Docker for Rails Developers

What Is Docker?

Docker, the technology, is a set of tools built around the idea of packaging and running software in small, sandboxed environments known as containers (we’ll get to the nitty gritty of these in ​What Is a Container?​).

At a high level, Docker provides five capabilities:

• Packaging. The ability to package software into a reusable, shareable format known as images.

• Distribution. The ability to easily share packaged software (images) with other people and deploy it to different machines.

• Runtime. The ability to run, pause, restart, or stop packaged software in a reliable, repeatable way.

• Infrastructure creation. Creating virtual machines ready to run our Docker containers.

• Orchestration and scaling. Managing the release of software ...