Architectures - Use a split-brain DNS configuration to host a web app in GCP

Problem:

• A company needs to host a web application with distinct traffic management for public and private users. The current infrastructure struggles with security, performance, and reliability, particularly in differentiating internal and external traffic routes.

Objective:

• Implement a split-brain DNS architecture to:
• Ensure secure, high-performance routing for public and private users.
• Utilize Azure Front Door for public access and Azure Application Gateway for private access.
• Integrate Azure DNS and ExpressRoute for seamless and secure traffic management.

Solution:

Components Involved

• Google Cloud DNS: Manages DNS records for public and private DNS zones.
• Google Cloud Load Balancer: Distributes incoming traffic across multiple instances.
• Google Cloud CDN: Caches content for public access, reducing latency.
• VPC Network: Isolates private and public subnet environments.
• Cloud Interconnect: Provides dedicated, private connectivity from on-premises to Google Cloud.
• Firewall Rules: Controls traffic to and from the instances.
• Google Cloud Armor: Protects against DDoS attacks and other threats.

Security

• Google Cloud Armor: Protects against web-based attacks.
• Firewall Rules: Define ingress and egress traffic rules at the network level.
• SSL/TLS Encryption: Ensures secure communication between clients and servers.
• IAM Policies: Manage access to GCP resources with fine-grained permissions.
• Cloud Interconnect: Secures private connections, minimizing public internet exposure.

This setup provides a secure, efficient, and highly available environment for web applications on GCP, catering to both public and private access requirements.