TPTC is a software-focused organization delivering digital services and application platforms. As part of its modernization strategy, TPTC initiated a cloud transformation initiative to migrate its existing environment to Amazon Web Services (AWS) and establish a scalable hosting foundation for its cPanel-based workloads.

The objective was to improve availability, strengthen security controls, simplify operations, and build a resilient cloud architecture capable of supporting business growth.

Problem Statement / Definition

TPTC’s legacy hosting model relied on traditional infrastructure with limited flexibility, manual operational processes, and growing challenges in maintaining performance and uptime.

The organization required a modern cloud-based architecture that could:

• Deliver high availability
  • Provide stronger perimeter security
  • Enable controlled scalability
  • Reduce infrastructure management overhead
  • Establish a structured, well-segmented network design

Challenges Faced

• Availability & Resilience Risks
  Single-environment hosting increased exposure to outages and service disruptions.
• Security Exposure
  Internet-facing workloads required improved traffic filtering and threat protection mechanisms.
• Limited Scalability
  Scaling compute resources required manual intervention and capacity planning.
• Network Segmentation Limitations
  The legacy environment lacked structured isolation between application tiers.
• Operational Overhead
  System administration, updates, and infrastructure maintenance required continuous effort.

Proposed Solution & Architecture

VArrow Technologies designed and implemented a multi-tier AWS architecture aligned with AWS best practices.

According to the architecture diagram (TPTC cPanel on AWS)

tptc-aws-diagram-2025-08-05

, the solution introduced:

• Multi-AZ High Availability Design

Workloads were distributed across two Availability Zones, improving resilience and fault tolerance.

• Structured VPC & Subnet Segmentation

As defined in the CIDR planning document (TPTC VPC Design)

TPTC-CIDR-Block-2025-08-05

:

• VPC CIDR: 10.100.0.0/16

Six subnets were implemented:

• Public Subnets
  • Private Subnets
  • Intra (Isolated) Subnets

This segmentation enabled clear separation of responsibilities:

✔ Public Tier → Internet-facing components
✔ Private Tier → Application workloads
✔ Intra Tier → Isolated internal resources

• Secure Traffic Flow Architecture
• Internet Gateway (IGW) for controlled inbound access
  • NAT Gateway for secure outbound connectivity
  • Strict route table isolation
• Highly Available Compute Layer
• cPanel EC2 Instance 1 (AZ1)
  • cPanel EC2 Instance 2 (AZ2)

Ensuring workload redundancy and service continuity.

• Application Entry & Protection
• Application Load Balancer (ALB) for traffic distribution
  • AWS WAF for application-layer protection
• Security & Network Controls
• Security Groups enforcing least privilege
  • Network ACLs for subnet-level protection

Outcomes of the Project & Success Metrics

• Improved Availability

Multi-AZ deployment significantly reduced single-point-of-failure risks.

• Enhanced Security Posture

AWS WAF introduced intelligent traffic filtering and protection from common web threats.

• Scalable Infrastructure

Auto Scaling capabilities enabled dynamic resource adjustments based on workload demand.

• Optimized Traffic Distribution

ALB improved application responsiveness and reliability.

• Strong Network Isolation

Three-tier subnet design reduced lateral movement risks and improved security boundaries.

• Reduced Operational Complexity

AWS-managed networking and security components simplified administration.

TCO Analysis Performed

Before Migration

• Fixed-capacity infrastructure
  • Hardware lifecycle & maintenance costs
  • Limited elasticity

After Migration

• Consumption-based cloud model
  • No hardware refresh cycles
  • Pay-as-you-go scaling

Financial Impact

TPTC benefited from:

✔ Cost predictability
✔ Elimination of hardware CAPEX
✔ Improved utilization efficiency

Lessons Learned

• Network Design is Foundational

Early CIDR planning and subnet segmentation prevented future scaling constraints.

• High Availability Requires Architectural Intent

Multi-AZ placement proved critical for workload resilience.

• Security Must Be Layered

Combining WAF, Security Groups, and subnet isolation delivered stronger defense-in-depth.

• Cloud Enables Operational Agility

Infrastructure scaling and failover became significantly simpler.

• Load Balancing Improves Stability

ALB reduced traffic bottlenecks and improved user experience.

Detailed Case Study Breakdown (Migration)

Requirement

• Migrate cPanel workloads to AWS
  • Improve availability & resilience
  • Strengthen application security
  • Implement scalable infrastructure
  • Establish structured VPC design

Challenge

• Designing secure AWS network segmentation
  • Maintaining uptime during transition
  • Protecting internet-facing workloads
  • Ensuring scalable architecture

How AWS Technology Overcame the Challenge

• High Availability
  Multi-AZ EC2 deployment minimized downtime risks.
• Security & Protection
  AWS WAF filtered malicious traffic and common exploits.
• Network Isolation
  Public / Private / Intra subnet strategy improved security posture.
• Traffic Optimization
  ALB ensured efficient request distribution.
• Controlled Internet Access
  NAT Gateway secured outbound connectivity.

End Result & Client Benefit

• Resilient Cloud Infrastructure
  Improved uptime and reliability.
• Strong Security Controls
  Layered AWS-native protections reduced attack surface.
• Scalable Hosting Platform
  Infrastructure can now adapt to workload changes.
• Optimized Performance
  Load balancing enhanced responsiveness.
• Future-Ready Architecture
  Network design allows seamless expansion.