added docker glossary entry (#7470)

* added docker glossay entry

Signed-off-by: Jeffrey Borek <jborek@us.ibm.com>

* Update docker.yaml
pull/7210/merge
Jeffrey Borek 2018-02-20 18:51:40 -08:00 committed by k8s-ci-robot
parent f6792cf9f8
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id: docker
name: docker
full-link: /docs/reference/kubectl/docker-cli-to-kubectl/
tags:
- fundamental
short-description: >
Docker is a software technology providing operating-system-level virtualization also known as containers.
long-description: >
Docker uses the resource isolation features of the Linux kernel such as cgroups and kernel namespaces, and a union-capable file system such as OverlayFS and others to allow independent "containers" to run within a single Linux instance, avoiding the overhead of starting and maintaining virtual machines (VMs).