue-Green deployment - Canary deployment - Rolling updates - Recreate strategy - A/B testing - Complete with diagrams

📨 Message Queues & Streaming

10 - Apache Kafka

Location: 10-MESSAGE-QUEUES/Apache-Kafka/ - Kafka fundamentals - Producer/Consumer patterns - Kafka UI setup - Real-time streaming

RabbitMQ

Location: 10-MESSAGE-QUEUES/RabbitMQ/

Complete Setup: - rabbitmq.md - Core concepts - docker-compose-rabbitmq.md - Docker setup - producer.js / consumer.js - Node.js examples - ui-workflow.md - Management UI guide - Docker Compose configuration

Apache Airflow

Location: 10-MESSAGE-QUEUES/Apache-Airflow/ - Workflow orchestration - DAG creation - Docker setup - Scheduling and monitoring

🌐 Web Infrastructure

11 - NGINX

Location: 11-NGINX/

Complete NGINX Guide: 1. 0-NGINX-Overview.md - Introduction 2. 1-WEB-SERVER.md - Web server configuration 3. 2-REVERSE-PROXY.md - Reverse proxy setup 4. 3-API-KEY-AUTHENTICATION.md - API security 5. 4-LOAD-BALANCER.md - Load balancing 6. 5-CACHING SERVER.md - Caching configuration 7. 6-API-GATEWAY.md - API gateway patterns 8. 7-SSL-TLS-Termination.md - SSL/TLS setup

📊 Observability & Monitoring

12 - Prometheus

Location: 12-OBSERVABILITY/prometheus/ - Metrics collection - PromQL queries - Helm deployment - Alerting rules

Grafana

Location: 12-OBSERVABILITY/grafana/ - Dashboard creation - Data source integration - Helm deployment - Visualization best practices

Grafana Observability Stack

Location: 12-OBSERVABILITY/Grafana-Observability-Stack/

Complete Tutorials: - Prometheus end-to-end setup - Grafana + Prometheus integration - Grafana for Loki (log monitoring) - Prometheus Node Exporter - Promtail configuration - Loki storage (S3, Azure Blob, DO Spaces) - Systemd integration

OpenTelemetry

Location: 12-OBSERVABILITY/OpenTelemetry/ - Distributed tracing - Setup and configuration - Code examples - Demo applications

⚡ Caching & Performance

13 - Redis & Caching

Location: 13-CACHING/

Complete Redis Guide:

  1. 0-CACHING.md - Caching fundamentals
  2. What is caching?
  3. Cache-aside pattern
  4. Cache strategies
  5. TTL and expiry

  6. Cache problems and solutions

  7. 1-Node.js + Redis.md - Node.js integration

  8. Cache-aside implementation
  9. Express.js examples

  10. Error handling

  11. 2-Go + Redis.md - Go integration

  12. Gin framework examples
  13. Redis client setup

  14. Production patterns

  15. 3-system design diagram.md - Architecture

  16. High-level design
  17. Load balancing

  18. Cluster setup

  19. 4-deploy Redis.md - Deployment options

  20. VM deployment
  21. Docker deployment

  22. Kubernetes deployment

  23. 5-Redis HA.md - High availability

  24. Master-Replica setup
  25. Sentinel configuration
  26. Redis Cluster

  27. Backup strategies

  28. 6-Caching-overview.md - Overview and best practices

Redis Deep Dive: - Redis/redis.md - Complete Redis commands guide - String operations - Hash operations - List operations - Set operations - Sorted sets - TTL management - Pub/Sub - Streams - Persistence - Security

  • Redis/docker-compose.yml - Docker setup

Images: - Screenshot 2025-11-24 220538.png - Cache-aside pattern - Screenshot 2025-11-24 220631.png - Popular profiles cache

🏗️ System Design Patterns

15 - Architecture Patterns

Location: 15-SYSTEM-DESIGN/

Complete System Design Library:

