In this chapter, you learned how to create Node servers and applications, both locally and in the cloud. Having deployed a simple document-editing application using Node and MongoDB across three different PaaS providers, you have an early sense of what is available to the Node developer who is looking to scale their application. You were introduced to Docker, which offers a powerful new containerization technology, allowing us to make many cheap clones of our applications; wherever there is Linux, there exists a deploy target for Docker.

In the next chapter, we will take these simple ideas about scaling farther and deeper by exploring in more detail how Node can be scaled both vertically and horizontally—across cores and across many machines.