The Migration of Legacy Applications to Workers

As Cloudflare Workers, and other Serverless platforms, continue to drive down costs while making it easier for developers to stand up globally scaled applications, the migration of legacy applications is becoming increasingly common. In this post, I want to show how easy it is to migrate such an application onto Workers. To demonstrate, I’m going to use a common migration scenario: moving a legacy application — on an old compute platform behind a VPN or in a private cloud — to a serverless compute platform behind zero-trust security.

Wait but why?

Before we dive further into the technical work, however, let me just address up front: why would someone want to do this? What benefits would they get from such a migration? In my experience, there are two sets of reasons: (1) factors that are “pushing” off legacy platforms, or the constraints and problems of the legacy approach; and (2) factors that are “pulling” onto serverless platforms like Workers, which speaks to the many benefits of this new approach. In terms of the push factors, we often see three core ones:

• Legacy compute resources are not flexible and must be constantly maintained, often leading to capacity constraints or excess cost;
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Bandwidth Alliance Partners – Exciting Choices

We are tremendously excited about the value our Bandwidth Alliance partner ecosystem adds to our customers. We’re on a mission to help make the internet a better place; and ensuring everyone can access cloud resources at zero-egress rates supports that mission in many ways. It’s an easy way for our clients to build modern, cloud-centric applications without the design constraint and financial burden of egress fees.

The cloudflare bandwidth alliance partner landscape continues to grow, and incorporate a diverse group of partners, with today’s second wave announcement.  With over a dozen different partners, the range of choices can quickly become overwhelming. And, while these are all high-quality platforms which we are happy to recommend to our clients - their important differences will help determine the best fit for you, the customer.

In this post, I’ll lay out some of Cloudflare’s approach to this solution design question through the lens of a large client we recently worked with. We apply this approach across our full range of products and services, including many use cases far different from the Storage need we’ll dig into in this post. I hope that this can help all of our clients, or anyone else interested, mirror Continue reading