In this chapter, we introduced the concepts of version control, and the essentials of Git in particular. We set up a new Git repo, created a GitHub account, pushed our code to it, and cloned it on a node. We wrote a shell script to automatically pull and apply changes from the GitHub repo on any node, and a Puppet manifest to install this script and run it regularly from cron.

In the next chapter, we'll explore the power of Puppet resources, going into more detail about the Puppet file, package, and service resources we've already encountered, and introducing three more important resource types: user, cron, and exec.