ZONE_CONFLICT: 'docker0' already bound to a zone

Fix.md

1. Check if docker zone exists in firewall-cmd

$ firewall-cmd --get-active-zones

2. If "docker" zone is available, change interface to docker0 (not persisted)

$ sudo firewall-cmd --zone=docker --change-interface=docker0

3. If "docker" zone is available, change interface to docker0 (persisted, thanks rbjorklin)

$ sudo firewall-cmd --permanent --zone=docker --change-interface=docker0
$ sudo systemctl restart firewalld

Thank you!

Thank you)