Container
Overview
A restricted runtime environment for a set of processes as a lighter-weight alternative, called operating system level virtualization, to the virtual machine for the services isolation purpose.
It's possible to create containers manually, although tools, like docker and LXC, exist for tasks of creating and managing containers effectively.
Docker
History
The first versions of Docker were built on LXC.
Overlay Filesystems
The Linux kernel module OverlayFS layers two directories on a single Linux host and presents them as a single directory.
In rootless mode, Podman uses the FUSE version of the overlay filesystem.
Networking
Docker first creates a new network interface (usually docker0) on the host.
When a container is created, Docker will create a virtual interface, as a link between two network interfaces one of which lies in the new namespace, on the host.
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