- Image contains all the additional file changes required to run your
application. This is likely a union of your os files + your application files.
- Docker Daemon
- Docker Client
- Docker Hub
Docker uses Copy on Write and union file system to optimize resource usage.
It uses Overlayfs filesystem architecture as one of the storage driver
to manage file changes.
Docker Compose is a tool with which you can define multiple containers
that your application needs and launch all of them with one command.
For example, if your application has a HTTP Server, SQL Database, and a logging
framework, you can define all of them in separate containers and launch them
using Docker Compose.