The Challenges of Application Modernization
Application modernization is complex. There are multiple ways to consider to as part of the solution design and each pattern has its own pros and cons.
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| Pattern | Approach | Analysis |
|---|---|---|
| Lift & shift | Attempting to rehost the legacy application on to the new cloud based infrastructure. | The benefits are limited as code is not modified, but it’s a good starting point to migrate to cloud infrastructure. The original challenges will remain however there will be some benefits from a cloud infrastructure of portability and scalability. There are also no guarantees that the legacy application will behave as expected in the new setup. |
| Refactoring | Attempting to rewrite or restructure the application codebase to benefit from cloud based features. | A complex and potentially expensive approach but it’s the right approach depending on the application so it can benefit from migrating from a monolith to a microservices architecture and this benefiting from cloud features such as containerization and orchestration. |
| Re-platforming | A compromise approach where software development is kept to a minimum to allow the application to work on a cloud infra. | It might be a necessary step if Lift & Shift fails. The purists may not appreciate this approach as it can be considered as a non-ideal compromise and may be fraught with support issues. It might make sense if the legacy application is going to be retired in the short/medium term. |
