In my consulting work, I bump into a lot of engineering teams that are migrating from a monolithic application to a microservices-based application. “So what?” you may say, “and the sky is blue,” and yes, while I understand that this migration pattern is almost becoming a cliche, there are often aspects of a migration get forgotten. I’m keen to talk about one of these topics today — the role of an edge gateway, or API gateway.
Migrating to Microservices
Typically at the start of a migration the obvious topics are given plenty of attention: domain modelling via defining Domain-Driven Design inspired “bounded contexts,” the creation of continuous delivery pipelines, automated infrastructure provisioning, enhanced monitoring and logging, and sprinkling in some shiny new technology (Docker, Kubernetes, and perhaps currently a service mesh or two?). However, the less obvious aspects can cause a lot of pain if they are ignored. A case in point is how to orchestrate the evolution of the system and the migration of the existing user traffic. Although you want to refactor the existing application architecture and potentially bring in some new technology, you do not want to disrupt your end users.
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