Where do we start to secure our hosts? What tools do we need to start with? We will take a look at using Docker Machine in this section and how to ensure the hosts that we are creating are being created in a secure manner. Docker hosts are like the front door of your house, if you don't secure them properly, then anybody can just walk right in. We will also take a look at Security-Enhanced Linux (SELinux) and AppArmor to ensure that you have an extra layer of security on top of the hosts that you are creating. Lastly, we will take a look at some of the operating systems that support and do auto patching of their operating systems when a security vulnerability is discovered.