What are microservices?

It comes when an application is broken down into smaller, composable pieces which work together.

Monolithic App.

Microservices are a contrast to a traditional, "monolithic" application which is all developed all in one piece.

Monolithic → Microservices

Advantages

Agility and productivity:

Teams can build, deploy, and test it independently of other components in much faster iteration cycles.

Scalability:

The microservices development team can scale the component at run time independently of other microservice components

Monolithic

Microservices

Resilience:

The separate run time immediately provides resilience that is independent of failures in other components.

Drawbacks

Complexity:

Requires big knowledge in architecture patterns to build and connect everything in the right place.

Over-Design:

Sometimes is difficult to define exactly what a microservice means in terms of bussiness logic or functionality.

Integration Testing:

When it comes to test the scenario of all the services working together it can be a situation a little bit difficult to handle.

Why docker?

How are they related?

Are containers microservices? 

Build, deploy and scale applications faster.