openstack_user_config.yml

---
cidr_networks: &cidr_blocks
  container: 172.29.236.0/22
  tunnel: 172.29.240.0/22
  storage: 172.29.244.0/22

used_ips:
  - "172.29.236.1,172.29.236.50"
  - "172.29.236.100"
  - "172.29.240.1,172.29.240.50"
  - "172.29.240.100"
  - "172.29.244.1,172.29.244.50"
  - "172.29.244.100"
  - "172.29.248.1,172.29.248.50"
  - "172.29.248.100"

global_overrides:
  internal_lb_vip_address: 172.29.236.100
  # The external IP is quoted simply to ensure that the .aio file can be used as input
  # dynamic inventory testing.
  external_lb_vip_address: "172.17.0.6"
  tunnel_bridge: "br-vxlan"
  management_bridge: "br-mgmt"
  cidr_networks: *cidr_blocks
  provider_networks:
    - network:
        container_bridge: "br-mgmt"
        container_type: "veth"
        container_interface: "eth1"
        ip_from_q: "container"
        type: "raw"
        group_binds:
          - all_containers
          - hosts
        is_container_address: true
        is_ssh_address: true
    - network:
        container_bridge: "br-vxlan"
        container_type: "veth"
        container_interface: "eth10"
        ip_from_q: "tunnel"
        type: "vxlan"
        range: "1:1000"
        net_name: "vxlan"
        group_binds:
          - neutron_linuxbridge_agent
    - network:
        container_bridge: "br-vlan"
        container_type: "veth"
        container_interface: "eth12"
        host_bind_override: "eth12"
        type: "flat"
        net_name: "flat"
        group_binds:
          - neutron_linuxbridge_agent
    - network:
        container_bridge: "br-vlan"
        container_type: "veth"
        container_interface: "eth11"
        type: "vlan"
        range: "1:1"
        net_name: "vlan"
        group_binds:
          - neutron_linuxbridge_agent
    - network:
        container_bridge: "br-storage"
        container_type: "veth"
        container_interface: "eth2"
        ip_from_q: "storage"
        type: "raw"
        group_binds:
          - glance_api
          - cinder_api
          - cinder_volume
          - nova_compute
          - swift_proxy

# galera, memcache, rabbitmq, utility
shared-infra_hosts:
  aio1:
    ip: 172.29.236.100

repo-infra_hosts:
  aio1:
    ip: 172.29.236.100

log_hosts:
  aio1:
    ip: 172.29.236.100

haproxy_hosts:
  aio1:
    ip: 172.29.236.100

test_output

$ sudo ansible -e @/etc/openstack_deploy/user_variables.yml localhost -m debug -a msg="{{ [monitor_interface, public_network, cluster_network] | join(' ') }}"
Variable files: "-e @/etc/openstack_deploy/user_secrets.yml -e @/etc/openstack_deploy/user_variables.yml "
localhost | SUCCESS => {
    "msg": "br-mgmt 172.29.236.0/22 172.29.244.0/22"
}

user_variables.yml

monitor_interface: "{{ management_bridge }}"
public_network: "{{ cidr_networks.container }}"
cluster_network: "{{ cidr_networks.storage }}"