Install Docker on Rocky Linux or AlmaLinux
Install Docker Engine on Rocky Linux or AlmaLinux with dnf, then fix what Ubuntu guides skip: podman owning the docker command and SELinux on bind mounts.
#firewalld
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firewalld basics for a Rocky or AlmaLinux VPS
Open SSH, allow a web port, close one, and survive a reboot with firewalld on Rocky or AlmaLinux. Zones explained, plus the --permanent trap.