An organization runs a decades-old engineering simulation that still relies on a proprietary kernel driver and an operating system version no longer supported on modern hardware. The application is business-critical but the source code is unavailable, and rewriting it is not feasible before next year's budget cycle. The company wants to move this workload to Google Cloud quickly to free up on-premises data center space and gain elastic capacity for peak simulation runs. Which migration approach offers the greatest business value in this situation?
Rehost the virtual machine to Compute Engine with minimal changes.
Refactor the codebase into microservices and deploy on Cloud Run.
Replatform the application by containerizing it and deploying on Google Kubernetes Engine.
Re-imagine the workload as a managed SaaS solution and phase out the current software.
A rehost, or "lift-and-shift," migration copies the existing virtual machine image to Compute Engine with little or no modification. For highly specialized legacy software where source code changes are impractical, rehosting provides the fastest path to the cloud, avoids the cost and risk of refactoring, and lets the business retire on-premises hardware while immediately gaining Google Cloud's elastic resources. Replatforming, refactoring, or fully re-imagining the application would delay migration and require code access, so they do not meet the stated constraints.
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What does 'rehost' or 'lift-and-shift' migration mean?
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Why would replatforming or refactoring be a poor choice for this situation?
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What advantages does Compute Engine provide for rehosting legacy applications?
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What is rehosting in cloud migration?
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Why is replatforming not suitable in this scenario?
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