We can’t start talking about Docker without actually covering the ideas that make it such a powerful tool. A container, at the most basic level, is an isolated user-space environment for a given discrete set of functionality. In other words, it is a way to modularize a system (or a part of one) into pieces that are much easier to manage and maintain while often also being very resilient to failures.
In practice, this net gain is never free and requires some investment in the adoption and implementation of new tooling (such as Docker), but the change pays heavy dividends to the adopters in a drastic reduction of development, maintenance, and scaling costs over its lifetime.
At this point, you might ask this: ...
