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I updated docker on my fedora system. After this when I run docker commands I get the error "Cannot contact docker daemon".
Running systemctl status docker shows me that the docker daemon failed to start.
Inspecting journald with journald -xe shows me the following error :
ERROR: ZONE_CONFLICT: 'docker0' already bound to a zone
Do :
sudo firewall-cmd --permanent --zone=trusted --remove-interface=docker0
Then restart the docker service.
Edit: also restart the firewalld service (thanks @kofemann)