Docker is an open source container platform that uses OS-level virtualization to package your software in units called containers. Containers are isolated from each other and are designed to be easily portable. You can build, run and distribute applications in Docker containers to run on Linux, Windows, Macs and almost anywhere elseāboth on-premises and in the cloud. The Docker environment also includes a container runtime as well as build and image management.
A Docker container image is a lightweight, standalone, executable software package that includes everything needed to run an application: code, runtime, system tools, system libraries and settings. Docker provides a standard format for packaging and porting software, much like ISO containers define a standard for shipping freight.
A containerized application image along with a set of declarative instructions can be passed to Kubernetes to deploy an application. The containerized app instance running on the Kubernetes node derives the container runtime from the Kubernetes node along with compute, network, and storage resources, if needed.
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