Firewalld issue with docker on Fedora 35

Problem

Issue faced when running "docker-compose pull" on Fedora 35 (fresh install)

Error:

failed to start daemon: Error initializing network controller: Error creating default "bridge" network: Failed to program NAT chain: ZONE_CONFLICT: 'docker0' already bound to 'trusted'

Active firewall zones:

FedoraWorkstation
    interfaces: wlp0s20f3
trusted
    interfaces: docker0 

Issue

Issue was with the friewalld zone configuration. The docker0 interface was under trusted zone instead of docker zone which cased a zone conflict.

Solution

• Create a new docker zone

  • sudo groupadd docker

• bound docker0 interface from trusted-zone to docker-zone

  • sudo firewall-cmd --permanent --zone=docker --change-interface=docker0

• delete docker0 from trusted zone

  • sudo firewall-cmd --permanent --zone=trusted --remove-interface=docker0

• restart firewalld and docker services

  • sudo firewall-cmd --reload
  • sudo service docker restart

• Correct Active firewal zones

  • FedoraWorkstation
        interfaces: wlp0s20f3
    docker
        interfaces: docker0