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Merge pull request #13016 from alenzen/patch 

improve documentation
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Usha Mandya 2021-06-25 12:07:25 +01:00 committed by GitHub
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develop/develop-images/baseimages.md
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@ -34,17 +34,17 @@ use to build Ubuntu images.
It can be as simple as this to create an Ubuntu parent image:
$ sudo debootstrap xenial xenial > /dev/null
$ sudo tar -C xenial -c . | docker import - xenial
$ sudo debootstrap focal focal > /dev/null
$ sudo tar -C focal -c . | docker import - focal
a29c15f1bf7a
sha256:81ec9a55a92a5618161f68ae691d092bf14d700129093158297b3d01593f4ee3
$ docker run xenial cat /etc/lsb-release
$ docker run focal cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS"
DISTRIB_RELEASE=20.04
DISTRIB_CODENAME=focal
DISTRIB_DESCRIPTION="Ubuntu 20.04 LTS"
There are more example scripts for creating parent images in [the Docker
GitHub repository](https://github.com/docker/docker/blob/master/contrib).
@ -86,11 +86,11 @@ current directory.
> You can use a Docker container to build it:
>
> ```bash
> $ docker run --rm -it -v $PWD:/build ubuntu:16.04
> $ docker run --rm -it -v $PWD:/build ubuntu:20.04
>
> container# apt-get update && apt-get install build-essential
> container# cd /build
> container# gcc -o hello -static -nostartfiles hello.c
> container# gcc -o hello -static hello.c
> ```
To run your new image, use the `docker run` command: