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Merge pull request #635 from infosiftr/dind 

Change Docker-in-Docker README perspective
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yosifkit 2016-07-07 11:59:52 -07:00 committed by GitHub
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# What is Docker? # What is Docker in Docker?
Docker is an open-source project that automates the deployment of applications inside software containers, by providing an additional layer of abstraction and automation of operating-system-level virtualization on Linux, Mac OS and Windows. Although running Docker inside Docker is generally not recommended, there are some legitimate use cases, such as development of Docker itself.
*Docker is an open-source project that automates the deployment of applications inside software containers, by providing an additional layer of abstraction and automation of operating-system-level virtualization on Linux, Mac OS and Windows.*
> [wikipedia.org/wiki/Docker_(software)](https://en.wikipedia.org/wiki/Docker_%28software%29) > [wikipedia.org/wiki/Docker_(software)](https://en.wikipedia.org/wiki/Docker_%28software%29)
%%LOGO%% %%LOGO%%
Before running Docker-in-Docker, be sure to read through [Jérôme Petazzoni's excellent blog post on the subject](https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/), where he outlines some of the pros and cons of doing so (and some nasty gotchas you might run into).
If you are still convinced that you need Docker-in-Docker and not just access to a container's host Docker server, then read on.
# How to use this image # How to use this image
[![asciicast](https://asciinema.org/a/24707.png)](https://asciinema.org/a/24707) [![asciicast](https://asciinema.org/a/24707.png)](https://asciinema.org/a/24707)
## start a daemon instance ## Start a daemon instance
```console ```console
$ docker run --privileged --name some-docker -d docker:1.8-dind $ docker run --privileged --name some-docker -d docker:1.8-dind
@ -20,9 +26,7 @@ $ docker run --privileged --name some-docker -d docker:1.8-dind
This image includes `EXPOSE 2375` (the Docker port), so standard container linking will make it automatically available to the linked containers (as the following examples illustrate). This image includes `EXPOSE 2375` (the Docker port), so standard container linking will make it automatically available to the linked containers (as the following examples illustrate).
Before running Docker-in-Docker, be sure to read through [Jérôme Petazzoni's excellent blog post on the subject](https://jpetazzo.github.io/2015/09/03/do-not-use-docker-in-docker-for-ci/), where he outlines some of the pros and cons of doing so (and some nasty gotchas you might run into). ## Connect to it from a second container
## connect to it from a second container
```console ```console
$ docker run --rm --link some-docker:docker docker:1.7 version $ docker run --rm --link some-docker:docker docker:1.7 version
@ -109,7 +113,7 @@ Server:
OS/Arch: linux/amd64 OS/Arch: linux/amd64
``` ```
## custom daemon flags ## Custom daemon flags
```console ```console
$ docker run --privileged --name some-devicemapper-docker -d docker:dind --storage-driver=devicemapper $ docker run --privileged --name some-devicemapper-docker -d docker:dind --storage-driver=devicemapper