Architecture Patterns

  1. Microservices Architecture
  2. Service decomposition and boundaries
  3. API Gateway integration
  4. Service discovery and communication
  5. Database per service pattern
  6. Saga pattern for distributed transactions

  7. Tools: Kubernetes, Istio, Kong, Consul

  8. Event-Driven Architecture

  9. Event sourcing and CQRS
  10. Message brokers and event buses
  11. Event patterns and workflows
  12. Async communication strategies

  13. Tools: Kafka, RabbitMQ, AWS EventBridge

  14. API Gateway Pattern

  15. Request routing and aggregation
  16. Authentication and authorization
  17. Rate limiting and throttling

  18. Tools: Kong, NGINX, AWS API Gateway

  19. Service Mesh Pattern

  20. Service-to-service communication
  21. Traffic management and observability
  22. Security and policy enforcement
  23. Tools: Istio, Linkerd, Consul Connect

Data Patterns

  1. Database Sharding
  2. Horizontal partitioning strategies
  3. Shard key selection
  4. Routing and rebalancing

  5. Tools: PostgreSQL, MongoDB, Vitess

  6. CQRS Pattern

  7. Command Query Responsibility Segregation
  8. Read/write model separation
  9. Event sourcing integration

  10. Tools: Event Store, Kafka, PostgreSQL

  11. Distributed Caching

  12. Multi-level caching strategies
  13. Cache invalidation patterns
  14. Consistency models
  15. Tools: Redis Cluster, Memcached, Hazelcast

Reliability Patterns

  1. Circuit Breaker Pattern
  2. Fault tolerance and graceful degradation
  3. State management (Closed/Open/Half-Open)
  4. Fallback strategies
  5. Monitoring and metrics

  6. Tools: Hystrix, Resilience4j, Istio, opossum

  7. Rate Limiting Pattern

  8. Traffic control and throttling
  9. DDoS protection
  10. Token bucket and leaky bucket algorithms

  11. Tools: NGINX, Kong, Redis, AWS WAF

  12. Load Balancing Patterns

    • Round-robin, least connections, IP hash
    • Layer 4 vs Layer 7 load balancing
    • Health checks and SSL termination
    • Session persistence strategies
    • Tools: NGINX, HAProxy, AWS ALB/NLB, Envoy

Performance Patterns

  1. CDN Architecture

    • Edge caching and content distribution
    • Geographic routing
    • Cache invalidation strategies
    • Tools: CloudFront, Cloudflare, Fastly

  2. Message Queue Patterns

    • Async processing and decoupling
    • Queue vs Topic patterns
    • Dead letter queues
    • Tools: Kafka, RabbitMQ, AWS SQS

Pattern Selection Guide

Requirement Recommended Pattern
Scale services independently Microservices Architecture
Async communication Event-Driven Architecture
Centralized API management API Gateway Pattern
Service-to-service security Service Mesh Pattern
Scale database horizontally Database Sharding
Separate read/write workloads CQRS Pattern
Improve read performance Distributed Caching
Handle service failures Circuit Breaker Pattern
Protect from traffic spikes Rate Limiting Pattern
Distribute traffic Load Balancing Patterns
Global content delivery CDN Architecture
Decouple components Message Queue Patterns

Learning Path

  1. Beginner - Start with Load Balancing and Caching
  2. Intermediate - Learn Microservices and API Gateway
  3. Advanced - Master Event-Driven, CQRS, and Service Mesh

🔐 Secrets Management

14 - HashiCorp Vault

Location: 14-SECRETS-MANAGEMENT/Hashicorp-Vault/

Topics: - Vault installation - Secret storage - Dynamic secrets - Authentication methods - Policy management - Docker deployment - Terraform integration

📝 Interview Preparation

16 - DevOps Interview Questions

Location: 16-INTERVIEW-QUESTIONS/

Resources: - DEV OPS INTERVIEW QUESTIONS.md - Common questions - document_compressed.pdf - Interview guide - kubernetes.pdf - Kubernetes-specific questions

🗺️ Learning Paths

Beginner Path (0-3 months)

