Chapter 12. Bringing It All Together

We’ve covered a fair amount in the previous chapters, from what microservices are to how to define their boundaries, and from integration technology to concerns about security and monitoring. And we even found time to work out how the role of the architect fits in. There is a lot to take in, as although microservices themselves may be small, the breadth and impact of their architecture are not. So here I’ll try to summarize some of the key points covered throughout the book.

Principles of Microservices

We discussed the role that principles can play in Chapter 2. They are statements about how things should be done, and why we think they should be done that way. They help us frame the various decisions we have to make when building our systems. You should absolutely define your own principles, but I thought it worth spelling out what I see as being the key principles for microservice architectures, which you can see summarized in Figure 12-1. These are the principles that will help us create small autonomous services that work well together. We’ve already covered everything here at least once so far, so nothing should be new, but there is value in distilling it down to its core essence.

You can choose to adopt these principles wholesale, or perhaps tweak them to make sense in your own organization. But note the value that comes from using them in combination: the whole should be greater than the sum of the parts. So if you decide to drop one ...

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