Explore microservices in-depth and understand when to use them.

Scalability & System Design for Developers

In this module, we’ll explore microservices in depth and understand when to use them. Beyond that, learn about micro and macro architecture, strategies for migrating old systems, the role of Docker in this architecture, and technologies for implementing microservices.

An Introduction to Microservice Principles and Concepts

# Chapter walkthrough
This chapter introduces Docker and covers the following:

* After studying the chapter, the reader is able to **run the examples
provided** in the following chapters **in a Docker environment**.

* Docker and microservices are nearly synonymous. This chapter **explains why Docker fits so well with microservices**.

* Docker facilitates software installation. Important for this is the `Dockerfile`, which describes the installation of the software in a
simple way.

* Docker Machine and Docker Compose support Docker on server systems and complex software environments with Docker.

* The chapter lays the foundation for an understanding of technologies such as **Kubernetes** **Cloud
Foundry**, which are based on Docker.


# Licences and projects

Docker is under the Apache 2.0 license. It is developed by the company
[Docker, Inc.](https://www.docker.com/), among others. 

Some core components, such as [Moby](https://github.com/moby/moby), for example, are under an Open Source license and allow other developers to implement systems similar to Docker. 

Docker is based on Linux containers, which isolate processes in Linux systems from each other. The [Open Container Initiative](https://www.opencontainers.org/) ensures
via standardization of the compatibility of the different container systems.


In this lesson, we'll walk through what we will learn in this chapter.