What does it mean when Firewalld reports that the docker zone already exists and the docker-daemon fails to start?

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When Firewalld reports that the docker zone already exists, it means that there is already a zone in Firewalld's configuration with the name "docker." Alternatively, it could mean that there is a conflict with the existing configuration of the zone. This can cause the docker-daemon to fail to start as it requires a properly configured firewall to function correctly.

To resolve this issue, you can do the following:

1. Check the Firewalld configuration for any conflicting zones or rules.

2. If there is an existing "docker" zone, you can change the name of the zone or merge the existing zone with the docker zone.

3. Restart the Firewalld service and try starting the docker-daemon again.

If the issue persists, you may need to seek further assistance or troubleshooting based on your specific situation.