okd/playbooks/libvirt/openshift-cluster/cluster_hosts.yml

---
etcd_hosts:   "{{ (groups['tag_host-type-etcd']|default([]))
                   | intersect((groups['tag_clusterid-' ~ cluster_id]|default([])))
                   | intersect((groups['tag_environment-' ~ cluster_env]|default([]))) }}"

lb_hosts:     "{{ (groups['tag_host-type-lb']|default([]))
                   | intersect((groups['tag_clusterid-' ~ cluster_id]|default([])))
                   | intersect((groups['tag_environment-' ~ cluster_env]|default([]))) }}"

master_hosts: "{{ (groups['tag_host-type-master']|default([]))
                   | intersect((groups['tag_clusterid-' ~ cluster_id]|default([])))
                   | intersect((groups['tag_environment-' ~ cluster_env]|default([]))) }}"

node_hosts:   "{{ (groups['tag_host-type-node']|default([]))
                   | intersect((groups['tag_clusterid-' ~ cluster_id]|default([])))
                   | intersect((groups['tag_environment-' ~ cluster_env]|default([]))) }}"

nfs_hosts:    "{{ (groups['tag_host-type-node']|default([]))
                   | intersect((groups['tag_env-' ~ cluster_id]|default([]))) }}"