Enabling Docker in Fedora 31 by reverting to cgroups v1

Fedora has switched to cgroups v2 by default now, but Docker doesn’t yet support it and so fails to start. If you want to use Docker then you need to revert cgroups to v1 by adding the systemd.unified_cgroup_hierarchy=0 kernel argument.

Add systemd.unified_cgroup_hierarchy=0 to the default GRUB config with sed.

sudo sed -i '/^GRUB_CMDLINE_LINUX/ s/"$/ systemd.unified_cgroup_hierarchy=0"/' /etc/default/grub

Now rebuild your GRUB config.

If you’re using BIOS boot then it’s this.

sudo grub2-mkconfig -o /boot/grub2/grub.cfg

If you’re running EFI, then it’s this.

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

Now reboot and make sure Docker can start!

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