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DevOps RedHat

This document provides an overview of three interconnected DevOps projects that progressively build skills from basic Linux administration to advanced HA
README.md

RHCSA/RHCE DevOps Projects Portfolio

A comprehensive collection of three interconnected DevOps projects that progressively build skills from basic Linux administration to advanced high availability architectures. Each project focuses on different aspects of system administration, infrastructure as code, and automation.

📋 Projects Overview

# Project Status Key Technologies
1 Enterprise Linux Basics ✅ Complete KVM/QEMU, Rocky Linux, Prometheus, Grafana, Bash
2 Linux Automation Infrastructure ✅ Complete Ansible, Docker, PostgreSQL, NGINX, GitHub Actions
3 Linux High Availability 🚧 In Progress Terraform, Ansible, HAProxy, Keepalived, ELK Stack

Project 1: Enterprise Linux Basics

Repository: enterprise-linux-basics-Prjct_01

Overview

A comprehensive learning environment simulating a small-scale enterprise server environment with three hosts (web, app, db) configured manually and securely. Designed to practice essential Linux system administration skills aligned with RHCSA objectives.

Architecture

┌─────────────────────────────────────────────────────┐
│                    Host Machine                     │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐  │
│  │  ServOneVM  │  │ ServTwoVM   │  │ ServThreeVM │  │
│  │   (Web)     │  │   (App)     │  │    (DB)     │  │
│  │  Rocky 9.5  │  │  Rocky 9.5  │  │  Rocky 9.5  │  │
│  │  3GB RAM    │  │  3GB RAM    │  │  3GB RAM    │  │
│  │  1 vCPU     │  │  1 vCPU     │  │  1 vCPU     │  │
│  │  30GB Disk  │  │  30GB Disk  │  │  30GB Disk  │  │
│  └─────────────┘  └─────────────┘  └─────────────┘  │
│         KVM/QEMU Virtualization                     │
└─────────────────────────────────────────────────────┘

Completed Milestones

✅ Milestone A - VM Setup and User Management

  • VMs_installation_Script.sh: Automates creation of 3 Rocky Linux VMs using KVM/QEMU and virt-install
  • Users_Creatiations_Configurations.sh: Interactive user creation with shell selection, sudo privileges, and SSH key distribution

✅ Milestone C - Backup and Monitoring

  • BackUpScript.sh: Automated backup solution for /etc with compression, logging, and 60-day retention
  • Monitoring Stack:
    • Prometheus for metrics collection
    • Node Exporter for system metrics
    • Grafana for visualization dashboards
    • Pre-configured systemd services and prometheus.yml

Technologies

  • OS: Rocky Linux 9.5 (RHEL derivative)
  • Virtualization: KVM/QEMU, virt-install
  • Monitoring: Prometheus, Node Exporter, Grafana
  • Scripting: Bash automation
  • Backup: tar, cron

Quick Start

# Create VMs
cd "Milestone A"
sudo ./VMs_installation_Script.sh

# Create users
sudo ./Users_Creatiations_Configurations.sh

# Setup monitoring (on each VM)
cd "Milestone C"
# Install and configure Prometheus, Node Exporter, Grafana

Project 2: Linux Automation Infrastructure

Repository: linux-automation-infrastructure-Prjct_02

Overview

Automates multi-tier application deployment using Ansible with Infrastructure as Code principles. Provisions and configures Linux VMs for complete application infrastructure with CI/CD integration through GitHub Actions.

Architecture

┌─────────────────────────────────────────────────────────────┐
│                    Ansible Control Node                     │
│                    (AnsibleOneVM)                           │
│                           │                                 │
│         ┌─────────────────┼─────────────────┐               │
│         │                 │                 │               │
│    ┌────▼────┐      ┌─────▼─────┐      ┌──────▼──────┐      │
│    │  Web    │      │    App    │      │     DB      │      │
│    │ WebServ │      │  AppServ  │      │  DataServ   │      │
│    │  NGINX  │      │   Docker  │      │  PostgreSQL │      │
│    │ Reverse │      │    App    │      │  Hardened   │      │
│    │  Proxy  │      │ Container │      │             │      │
│    └─────────┘      └───────────┘      └─────────────┘      │
└─────────────────────────────────────────────────────────────┘

