Docker is an open platform for building, shipping and running distributed applications. It gives programmers, development teams and operations engineers the common toolbox they need to take advantage of the distributed and networked nature of modern applications.


Docker Containers vs Virtual Hypervisor Model 1

In the Docker container model, the Docker engine sits atop a single host operating system. In contrast, with the traditional virtualization hypervisor mode, a separate guest operating system is required for each virtual machine.

Docker Images and Docker Containers 2

Docker Images 3

A Docker image is a read-only template.
For example, an image could contain an Ubuntu operating system with Apache and your web application installed. Images are used to create Docker containers.
Docker provides a simple way to build new images or update existing images, or you can download Docker images that other people have already created.

Docker images are the build component of Docker.

# list all images
docker images

Docker Containers 4

Docker containers are similar to a directory. A Docker container holds everything that is needed for an application to run.
Each container is created from a Docker image. Docker containers can be run, started, stopped, moved, and deleted.
Each container is an isolated and secure application platform.

Docker containers are the run component of Docker.


Docker only supports CentOS 7, Windows 7.1, 8/8.1, Mac OSX 10.8 64bit



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