Understand Docker images, containers, and registries and how they deliver the benefits of immutable infrastructure and software reuse.
Docker started out in 2012 as an open source project, originally named dotcloud, to build single-application Linux containers. Since then, Docker has become an immensely popular development tool, increasingly used as a runtime environment. Few — if any — technologies have caught on with developers as quickly as Docker.
One reason Docker is so popular is that it delivers the promise of “develop once, run anywhere.” Docker offers a simple way to package an application and its runtime dependencies into a single container; it also provides a runtime abstraction that enables the container to run across different versions of the Linux kernel.
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