Docker CE Stable - x86_64 Repo not available : HTTPS Error 404 - Not Found - https://download.docker.com/linux/centos/7Server/x86_64/stable/repodata/repomd.xml

General
6

After adding the repo using
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
edit the local docker-ce.repo file at

/etc/yum.repos.d/docker-ce.repo

change the baseurl for docker-ce-stable to

https://download.docker.com/linux/centos/7/$basearch/stable

Essentially, you are overriding the expanded value of $releasever (in my case resulted in 7.6).

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