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Introduction to Cloud Migration'Refactor vs Lift and Shift vs Containers' has been the town's debate regarding migrating applications to the cloud. What makes the best development approach to Application for an enterprise? Let's understand the related terms one-by-one and get to the crux of the debate to differentiate better! Migration to Cloud is the process of migrating data, applications, or other business elements to the cloud environment. This involves transferring the data from the local data center to public cloud storage. Migration can also be from one cloud platform to another. This type is called cloud-to-cloud migration. Reverse Cloud Migration is a process where cloud repartition is done. Here, the data is moved from the cloud storage to a local data center.
Benefits of Cloud MigrationThere are various reasons why an organization would choose to migrate its data or application to the cloud platform. Some of them are mentioned below:
- Ability to host applications in the most effective environment possible
- Self-service capability
- Pay-per-use model
Lift and Shift ProcessLift-and-shift, aka Rehosting method of Migration, is a process where a direct port is enabled from the application with very little code modification. For most organizations, the idea of new development based on cloud-native capabilities sounds great, But the problem arises for the larger legacy level migration cases. Rehosting becomes the main choice for an organization wanting to be scaled in terms of migration as fast as possible to meet with a business case. Debating 'Refactor vs Lift and Shift' again, right?
Rehosting can save up to 30-40 percent of migration cost when compared to other methods in legacy migration scenarios.
Several tools are available such as AWS VM Import/Export, Raceml, etc., which allow the Rehosting to be automated. Many organizations prefer to undergo Rehosting manually to gain the experience of applying their legacy systems to the new cloud platforms. If the applications are already running on the cloud, then it is much easier to optimize them. The main part of the process being Migrating the application, data, and service finishes quickly, and now the organization has developed the skills to re-architect the application by now.
Refactoring ProcessAnother approach to the process of Migration of applications to cloud infrastructure is the Refactoring. Here, the architecture of the application is re-imagined to meet the needs of the business case. We take a different perspective on the application's architecture and development basis, mainly using the cloud-native features. This 'Refactor vs Lift and Shift' debate won't end that easily. If there is an urgent need to add features, performance increase, or scalability, we try to Refactor the application knowing that these are difficult to achieve in the existing application’s environment. This is actually a costly pattern and requires a good product-market fit to be beneficial.
Refactor involves a more advanced process of rearchitecting and often recoding some portion of an existing application to take advantage of cloud-native frameworks and functionality. Source: "The Best Cloud Migration Path", ForbesTo simply put it, Refactoring is the method of customizing any application to run on a cloud infrastructure platform. A Partial Refactor is where we only modify specific portions of the application to gain the advantages of the cloud platform. A Complete Refactor changes almost all parts of the application. Time to differentiate them all now!
Refactor vs Lift and Shift: Understanding the DifferenceHave a look at the table below, depicting the Pros and Cons of the discussed cloud migration processes above.
|Lift and Shift||Partial Refactor||Complete Refactor|
|Faster migration and deployment speed||Faster migration than the Complete Refactor method.||Higher performance|
|Very Less work needed to move the application to cloud Infrastructure||Takes advantage of some of the features of the cloud||High level of optimization|
|Does not use the native cloud platform features to its best||Some parts only are changed in the architecture of the application.||Way slower time of deployment and migration|
|Much more expensive to be operated on the cloud||Costly while being used on a cloud platform||Quite more expensive than the previous methods|
Is Container a better option?There are various options for the Migration process that any organization can opt for. Still, we also have containers for the migration of existing or new cloud applications and development. This is not a new topic as containers have been used for years to attain abstraction, compartmentalizing systems. They have been used to move applications and data between platforms and also cloud-to-cloud. Any thoughts on the 'Refactor vs Lift and Shift vs Containers' debate? Some of the most known once are CoreOS, container cluster managers, and Docker. To recap, the Linux kernel is a container without needing to start a virtual machine providing resource isolation. Similarly, Docker has a common container format, Linux Containers (LXC) provides a high-level API for a lightweight virtualized solution running process in isolation. Key Features of Containers:
- Reduced Complexity by using container abstractions.
- Maximize the value of containers by increasing portability and interim automation being leveraged.
- Better Security and governance
- Better distributed computing capability, as divisions of applications, reside within containers.