Running Docker on Fedora 31 - revert systemd configuration to use cgroup v1

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Fedora 31 is first major distro with cgroup v2 (unified hierarchy). Follow below steps to make Docker working on it:

Add Docker CE repository:

sudo dnf config-manager --add-repo

Install Docker CE:

sudo dnf install docker-ce

When you try to run Docker container on freshly installed Fedora 31, you will get following error message:

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.

Revert the systemd configuration to use cgroup v1, edit default Grub config file:

sudo gedit /etc/default/grub

Append line starting with GRUB_CMDLINE_LINUX with systemd.unified_cgroup_hierarchy=0 parameter.

After that rebuild Grub config and then reboot.

grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg