mirror of
https://github.com/moby/moby.git
synced 2022-11-09 12:21:53 -05:00
8fee1c2020
GitHub flavored markdown is now supported for links and images. Also, ran LinkChecker and FileResolver. Yay! Fixes from Spider check Output for docker/docker now goes into engine directory Signed-off-by: Mary Anthony <mary@docker.com>
70 lines
3 KiB
Markdown
70 lines
3 KiB
Markdown
<!--[metadata]>
|
|
+++
|
|
title = "Create a base image"
|
|
description = "How to create base images"
|
|
keywords = ["Examples, Usage, base image, docker, documentation, examples"]
|
|
[menu.main]
|
|
parent = "smn_images"
|
|
+++
|
|
<![end-metadata]-->
|
|
|
|
# Create a base image
|
|
|
|
So you want to create your own [*Base Image*](../reference/glossary.md#base-image)? Great!
|
|
|
|
The specific process will depend heavily on the Linux distribution you
|
|
want to package. We have some examples below, and you are encouraged to
|
|
submit pull requests to contribute new ones.
|
|
|
|
## Create a full image using tar
|
|
|
|
In general, you'll want to start with a working machine that is running
|
|
the distribution you'd like to package as a base image, though that is
|
|
not required for some tools like Debian's
|
|
[Debootstrap](https://wiki.debian.org/Debootstrap), which you can also
|
|
use to build Ubuntu images.
|
|
|
|
It can be as simple as this to create an Ubuntu base image:
|
|
|
|
$ sudo debootstrap raring raring > /dev/null
|
|
$ sudo tar -C raring -c . | docker import - raring
|
|
a29c15f1bf7a
|
|
$ docker run raring cat /etc/lsb-release
|
|
DISTRIB_ID=Ubuntu
|
|
DISTRIB_RELEASE=13.04
|
|
DISTRIB_CODENAME=raring
|
|
DISTRIB_DESCRIPTION="Ubuntu 13.04"
|
|
|
|
There are more example scripts for creating base images in the Docker
|
|
GitHub Repo:
|
|
|
|
- [BusyBox](https://github.com/docker/docker/blob/master/contrib/mkimage-busybox.sh)
|
|
- CentOS / Scientific Linux CERN (SLC) [on Debian/Ubuntu](
|
|
https://github.com/docker/docker/blob/master/contrib/mkimage-rinse.sh) or
|
|
[on CentOS/RHEL/SLC/etc.](
|
|
https://github.com/docker/docker/blob/master/contrib/mkimage-yum.sh)
|
|
- [Debian / Ubuntu](
|
|
https://github.com/docker/docker/blob/master/contrib/mkimage-debootstrap.sh)
|
|
|
|
## Creating a simple base image using scratch
|
|
|
|
You can use Docker's reserved, minimal image, `scratch`, as a starting point for building containers. Using the `scratch` "image" signals to the build process that you want the next command in the `Dockerfile` to be the first filesystem layer in your image.
|
|
|
|
While `scratch` appears in Docker's repository on the hub, you can't pull it, run it, or tag any image with the name `scratch`. Instead, you can refer to it in your `Dockerfile`. For example, to create a minimal container using `scratch`:
|
|
|
|
FROM scratch
|
|
ADD hello /
|
|
CMD ["/hello"]
|
|
|
|
This example creates the hello-world image used in the tutorials.
|
|
If you want to test it out, you can clone [the image repo](https://github.com/docker-library/hello-world)
|
|
|
|
|
|
## More resources
|
|
|
|
There are lots more resources available to help you write your 'Dockerfile`.
|
|
|
|
* There's a [complete guide to all the instructions](../reference/builder.md) available for use in a `Dockerfile` in the reference section.
|
|
* To help you write a clear, readable, maintainable `Dockerfile`, we've also
|
|
written a [`Dockerfile` Best Practices guide](dockerfile_best-practices.md).
|
|
* If your goal is to create a new Official Repository, be sure to read up on Docker's [Official Repositories](https://docs.docker.com/docker-hub/official_repos/).
|