The magnum section is used to declare configuration specific information
used by magnum-tempest-plugin
The keys used are:
- nic_id, to indicate the external network
- image_id, to indicate the fedora-coreos image to be used
- flavor_id, the flavor id to use when creating clusters
- dns_nameserver, the upstream dns server IP.
- network_driver, the network driver to test (flannel).
- labels, to pass a custom (local) image registry.
- insecure_registry, to mark the custom image registry as http (instead
of https).
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