The organization had a critical application running in its source AWS account. Due to operational requirements, they needed to migrate this application to a different AWS account, referred to as the target AWS account. The source account contained two key components: EC2 instances and RDS databases.

This case study outlines the successful migration of an application from one AWS (Amazon Web Services) account to another. The migration process involved creating Amazon Machine Images (AMIs) for EC2 instances, taking backups of RDS (Relational Database Service) instances, sharing these images and backups with the target AWS account, provisioning new EC2 instances using the AMIs, and restoring RDS instances from the backups.

Creating EC2 AMIs

• The migration process commenced with the creation of Amazon Machine Images (AMIs) for the EC2 instances running in the source AWS account. AMIs captured the entire configuration, including the operating system, software, and data on the instances.
• These AMIs were essential for recreating the EC2 instances in the target AWS account with identical configurations.

Snapshot Creation for RDS Databases

• In parallel, snapshots were created for the RDS databases in the source AWS account. These snapshots contained the database schema, tables, and data.
• The snapshots were crucial for the subsequent restoration of the RDS databases in the target AWS account.

Sharing AMIs and RDS Backups

• Once the EC2 AMIs and RDS backups were created, they were shared with the target AWS account. Permissions were configured to ensure the target account had the necessary access to these resources.
• AWS Identity and Access Management (IAM) roles and policies were established to govern secure access.

Provisioning EC2 Instances in the Target Account

• After sharing the EC2 AMIs, the target AWS account provisioned new EC2 instances based on these AMIs. The specifications and configurations matched those of the source EC2 instances.
• Security groups, key pairs, and network settings were replicated in the target account.

Restoring RDS Instances in the Target Account

• Using the shared RDS backups, the target AWS account initiated the restoration of the RDS instances. Configuration settings, including security groups and parameter groups, were adjusted as required.
• This step ensured that the RDS instances were identical to their source counterparts.

Testing and Verification

• After provisioning the EC2 instances and restoring the RDS instances, extensive testing was conducted to ensure the application’s functionality remained intact.
• Load testing, data validation, and functional testing were performed to confirm the migration’s success.

• After the migration was confirmed as successful, DNS records were updated, and network routing was adjusted to direct traffic to the newly migrated application in the target AWS account.
• Resource cleanup was executed in the source AWS account, including the termination of EC2 instances and deletion of unnecessary AMIs and backups.

The migration of the application from the source AWS account to the target AWS account was executed smoothly, with minimal downtime and no data loss. The process highlighted the significance of snapshot-based strategies in AWS migration, secure sharing mechanisms, and meticulous replication of configuration settings.

Now the benefits from hosting its application in the target AWS account, aligned with its operational requirements.

We have been able to optimize their costs and improve their security. Our customer is very happy now there has been.

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