Migrating from AWS to OCI

Cloud migrations are complex undertakings that require careful planning and execution to avoid disruptions and ensure cost-effectiveness. This guide focuses on migrating from Amazon Web Services (AWS) to Oracle Cloud Infrastructure (OCI) and covers key areas, including cloud foundation, governance, security, and a detailed migration plan.

1. Cloud Foundation

Before initiating the migration, it’s crucial to establish a robust cloud foundation in OCI to set the stage for a smooth transition.

A. Account and Subscription Setup

• AWS Equivalence: AWS accounts and Organizations.
• OCI Counterpart: Tenancy and Compartments.
• Key Step: Establish OCI tenancy and organize services using compartments for clear separation of workloads (e.g., development, production).

B. Networking

• AWS Equivalence: VPC (Virtual Private Cloud).
• OCI Counterpart: VCN (Virtual Cloud Network).
• Define CIDR ranges to avoid overlap during hybrid cloud phases.
• Set up Subnets, Gateways (IGW, NAT, Service Gateway), and Route Tables.

Example:

• AWS VPC CIDR: 10.0.0.0/16
• OCI VCN CIDR: 10.1.0.0/16 (to avoid IP conflict).

C. Identity and Access Management (IAM)

• Establish roles and groups.
• OCI provides IAM Policies, which map closely to AWS IAM Policies but offer OCI’s specific syntax.
• Example Policy:

allow group DevOps to manage instance-family in compartment Development

2. Governance

Good governance is vital to maintain an organized and secure cloud environment.

A. Naming Conventions

• Create consistent naming patterns for resources across OCI (similar to AWS tagging strategy). Example Naming Format: project-environment-resourceType-region
• Example: sales-prod-instance-us-ashburn-1

B. Tags and Tag Namespaces

• OCI supports Defined Tags and Free-form Tags similar to AWS.
• Example Tag:

cost-center: marketing owner…