1_OCI to Azure Migration Guide - Nirvan-Pandey/Azure_DOC GitHub Wiki

1_1: Introduction

Migrating from Oracle Cloud Infrastructure (OCI) to Microsoft Azure involves careful planning, execution, and validation to ensure a seamless transition. This document outlines a step-by-step migration process, from cost estimation to final production deployment.

1_2: Migration Process Overview

The migration process is divided into three key phases:

1️⃣ Planning & Preparation – Assessing resources, cost estimation, and designing the Azure architecture.

2️⃣ Implementation & Migration – Setting up Azure environments, transferring data, and configuring applications.

3️⃣ Testing & Deployment – Validating the new environment, ensuring connectivity, and executing the final cutover.

The following table outlines key activities and responsible teams throughout the migration:

πŸ“Œ Migration Task Assignment Table:

Activity Assigned To
Cost estimation using Azure Calculator Architect
Document the inventory in OCI Architect
Plan the network diagram in Azure Architect
Take sign-off from stakeholders Architect
Implement Landing Zone in Azure Architect
Create App/DB services in Azure Architect
Interconnect OCI and Azure Architect
Request App/DB team to share their data App/DB Admin
Transfer App/DB data and backups from OCI to Azure Architect
Ask App/DB team to set up their Application/Database servers App/DB Admin
Configure interconnectivity between subnets in Azure Architect
Test applications & databases in the new Azure environment Testing Team
Ensure Dev environment is ready Dev Team
Ensure Test/UAT environment is ready Testing Team
Ensure Production environment is ready Prod Team/Testing Team
Final cutover day execution All Teams
Go/No-Go Decision All Teams/Client Team
Migration completion confirmation All Teams

1_3: Step-by-Step Migration Plan

πŸ“Œ Phase 1: Planning & Preparation

πŸ”Ή Step 1: Cost Estimation & Budgeting (Architect)

  • Use the Azure Pricing Calculator to estimate the cost of compute, storage, and networking resources.

  • Compare OCI vs. Azure pricing to optimize budget allocation.

πŸ”Ή Step 2: Inventory Documentation & Assessment (Architect)

  • Document all OCI resources (VMs, databases, storage, networking).

  • Identify dependencies and create a migration strategy.

πŸ”Ή Step 3: Network Architecture Design in Azure (Architect)

  • Design Azure Virtual Network (VNet), subnets, NSGs, and routing.

  • Plan for ExpressRoute, VPN, or Azure Virtual WAN for connectivity.

  • Create a network diagram for approval.

πŸ”Ή Step 4: Stakeholder Sign-Off (Architect)

  • Review the migration plan, security policies, and compliance requirements.

  • Obtain formal approval from business and IT stakeholders before execution.

πŸ“Œ Phase 2: Implementation & Migration

πŸ”Ή Step 5: Set Up Azure Landing Zone (Architect)

  • Deploy Resource Groups, IAM roles, security policies, and monitoring.

  • Ensure governance and access controls are in place.

πŸ”Ή Step 6: Provision Compute & Database Services (Architect)

  • Set up Azure Virtual Machines (VMs), Azure SQL, Cosmos DB, or other required services.

  • Validate that configurations meet workload requirements.

πŸ”Ή Step 7: Establish OCI-to-Azure Connectivity (Architect)

  • Configure VPN, ExpressRoute, or Private Link for secure data transfer.

  • Validate connectivity and ensure low-latency, high-speed migration.

πŸ”Ή Step 8: Request Data from App/DB Team (App/DB Admin)

  • Ask App/DB teams to prepare data for migration.

  • Define database backup and restoration procedures.

πŸ”Ή Step 9: Data Migration Execution (Architect)

  • Use tools like Azure Data Migration Service, AzCopy, or Database Migration Service.

  • Transfer application and database backups from OCI to Azure.

  • Verify data integrity and consistency post-migration.

πŸ”Ή Step 10: Application & Database Setup (App/DB Admin)

  • Deploy applications and configure databases in Azure.

  • Perform necessary security and performance tuning.

πŸ”Ή Step 11: Subnet & Service Interconnectivity in Azure (Architect)

  • Ensure proper routing and NSG configuration for seamless communication between Azure subnets.

πŸ“Œ Phase 3: Testing & Deployment

πŸ”Ή Step 12: Application & Database Testing (Testing Team)

  • Conduct functional, performance, and security testing of migrated applications.

  • Identify and resolve any connectivity or compatibility issues.

πŸ”Ή Step 13: Environment Readiness Validation

  • Ensure Dev environment is ready (Dev Team)

  • Ensure UAT/Test environment is ready (Testing Team)

  • Ensure Production environment is ready (Prod Team/Testing Team)

πŸ”Ή Step 14: Final Cutover Execution (All Teams)

  • Perform the final switch from OCI to Azure.

  • Monitor the transition closely to ensure a smooth go-live.

πŸ”Ή Step 15: Go/No-Go Decision (All Teams/Client Team)

  • Evaluate system performance, business readiness, and risk assessment.

  • Obtain final approval before confirming migration completion.

πŸ”Ή Step 16: Migration Completion & Post-Migration Support (All Teams)

  • Conduct a post-migration review to identify areas for optimization.

  • Provide ongoing support and monitoring to maintain performance.

1_4: Conclusion

Migrating from OCI to Azure requires strategic planning, collaboration, and thorough testing. By following this structured approach, organizations can

achieve a seamless, cost-effective, and secure migration while leveraging Azure’s powerful cloud capabilities.

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