Completed Components

✅ Infrastructure

  • VM provisioning using KVM/libvirt with cloud-init
  • Ansible inventory with host groups ([web], [app], [db], [infra])
  • Ansible Vault for secrets management

✅ Ansible Playbooks

Playbook Purpose
site.yml Main orchestration playbook
create-vms.yml VM creation with virt-install
db_hardening.yml PostgreSQL security hardening
docker_setup.yml Docker installation & app deployment

✅ Ansible Roles

  • db_hardening: PostgreSQL installation and security configuration
  • docker_setup: Docker installation and containerized application deployment
  • reverse_proxy: NGINX reverse proxy configuration

✅ CI/CD (GitHub Actions)

  • lint.yml: Ansible linting on code changes
  • idempotency.yml: Playbook idempotency testing
  • docker_deploy.yml: Automated Docker deployment

Technologies

  • Configuration Management: Ansible
  • Containerization: Docker
  • Database: PostgreSQL (hardened)
  • Web Server: NGINX
  • CI/CD: GitHub Actions
  • Secrets: Ansible Vault

Quick Start

# Install required collections
ansible-galaxy collection install community.postgresql community.general

# Run main playbook
ansible-playbook -i inventories/hosts.ini playbooks/site.yml \
  --vault-password-file .vault_pass.txt

Project 3: Linux High Availability

Repository: linux-high-availability-Prjct_03

Overview

Hands-on DevOps project focused on building a High Availability (HA) architecture on cloud platforms. Uses Terraform for infrastructure provisioning, Ansible for configuration management, HAProxy + Keepalived for redundancy, and ELK Stack for observability.

Architecture

┌──────────────────────────────────────────────────────┐
│                         Cloud VPC/VNet               │
│  ┌────────────────────────────────────────────────┐  │
│  │                    Public Subnet               │  │
│  │  ┌─────────────┐           ┌─────────────┐     │  │
│  │  │   lb1       │ ◄───────► │    lb2      │     │  │
│  │  │  HAProxy    │   VRRP    │   HAProxy   │     │  │
│  │  │ Keepalived  │   VIP     │  Keepalived │     │  │
│  │  └──────┬──────┘           └──────┬──────┘     │  │
│  └─────────│─────────────────────────│────────────┘  │
│            │                         │               │
│  ┌─────────│─────────────────────────│────────────┐  │
│  │                    Private Subnet              │  │
│  │  ┌──────▼──────┐           ┌──────▼──────┐     │  │
│  │  │    web1     │           │    web2     │     │  │
│  │  │    Nginx    │ ◄───────► │    Nginx    │     │  │
│  │  │             │   rsync   │             │     │  │
│  │  └─────────────┘           └─────────────┘     │  │
│  └────────────────────────────────────────────────┘  │
│                                                      │
│  ┌────────────────────────────────────────────────┐  │
│  │                    ELK Stack (Docker)          │  │
│  │  Elasticsearch │ Logstash │ Kibana │ Filebeat  │  │
│  └────────────────────────────────────────────────┘  │
└──────────────────────────────────────────────────────┘

Project Roadmap

✅ Milestone 0: Foundations (In Progress)

  • Configure Terraform Provider & Variables
  • Create VPC/VNet, Subnets, Route Table, Security Groups
  • Provision 4 VM Instances with Static Private IPs
  • Configure Ansible Inventory and Test Connectivity

🚧 Milestone 1: Core HA Architecture (Pending)

  • Deploy HAProxy on Load Balancers
  • Configure HAProxy Frontend and Backend Pools
  • Enable HAProxy Stats Page for Monitoring
  • Install and Configure Keepalived for VIP
  • Test VIP Failover Between Load Balancers

⏳ Milestone 2: Backend & Data Sync (Pending)

  • Deploy Nginx on Web Servers
  • Configure HAProxy to Balance Web Servers
  • Implement File Synchronization (rsync/DRBD)
  • Test Data Consistency and Failover

⏳ Milestone 3: Observability & Logging (Pending)

  • Deploy ELK Stack with Docker
  • Configure Log Forwarding with Filebeat
  • Validate Logs in Kibana and Build Dashboard

⏳ Milestone 4: Container Orchestration (Optional)