  1. 01-DEVOPS-TOPICS - Understand DevOps culture and principles
  2. 02-OPERATING-SYSTEM - Linux fundamentals and shell scripting
  3. 03-GIT - Version control and collaboration
  4. 04-NETWORKING - TCP/IP, DNS, network basics
  5. 05-CONTAINERIZATION - Docker basics and containerization

Intermediate Path (3-6 months)

  1. 05-CONTAINERIZATION - Advanced Docker and Kubernetes
  2. 06-CICD - CI/CD pipelines with Jenkins/GitHub Actions
  3. 07-DEPLOYMENT-STRATEGIES - Blue-Green, Canary, Rolling updates
  4. 08-IAC - Terraform for infrastructure as code
  5. 09-CONFIG-MANAGEMENT - Ansible for configuration
  6. 11-NGINX - Web server and reverse proxy

Advanced Path (6-12 months)

  1. 10-MESSAGE-QUEUES - Kafka, RabbitMQ for async communication
  2. 12-OBSERVABILITY - Prometheus, Grafana, distributed tracing
  3. 13-CACHING - Redis for performance optimization
  4. 14-SECRETS-MANAGEMENT - Vault for secure secrets
  5. 15-SYSTEM-DESIGN - Microservices, event-driven architecture
  6. 16-INTERVIEW-QUESTIONS - Prepare for DevOps interviews

🎯 Quick Reference

Most Used Tools

  • Docker - Containerization
  • Terraform - Infrastructure provisioning
  • Ansible - Configuration management
  • Jenkins - CI/CD automation
  • Prometheus - Monitoring
  • Redis - Caching
  • NGINX - Web server/reverse proxy

Essential Skills

  • Linux command line
  • Git workflows
  • Docker and containers
  • CI/CD pipelines
  • Infrastructure as code
  • Monitoring and logging
  • Security best practices

📊 Documentation Statistics

  • Total Categories: 13
  • Total Tools: 30+
  • System Design Patterns: 12
  • Total Files: 365+
  • Coverage: Complete DevOps ecosystem with system design patterns

🚀 Getting Started

  1. New to DevOps?
  2. Start with DEVOPS-TOPICS/
  3. Then move to OPERATING-SYSTEM/Linux/

  4. Learn GIT/ basics

  5. Have Programming Background?

  6. Jump to CONTAINERIZATION/Docker/
  7. Then CICD/ for automation

  8. Learn IAC/Terraform/

  9. System Administrator?

  10. Start with CONFIG-MANAGEMENT/Ansible/
  11. Learn IAC/Terraform/

  12. Move to OBSERVABILITY/

  13. Preparing for Interview?

  14. Review INTERVIEW-QUESTIONS/
  15. Study SYSTEM-DESIGN/ patterns
  16. Practice with each tool's documentation
  17. Build projects using multiple tools

💡 Best Practices

Documentation

  • Each tool has its own README
  • Examples include working code
  • Diagrams explain architecture
  • Step-by-step tutorials provided

Learning Approach

  • Read overview first
  • Follow hands-on examples
  • Build real projects
  • Practice regularly

Tool Integration

  • Tools are designed to work together
  • Follow integration guides
  • Use Docker Compose for local development
  • Deploy to cloud for production
  • Cloud Platforms: ../CLOUD/ - AWS, Azure
  • Cybersecurity: ../CYBERSECURITY/ - Security practices
  • Development: ../DEVELOPMENT/ - Go, MERN stack
  • GenAI: ../GENAI/ - ML operations

📞 Support & Contribution

Finding Information

  • Use this README as navigation
  • Each folder has specific documentation
  • Search for keywords in file names
  • Check related sections for integration

Continuous Learning

  • DevOps is constantly evolving
  • Keep documentation updated
  • Add new tools and practices
  • Share knowledge with team

Last Updated: January 5, 2026
Status: ✅ Complete and organized
Coverage: Full DevOps ecosystem from fundamentals to advanced

Ready to start your DevOps journey! 🚀