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Ghost Blog Platform - Proof of Concept

1. Architecture Overview

This Proof of Concept (PoC) deploys the Ghost Blog platform on Azure Kubernetes Service (AKS), ensuring * scalability, high availability, and resilience*. The architecture is designed to handle sudden traffic spikes, support multi-region disaster recovery, and facilitate frequent deployments by multiple DevOps teams.

Architecture Diagram

Below is a high-level diagram of the solution:

src/images/img.png

2. Solution Overview

Key Components & Technologies

  • Azure Front Door: Global load balancing and traffic routing.
  • Azure Application Gateway (WAF enabled): Secure ingress with DDoS protection and SSL termination.
  • Azure Kubernetes Service (AKS): Manages Ghost Blog application pods with auto-scaling capabilities.
  • Azure Redis Cache: Caching layer to optimize performance.
  • Azure MySQL Flexible Server: Managed database backend for Ghost Blog.
  • Azure Blob Storage: Stores blog media files.
  • Azure Monitor, Prometheus, Grafana: Observability stack for logs, metrics, and alerting.
  • Azure Key Vault: Secure storage for sensitive credentials.
  • Azure Functions (Serverless): Implements a function to delete all blog posts when required.

Scaling & Resilience

  • Horizontal Pod Autoscaler (HPA): Dynamically adjusts AKS workload based on CPU/memory usage.
  • Multi-Region Deployment: Supports failover to a secondary Azure region for disaster recovery.
  • Geo-Redundant Storage & Database Backups: Ensures recovery in case of region-wide failures.

CI/CD & Deployment Automation

  • Infrastructure as Code (Terraform): Automates the provisioning of Azure resources.
  • GitHub Actions / Azure DevOps Pipelines: Implements CI/CD for automated deployment.
  • Helm Charts: Manages Ghost Blog deployment on Kubernetes.
  • Rolling Updates & Blue/Green Deployments: Ensures zero downtime during application updates.

Security Best Practices

  • RBAC & Network Policies: Restricts access based on least privilege principles.
  • Web Application Firewall (WAF) & DDoS Protection: Safeguards against cyber threats.
  • Audit Logging & Monitoring: Enables real-time security and compliance visibility.

3. Deployment Guide

Pre-requisites

Ensure the following tools and configurations are set up before deployment:

  • An active Azure Subscription
  • Terraform installed on your local machine
  • Azure CLI configured with appropriate permissions
  • Kubectl installed for interacting with the Kubernetes cluster

Deployment Steps

  1. Clone the Repository:

    git clone <repo-url>
    cd azure-ghost-blog-poc
  2. Initialize Terraform:

    terraform init
  3. Apply Terraform Configuration:

    terraform apply -auto-approve
  4. Deploy Ghost Blog on AKS using Helm:

    helm install ghost ./helm/ghost-chart
  5. Access the Blog:

    • Retrieve the public IP of the service:
      kubectl get svc -n ghost
    • Open the retrieved blog URL in a browser.

4. Observability & Monitoring

To ensure system reliability, the following monitoring tools and techniques are used:

  • Grafana Dashboards: Provides insights into system health, performance, and alerts.
  • Azure Monitor & Log Analytics: Centralized logging for debugging and operational visibility.
  • Prometheus Alerts: Sends real-time notifications in case of failures or anomalies.

5. Future Enhancements

To further improve the solution, the following enhancements are planned:

  • Implement CI/CD for database migrations to streamline updates.
  • Introduce automated performance testing for better reliability assessment.
  • Expand security compliance by integrating additional policies and auditing mechanisms.

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