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followup to incorporate review comments per previous reviews on PR#29561

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incorporated review comments

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
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Victoria Bialas 2016-12-20 17:45:32 -08:00
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@ -62,6 +62,28 @@ be done to get it running.
*Also known as : docker-compose, fig* *Also known as : docker-compose, fig*
## copy-on-write
Docker uses a
[copy-on-write](https://docs.docker.com/engine/userguide/storagedriver/imagesandcontainers/#/the-copy-on-write-strategy)
technique and a [union file system](#union-file-system) for both images and
containers to optimize resources and speed performance. Multiple copies of an
entity share the same instance and each one makes only specific changes to its
unique layer.
Multiple containers can share access to the same image, and make
container-specific changes on a writable layer which is deleted when
the container is removed. This speeds up container start times and performance.
Images are essentially layers of filesystems typically predicated on a base
image under a writable layer, and built up with layers of differences from the
base image. This minimizes the footprint of the image and enables shared
development.
For more about copy-on-write in the context of Docker, see [Understand images,
containers, and storage
drivers](https://docs.docker.com/engine/userguide/storagedriver/imagesandcontainers/).
## container ## container
A container is a runtime instance of a [docker image](#image). A container is a runtime instance of a [docker image](#image).
@ -100,19 +122,21 @@ lightweight Docker development environment designed specifically for the Mac. A
native Mac application, Docker for Mac uses the macOS Hypervisor framework, native Mac application, Docker for Mac uses the macOS Hypervisor framework,
networking, and filesystem. It's the best solution if you want to build, debug, networking, and filesystem. It's the best solution if you want to build, debug,
test, package, and ship Dockerized applications on a Mac. Docker for Mac test, package, and ship Dockerized applications on a Mac. Docker for Mac
supersedes [Docker Toolbox](#toolbox) as state-of-the-art Docker for macOS. supersedes [Docker Toolbox](#toolbox) as state-of-the-art Docker on macOS.
## Docker for Windows ## Docker for Windows
[Docker for Windows](https://docs.docker.com/docker-for-windows/) is an [Docker for Windows](https://docs.docker.com/docker-for-windows/) is an
easy-to-install, lightweight Docker development environment designed easy-to-install, lightweight Docker development environment designed
specifically for Windows systems. Docker for Windows uses Microsoft Hyper-V, and specifically for Windows 10 systems that support Microsoft Hyper-V
runs as a native Windows app. It works with Windows Server 2016, and gives you (Professional, Enterprise and Education). Docker for Windows uses Hyper-V for
the ability to set up and run Windows containers as well as the standard Linux virtualization, and runs as a native Windows app. It works with Windows Server
containers (with an option to switch between the two). Docker for Windows is the 2016, and gives you the ability to set up and run Windows containers as well as
best solution if you want to build, debug, test, package, and ship Dockerized the standard Linux containers, with an option to switch between the two. Docker
applications on Windows machines. It supersedes [Docker Toolbox](#toolbox) as for Windows is the best solution if you want to build, debug, test, package, and
state-of-the-art Docker on Windows. ship Dockerized applications from Windows machines. Docker for Windows
supersedes [Docker Toolbox](#toolbox) as state-of-the-art Docker on Windows.
## Docker Hub ## Docker Hub
@ -296,13 +320,25 @@ For Windows 10 systems that support Microsoft Hyper-V (Professional, Enterprise
and Education), [Docker for and Education), [Docker for
Windows](https://docs.docker.com/docker-for-windows/) is the better solution. Windows](https://docs.docker.com/docker-for-windows/) is the better solution.
## Union file system ## Union file system
Union file systems, or UnionFS, are file systems that operate by creating Union file systems implement a [union
layers, making them very lightweight and fast. Docker uses union file systems to mount](https://en.wikipedia.org/wiki/Union_mount) and operate by creating
provide the building blocks for containers. layers. Docker uses union file systems in conjunction with
[copy-on-write](#copy-on-write) techniques to provide the building blocks for
containers, making them very lightweight and fast.
For more on Docker and union file systems, see [Docker and AUFS in
practice](https://docs.docker.com/engine/userguide/storagedriver/aufs-driver/),
[Docker and Btrfs in
practice](https://docs.docker.com/engine/userguide/storagedriver/btrfs-driver/),
and [Docker and OverlayFS in
practice](https://docs.docker.com/engine/userguide/storagedriver/overlayfs-driver/)
Example implementations of union file systems are
[UnionFS](https://en.wikipedia.org/wiki/UnionFS),
[AUFS](https://en.wikipedia.org/wiki/Aufs), and
[Btrfs](https://btrfs.wiki.kernel.org/index.php/Main_Page).
## virtual machine ## virtual machine