Microservices for Java Developers, 2nd Edition

Chapter 8. Where Do We Go from Here?

We have covered a lot in this report, but we certainly didn’t cover everything! Keep in mind we are just scratching the surface here, and there are many more things to consider in a microservices environment than what we could explore in this report. In this final chapter, we’ll very briefly talk about a couple of additional concepts you should be aware of. We’ll leave it as an exercise for the reader to dig into more detail for each section!

Configuration

Configuration is a very important part of any distributed system, and it becomes even more difficult with microservices. We need to find a good balance between configuration and immutable delivery because we don’t want to end up with snowflake services. For example, we’ll need to be able to change logging, switch on features for A/B testing, configure database connections, and use secret keys or passwords. We saw in some of our examples how to configure our microservices using each of the three Java frameworks presented here, but each framework does configuration slightly differently. What if we have microservices written in Python, Scala, Golang, Node.js, etc.?

To be able to manage configuration across technologies and within containers, we need to adopt an approach that works regardless of what’s actually running in the containers. In a Docker environment, we can inject environment variables and allow our application to consume those environment variables. Kubernetes allows us to do that ...