I don't understand your question. Docker was always supported on Fedora. I use docker everyday. It works fine without any issues.
The third paragraph only Fedora 28 and 29 are supported. I tried with 30 but you had to go through the unstable channel to get anything and I wasn't willing to do it to develop.
I already had docker installed and I upgraded to Fedora 30. So docker still works fine. I do need to check the PPA situation. I think maybe it's just that they haven't updated the PPA for docker yet. I see this issue github.com/docker/for-linux/issues...
Anyway, for me, it's not a big deal to use repo for 29 or test repo but if you find it a problem may be better to stay on Fedora 29 until 30 is stable and all repo is available
Yes, that's what I do. It's only docker not being supported on 30 that "holds me back". 29 being an LTS is good until then.
Btw did you try sudo dnf install --releasever=29 docker-ce docker-ce-cli containerd.io
sudo dnf install --releasever=29 docker-ce docker-ce-cli containerd.io
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