为什么"https://get.docker.com/ubuntu"是一个apt存储库？

Question

今天我按照以下说明成功升级了 docker:https://askubuntu.com/questions/472412/how-do-i-upgrade-docker.

但是,当我在浏览器中打开存储库url https://get.docker.com/ubuntu/时,它只是一个文本页面,其中包含一个列表bash commands.

我的问题是:

• 这个文本页面的URL如何适用？

• apt只是运行bash命令吗？

• 如果是这样,为什么有相同的命令:

" echo deb https://get.docker.com/ubuntu docker main > /etc/apt/sources.list.d/docker.list"

在 https://askubuntu.com/questions/472412/how-do-i-upgrade-docker中

Answer 1

位于https://get.docker.com/ubuntu/的页面包含可用于安装docker的脚本

# Check that HTTPS transport is available to APT
if [ ! -e /usr/lib/apt/methods/https ]; then
    apt-get update
    apt-get install -y apt-transport-https
fi

# Add the repository to your APT sources
echo deb https://get.docker.com/ubuntu docker main > /etc/apt/sources.list.d/docker.list

# Then import the repository key
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9

# Install docker
apt-get update
apt-get install -y lxc-docker

但是这个脚本没有被使用apt-get,必须手动运行.

该脚本/etc/apt/sources.list.d/docker.list使用以下内容创建配置文件:

deb https://get.docker.com/ubuntu docker main

当apt-get update运行时,此配置文件将被使用,apt-get update将采取该行,并从它建立了以下网址

https://get.docker.com/ubuntu/dists/docker/main/binary-amd64/Packages

包管理系统的包缓存将使用Packages文件中描述的包进行更新.

Package: lxc-docker
Version: 1.5.0
License: Apache-2.0
Vendor: none
Architecture: amd64
Maintainer: support@docker.com
Installed-Size: 0
Depends: lxc-docker-1.5.0
Homepage: http://www.docker.com/
Priority: extra
Section: default
Filename: pool/main/l/lxc-docker/lxc-docker_1.5.0_amd64.deb
Size: 2092
SHA256: 2e8b061216cc45343197e52082175bc671af298d530652436dc16d0397f986f0
SHA1: 24a0314bd7f6fdf79b69720de60be77510d689af
MD5sum: 923cad1a2af2d6b0a3e8fa909ba26ca4
Description: Linux container runtime Docker complements LXC with a high-level API which operates at the process level. It runs unix processes with strong guarantees of isolation and repeatability across servers. Docker is a great building block for automating distributed systems: large-scale web deployments, database clusters, continuous deployment systems, private PaaS, service-oriented architectures, etc.
....

最后apt-get upgrade将下载并安装软件包.