Docker is a set of tools, that make it easier to work with some features of the Linux kernel. These kernel features allow several degrees of separating different processes from each other. For example, by default each Docker container you run will see its own file system, unable to interact (read: mess) with the original file system on the host or other Docker container. Each Docker container is in the end a single executable with all its dependencies bundled in an archive file, plus some Docker-related metadata.

I was in the same boat. Years at Contabo, until they became dogshit and then moved to Netcup. No problems with them so far.

config.sys and autoexec.bat gang.

I passed the day that was farther away from my birthday than my birthday was to the start of WW2 years ago.