def METHOD_NAME():
    bastion_node = get_bastion_node(auth=True)
    prepare_private_registry(bastion_node, RANCHER_K3S_VERSION)
    ag_nodes = prepare_airgap_k3s(bastion_node, NUMBER_OF_INSTANCES,
                                  'private_registry')
    deploy_airgap_cluster(bastion_node, ag_nodes, "k3s",
                          K3S_SERVER_OPTIONS, K3S_AGENT_OPTIONS)
    optionally_add_cluster_to_rancher(bastion_node, ag_nodes)