Deploying a Spring Boot application on both AWS and Azure means choosing each platform's equivalent managed service for the deployment style in use, container-based or platform-as-a-service, so the application runs natively on both clouds with minimal rework.
Key Points: • On AWS, Elastic Beanstalk handles PaaS-style deployment with built-in scaling and management, while ECS or EKS runs containerized deployments. • On Azure, Azure App Service mirrors Elastic Beanstalk for PaaS deployment, while Azure Kubernetes Service (AKS) handles containerized workloads. • Packaging the application as a Docker image first makes it portable across both ECS/EKS and AKS with the same artifact. • Both platforms provide auto-scaling, integrated monitoring, and managed database services that the application can connect to via environment variables. • Externalizing configuration keeps the same image or artifact deployable to either cloud without code changes.
Example: The same Docker image built once in CI is deployed to Amazon ECS for the AWS environment and to Azure Kubernetes Service for the Azure environment, with only the environment variables for database connections differing between the two.
Interview Tip: A concise interview answer is:
"I'd containerize the application once and deploy the same image to Amazon ECS or EKS on AWS and Azure Kubernetes Service on Azure, or use Elastic Beanstalk and App Service respectively for a simpler PaaS deployment. Keeping configuration externalized through environment variables means the same artifact works on both clouds without changes."