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Add Glossary to documentation
Closes #11057 Signed-off-by: Ankush Agarwal <ankushagarwal11@gmail.com>
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Ankush Agarwal
Tibor Vass
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page_title: Docker Glossary
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page_description: Glossary of terms used around Docker
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page_keywords: glossary, docker, terms, definitions
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# Glossary
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A list of terms used around the Docker project.
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## aufs
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aufs (advanced multi layered unification filesystem) is a Linux [filesystem](#filesystem) that
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Docker supports as a storage backend. It implements the
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[union mount](http://en.wikipedia.org/wiki/Union_mount) for Linux file systems.
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## boot2docker
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[boot2docker](http://boot2docker.io/) is a lightweight Linux distribution made
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specifically to run Docker containers. It is a common choice for a [VM](#virtual-machine)
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to run Docker on Windows and Mac OS X.
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boot2docker can also refer to the boot2docker management tool on Windows and
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Mac OS X which manages the boot2docker VM.
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## btrfs
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btrfs (B-tree file system) is a Linux [filesystem](#filesystem) that Docker
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supports as a storage backend. It is a [copy-on-write](http://en.wikipedia.org/wiki/Copy-on-write)
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filesystem.
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## build
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build is the process of building Docker images using a [Dockerfile](#dockerfile).
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The build uses a Dockerfile and a "context". The context is the set of files in the
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directory in which the image is built.
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## cgroups
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cgroups is a Linux kernel feature that limits, accounts for, and isolates
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the resource usage (CPU, memory, disk I/O, network, etc.) of a collection
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of processes. Docker relies on cgroups to control and isolate resource limits.
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*Also known as : control groups*
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## Compose
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[Compose](https://github.com/docker/compose) is a tool for defining and
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running complex applications with Docker. With compose, you define a
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multi-container application in a single file, then spin your
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application up in a single command which does everything that needs to
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be done to get it running.
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*Also known as : docker-compose, fig*
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## container
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A container is a runtime instance of a [docker image](#image).
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A Docker container consists of
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- A Docker image
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- Execution environment
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- A standard set of instructions
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The concept is borrowed from Shipping Containers, which define a standard to ship
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goods globally. Docker defines a standard to ship software.
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## data volume
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A data volume is a specially-designated directory within one or more containers
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that bypasses the Union File System. Data volumes are designed to persist data,
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independent of the container's life cycle. Docker therefore never automatically
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delete volumes when you remove a container, nor will it "garbage collect"
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volumes that are no longer referenced by a container.
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## Docker
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The term Docker can refer to
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- The Docker project as a whole, which is a platform for developers and sysadmins to
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develop, ship, and run applications
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- The docker daemon process running on the host which manages images and containers
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## Docker Hub
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The [Docker Hub](https://hub.docker.com/) is a centralized resource for working with
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Docker and its components. It provides the following services:
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- Docker image hosting
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- User authentication
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- Automated image builds and work-flow tools such as build triggers and web hooks
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- Integration with GitHub and BitBucket
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## Dockerfile
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A Dockerfile is a text document that contains all the commands you would
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normally execute manually in order to build a Docker image. Docker can
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build images automatically by reading the instructions from a Dockerfile.
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## filesystem
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A file system is the method an operating system uses to name files
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and assign them locations for efficient storage and retrieval.
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Examples :
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- Linux : ext4, aufs, btrfs, zfs
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- Windows : NTFS
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- OS X : HFS+
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## image
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Docker images are the basis of [containers](#container). An Image is an
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ordered collection of root filesystem changes and the corresponding
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execution parameters for use within a container runtime. An image typically
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contains a union of layered filesystems stacked on top of each other. An image
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does not have state and it never changes.
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## libcontainer
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libcontainer provides a native Go implementation for creating containers with
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namespaces, cgroups, capabilities, and filesystem access controls. It allows
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you to manage the lifecycle of the container performing additional operations
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after the container is created.
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## link
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links provide an interface to connect Docker containers running on the same host
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to each other without exposing the hosts' network ports. When you set up a link,
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you create a conduit between a source container and a recipient container.
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The recipient can then access select data about the source. To create a link,
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you can use the `--link` flag.
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## Machine
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[Machine](https://github.com/docker/machine) is a Docker tool which
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makes it really easy to create Docker hosts on your computer, on
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cloud providers and inside your own data center. It creates servers,
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installs Docker on them, then configures the Docker client to talk to them.
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*Also known as : docker-machine*
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## overlay
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OverlayFS is a [filesystem](#filesystem) service for Linux which implements a
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[union mount](http://en.wikipedia.org/wiki/Union_mount) for other file systems.
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It is supported by the Docker daemon as a storage driver.
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## registry
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A Registry is a hosted service containing [repositories](#repository) of [images](#image)
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which responds to the Registry API.
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The default registry can be accessed using a browser at [Docker Hub](#docker-hub)
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or using the `docker search` command.
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## repository
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A repository is a set of Docker images. A repository can be shared by pushing it
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to a [registry](#registry) server. The different images in the repository can be
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labeled using [tags](#tag).
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Here is an example of the shared [nginx repository](https://registry.hub.docker.com/_/nginx/)
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and its [tags](https://registry.hub.docker.com/_/nginx/tags/manage/)
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## Swarm
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[Swarm](https://github.com/docker/swarm) is a native clustering tool for Docker.
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Swarm pools together several Docker hosts and exposes them as a single virtual
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Docker host. It serves the standard Docker API, so any tool that already works
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with Docker can now transparently scale up to multiple hosts.
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*Also known as : docker-swarm*
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## tag
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A tag is a label applied to a Docker image in a [repository](#repository).
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tags are how various images in a repository are distinguished from each other.
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*Note : This label is not related to the key=value labels set for docker daemon*
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## Union file system
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Union file systems, or UnionFS, are file systems that operate by creating layers, making them
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very lightweight and fast. Docker uses union file systems to provide the building
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blocks for containers.
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## Virtual Machine
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A Virtual Machine is a program that emulates a complete computer and imitates dedicated hardware.
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It shares physical hardware resources with other users but isolates the operating system. The
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end user has the same experience on a Virtual Machine as they would have on dedicated hardware.
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Compared to to containers, a Virtual Machine is heavier to run, provides more isolation,
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gets its own set of resources and does minimal sharing.
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*Also known as : VM*
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