mirror of https://github.com/docker/docs.git
91 lines
3.6 KiB
Markdown
91 lines
3.6 KiB
Markdown
---
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title: Overview of the get started guide
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keywords: docker basics, how to start a docker container, container settings, setup docker, how to setup docker, setting up docker, docker container guide, how to get started with docker
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description: Get started with the Docker basics in this comprehensive overview, You'll learn about containers, images, and how to containerize your first application.
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redirect_from:
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- /engine/getstarted-voting-app/
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- /engine/getstarted-voting-app/cleanup/
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- /engine/getstarted-voting-app/create-swarm/
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- /engine/getstarted-voting-app/customize-app/
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- /engine/getstarted-voting-app/deploy-app/
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- /engine/getstarted-voting-app/node-setup/
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- /engine/getstarted-voting-app/test-drive/
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- /engine/getstarted/step_five/
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- /engine/getstarted/step_four/
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- /engine/quickstart/
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- /engine/tutorials/
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- /engine/tutorials/dockerimages/
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- /engine/tutorials/dockerizing/
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- /engine/tutorials/usingdocker/
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- /engine/userguide/containers/dockerimages/
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- /engine/userguide/dockerimages/
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- /engine/userguide/intro/
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- /get-started/part1/
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- /get-started/part5/
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- /get-started/part6/
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- /getstarted/
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- /getting-started/
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- /learn/
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- /linux/last_page/
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- /linux/started/
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- /linux/step_four/
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- /mac/step_three/
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- /windows/step_two/
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---
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This guide contains step-by-step instructions on how to get started with Docker. This guide shows you how to:
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- Build and run an image as a container.
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- Share images using Docker Hub.
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- Deploy Docker applications using multiple containers with a database.
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- Run applications using Docker Compose.
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## What is a container?
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A container is a sandboxed process running on a host machine that is isolated from all other processes running on that host machine. That isolation leverages [kernel namespaces and cgroups](https://medium.com/@saschagrunert/demystifying-containers-part-i-kernel-space-2c53d6979504),
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features that have been in Linux for a long time. Docker makes these capabilities approachable and easy to use. To summarize, a container:
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- Is a runnable instance of an image. You can create, start, stop, move, or delete a container using the Docker API or CLI.
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- Can be run on local machines, virtual machines, or deployed to the cloud.
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- Is portable (and can be run on any OS).
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- Is isolated from other containers and runs its own software, binaries, configurations, etc.
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If you're familiar with `chroot`, then think of a container as an extended version of `chroot`. The filesystem comes from the image. However, a container adds additional isolation not available when using chroot.
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## What is an image?
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A running container uses an isolated filesystem. This isolated filesystem is provided by an image, and the image must contain everything needed to run an application - all dependencies, configurations, scripts, binaries, etc. The image also contains other configurations for the container, such as environment variables, a default command to run, and other metadata.
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## Next steps
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In this section, you learned about containers and images.
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Next, you'll containerize a simple application and get hands-on with the concepts.
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[Containerize an application](02_our_app.md){: .button .primary-btn}
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