121 lines
4.6 KiB
Markdown
121 lines
4.6 KiB
Markdown
<!-- [metadata]>
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+++
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aliases = ["/engine/misc/"]
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title = "Docker Engine"
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description = "Engine"
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keywords = ["Engine"]
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[menu.main]
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identifier="engine_use"
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weight=-85
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+++
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<![end-metadata]-->
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# About Docker Engine
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**Develop, Ship and Run Any Application, Anywhere**
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[**Docker**](https://www.docker.com) is a platform for developers and sysadmins
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to develop, ship, and run applications. Docker lets you quickly assemble
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applications from components and eliminates the friction that can come when
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shipping code. Docker lets you get your code tested and deployed into production
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as fast as possible.
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Docker consists of:
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* The Docker Engine - our lightweight and powerful open source containerization
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technology combined with a work flow for building and containerizing your
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applications.
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* [Docker Hub](https://hub.docker.com) - our SaaS service for
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sharing and managing your application stacks.
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## Why Docker?
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*Faster delivery of your applications*
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* We want your environment to work better. Docker containers,
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and the work flow that comes with them, help your developers,
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sysadmins, QA folks, and release engineers work together to get your code
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into production and make it useful. We've created a standard
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container format that lets developers care about their applications
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inside containers while sysadmins and operators can work on running the
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container in your deployment. This separation of duties streamlines and
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simplifies the management and deployment of code.
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* We make it easy to build new containers, enable rapid iteration of
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your applications, and increase the visibility of changes. This
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helps everyone in your organization understand how an application works
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and how it is built.
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* Docker containers are lightweight and fast! Containers have
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sub-second launch times, reducing the cycle
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time of development, testing, and deployment.
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*Deploy and scale more easily*
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* Docker containers run (almost) everywhere. You can deploy
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containers on desktops, physical servers, virtual machines, into
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data centers, and up to public and private clouds.
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* Since Docker runs on so many platforms, it's easy to move your
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applications around. You can easily move an application from a
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testing environment into the cloud and back whenever you need.
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* Docker's lightweight containers also make scaling up and
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down fast and easy. You can quickly launch more containers when
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needed and then shut them down easily when they're no longer needed.
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*Get higher density and run more workloads*
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* Docker containers don't need a hypervisor, so you can pack more of
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them onto your hosts. This means you get more value out of every
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server and can potentially reduce what you spend on equipment and
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licenses.
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*Faster deployment makes for easier management*
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* As Docker speeds up your work flow, it gets easier to make lots
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of small changes instead of huge, big bang updates. Smaller
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changes mean reduced risk and more uptime.
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## About this guide
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The [Understanding Docker section](understanding-docker.md) will help you:
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- See how Docker works at a high level
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- Understand the architecture of Docker
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- Discover Docker's features;
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- See how Docker compares to virtual machines
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- See some common use cases.
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### Installation guides
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The [installation section](installation/index.md) will show you how to install Docker
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on a variety of platforms.
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### Docker user guide
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To learn about Docker in more detail and to answer questions about usage and
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implementation, check out the [Docker User Guide](userguide/index.md).
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## Release notes
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A summary of the changes in each release in the current series can now be found
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on the separate [Release Notes page](https://docs.docker.com/release-notes)
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## Feature Deprecation Policy
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As changes are made to Docker there may be times when existing features
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will need to be removed or replaced with newer features. Before an existing
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feature is removed it will be labeled as "deprecated" within the documentation
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and will remain in Docker for, usually, at least 2 releases. After that time
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it may be removed.
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Users are expected to take note of the list of deprecated features each
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release and plan their migration away from those features, and (if applicable)
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towards the replacement features as soon as possible.
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The complete list of deprecated features can be found on the
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[Deprecated Features page](deprecated.md).
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## Licensing
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Docker is licensed under the Apache License, Version 2.0. See
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[LICENSE](https://github.com/docker/docker/blob/master/LICENSE) for the full
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license text.
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