  • Initialize Docker Swarm Cluster
  • Deploy Sample Web App as Docker Service
  • Configure Health Checks and Service Recovery

⏳ Milestone 5: Disaster Recovery & Cleanup (Pending)

  • Simulate Load Balancer Failure
  • Test Web Server Data Recovery
  • Implement Terraform Destroy and Cleanup
  • Write Final Documentation

Technologies

  • IaC: Terraform (AWS provider ~> 5.0, region: eu-west-1)
  • Configuration: Ansible
  • Load Balancing: HAProxy
  • High Availability: Keepalived (VRRP)
  • Web Server: Nginx
  • Logging: ELK Stack (Elasticsearch, Logstash, Kibana, Filebeat)
  • Orchestration: Docker Swarm (optional)
  • Data Sync: rsync

Quick Start

# Clone and navigate
git clone https://github.com/AhmadMWaddah/linux-high-availability-Prjct_03.git
cd linux-high-availability-Prjct_03/

# Initialize and apply Terraform
cd lha-terraform
terraform init
terraform apply

# Configure and run Ansible
cd ../lha-ansible
ansible all -m ping -i inventories/hosts.ini

🎯 Learning Path Summary

This project collection follows a progressive learning path:

Linux Basics → Automation → High Availability
     │              │              │
     ▼              ▼              ▼
  RHCSA Skills   RHCE Skills   DevOps/SRE Skills
     │              │              │
     ├─ VM Mgmt     ├─ Ansible     ├─ Terraform
     ├─ Users       ├─ Playbooks   ├─ HA Architecture
     ├─ Bash        ├─ Roles       ├─ Load Balancing
     ├─ Monitoring  ├─ Docker      ├─ Failover
     └─ Backups     └─ CI/CD       └─ ELK Stack

📊 Skills Demonstrated

Category Skills
Linux Administration User management, systemd services, file permissions, SSH, cron
Virtualization KVM/QEMU, virt-install, cloud-init
Infrastructure as Code Terraform (AWS), Ansible playbooks and roles
Configuration Management Ansible, Ansible Vault, inventory management
Containerization Docker, Docker Swarm, containerized applications
Web Servers NGINX configuration, reverse proxy
Databases PostgreSQL installation, hardening, security
High Availability HAProxy, Keepalived, VRRP, VIP failover
Monitoring & Logging Prometheus, Grafana, ELK Stack, Filebeat
Scripting Bash automation, validation, error handling
CI/CD GitHub Actions, linting, idempotency testing
Backup & Recovery Automated backups, retention policies, disaster recovery

📁 Repository Structure

RHCSA_RHCE_GitHub/
├── README.md                              # This file
├── RHCSA RHCE Project.md                  # Detailed project documentation
├── enterprise-linux-basics-Prjct_01/      # Project 1
│   ├── Milestone A/                       # VM setup & user management
│   └── Milestone C/                       # Backup & monitoring
├── linux-automation-infrastructure-Prjct_02/  # Project 2
│   ├── playbooks/                         # Ansible playbooks
│   ├── roles/                             # Ansible roles
│   ├── inventories/                       # Inventory files
│   └── .github/                           # GitHub Actions workflows
└── linux-high-availability-Prjct_03/      # Project 3
    ├── lha-terraform/                     # Terraform configurations
    ├── lha-ansible/                       # Ansible configurations
    └── Media/                             # Documentation images

🚀 Getting Started

Prerequisites

  • Linux host with KVM/libvirt support (Projects 1 & 2)
  • AWS account with appropriate permissions (Project 3)
  • Required tools: 
    # Core tools
ansible
terraform
python3-pip

# Virtualization (Projects 1 & 2)
qemu-kvm
libvirt
virt-manager

# Ansible collections
ansible-galaxy collection install community.general community.postgresql

Recommended Order

  1. Start with Project 1 for Linux fundamentals
  2. Move to Project 2 for automation with Ansible
  3. Complete with Project 3 for high availability architecture

📜 License

All projects are licensed under the MIT License – free to use and modify for learning purposes.

🤝 Contributing

These projects are primarily practice labs for learning purposes. Feel free to:

  • Fork and experiment
  • Suggest improvements via issues
  • Extend milestones with additional features

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