Installing Docker on Fedora 32

Published 2020-06-17

Installing Docker on Fedora 32 is a bit tricky, namely for these reasons:

There isn't an official repo for Fedora 32 yet, in the meantime we have to use Fedora 31
firewalld now uses nftables as the default backend but Docker seems to only work with iptables
Fedora switched to cgroups v2, but Docker doesn't support it yet

Luckily fixing these are pretty straight forward, I've coded these up into an Ansible task

- name: replace release version with 31
  become: yes
  replace:
    path: /etc/yum.repos.d/docker-ce.repo
    regexp: "\\$releasever"
    replace: "31"

- name: enable backwards compatibility for cgroups
  become: yes
  shell: grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=0"

- name: use iptables as firewalld backend over nftables
  become: yes
  replace:
    path: /etc/firewalld/firewalld.conf
    regexp: "FirewallBackend=nftables"
    replace: "FirewallBackend=iptables"

Resources:

https://dev.to/ozorest/fedora-32-how-to-solve-docker-internal-network-issue-22me