Did you actually try it?
I don’t mean to be mean, but the tutorial appears to be a copy and paste from older versions with only the version number updated to 31 and not taking into consideration that Fedora 31 is using cgroup v2 - which doesn’t work well together with docker.
This article might have the missing steps:
https://medium.com/nttlabs/cgroup-v2-596d035be4d7
Hi Bearny,
Thank you for bringing this to my attention. It was not copy and paste however proper testing was missing. I simply assumed that once the docker service is up and running it all should be ready to go. As it turned out I could not be more wrong.
Once I tried to run container I got an error:
Status: Downloaded newer image for hello-world:latest
docker: Error response from daemon: OCI runtime create failed: container_linux.go:346: starting container process caused "process_linux.go:297: applying cgroup configuration for process caused \"open /sys/fs/cgroup/docker/cpuset.cpus.effective: no such file or directory\"": unknown.
ERRO[0007] error waiting for container: context canceled
Reverting back to cgroup v1 using:
$ sudo dnf install -y grubby
$ sudo grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=0"
$ sudo reboot
alternatively running starting a docker container as:
$ podman run --rm docker.io/library/hello-world
Resolved the cgroup configuration error. The article will be updated shortly.
thank you
Lubos
Hey there, one suggestion for improvement:
grubby --update-kernel=ALL --args=“systemd.unified_cgroup_hierarchy=0” --make-default
“–make-default”
should make the additional kernel arguments update-proof.
Ben
There seem to be something wrong with the docker repo.
I get the following error:
Errors during downloading metadata for repository :
Error: Failed to download metadata for repo ‘download.docker.com_linux_fedora_docker-ce.rep’: Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
https_docs docker com install linux docker-ce fedora works better.