This image serves as the semi-official Fedora image (will be updated by a more up to date version along with fedora rel-eng approval to make it fully official).
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The fedora:latest tag will always point to the latest stable release (which
is, at the time of this writing, fedora:20). The stable release is also tagged
with the release code name (fedora:heisenbug). Fedora 21 and later won't have
a release code name.
The fedora:rawhide tag will always point to the rawhide branch.
The metalink http://mirrors.fedoraproject.org is used to automatically select
a mirror site (both for building the image as well as for the yum repos in the
container image).
$ docker run fedora:20 cat /etc/yum.repos.d/fedora.repo | grep metalink
metalink=https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch
metalink=https://mirrors.fedoraproject.org/metalink?repo=fedora-debug-$releasever&arch=$basearch
metalink=https://mirrors.fedoraproject.org/metalink?repo=fedora-source-$releasever&arch=$basearch