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Fixed the actual download address of the packages. #223

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fix #213

@tao12345666333
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@thaJeztah PATL, thanks!

Before the modification, only the mirror was used to download the yum repo file, but the download of the rpm package was still through download.docker.com.

Comment on lines +457 to +466
if [ -n "$mirror" ]; then
case "$mirror" in
Aliyun)
sed -i "s#download.docker.com#mirrors.aliyun.com/docker-ce#g" /etc/yum.repos.d/docker-ce.repo
;;
AzureChinaCloud)
sed -i "s#download.docker.com#mirror.azure.cn/docker-ce#g" /etc/yum.repos.d/docker-ce.repo
;;
esac
fi
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Looks like the indentation is using spaces instead of tabs here.

Also wondering if we should repeat the case here, or if we should (e.g.) add a RPM_REPO_URL variable to the existing code higher up;

case "$mirror" in
Aliyun)
DOWNLOAD_URL="https://mirrors.aliyun.com/docker-ce"
;;
AzureChinaCloud)
DOWNLOAD_URL="https://mirror.azure.cn/docker-ce"
;;
esac
(or even re-use DOWNLOAD_URL to always update the docker-ce.repo URL?

And if that variable is set to do the replace.

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More in general though, I'm a bit unsure if we should keep these mirror options; are they still useful? I recall that support for our CDN's has improved behind the GFW, so perhaps it's no longer needed for "most" situations.

Looking at the mirrors, is the aliyun mirror still operational?

There's also the rootless-install script; which has the URLs hard-coded; https://github.com/docker/docker-install/blob/6580690119f66d3e31b8bc84e7ac9f9e3d68559b/rootless-install.sh

Which adds a bit to my concern if adding extra complexity is worth it, or if we should remove it altogether.

We already have the DOWNLOAD_URL variable (and/or RPM_REPO_URL); if we added the replace for docker-ce.repo, we could remove the switch for these specific mirrors

Will have to check with others what's the desired approach

@wojiushixiaobai
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Thank you very much. At present, CDN can work normally in some unrestricted areas, http://pub.mirrors.aliyun.com/docker-ce/ Services are no longer available

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What should domestic users do when using get-docker.sh to install docker-ce timeout?
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