Docker is a set of platform as a service products that use OS-level virtualization to deliver software in packages called containers. Containers are isolated from one another and bundle their own software, libraries and configuration files; they can communicate with each other through well-defined channels.
Setting up Pihole on your Synology NAS
If you ever wanted to have your own DNS Sinkhole and you have a Synology NAS this guide will let you setup one quickly