What to Know Before Migrating Legacy, Monolithic, or Existing Applications to Microservices

The text discusses legacy code, monolithic applications, microservices, their benefits and disadvantages. It also provides criteria for evaluating whether to use microservices or monolithic architecture, migration strategies from monolithic systems to microservices, and tips on getting the most out of a microservices architecture. The text emphasizes that while microservices can offer scalability, autonomy, fault tolerance, and quicker onboarding, they also introduce complexity, harder debugging and testing, and latency issues. It suggests considering factors such as whether services will be created or maintained by another team, use a different programming language, need to stay up if other functionality in the system goes down, or need to be scaled independently of other parts of the system before deciding on microservices. The text also provides two common migration strategies: the strangler pattern and domain-driven design. It suggests using continuous integration and continuous delivery processes for automation during software delivery pipeline and advises against starting with a microservices architecture from the outset, especially when working with a legacy or existing application.