create_loadbalancer.yml

---
- name: create loadbalancer setup
  hosts: all
  remote_user: ansible
  become: yes
  vars:
    haproxy_backend_name: 'habackend'
    haproxy_backend_mode: 'http'
    haproxy_backend_balance_method: 'roundrobin'
    haproxy_backend_httpchk: 'HEAD / HTTP/1.1\r\nHost:localhost'

    haproxy_frontend_name: 'hafrontend'
    haproxy_frontend_bind_address: '*'
    haproxy_frontend_port: 80
    haproxy_frontend_mode: 'http'

    haproxy_stats_enable: true
    haproxy_stats_port: 8080
    haproxy_stats_refresh: 15s
    haproxy_stats_username: 'admin'
    haproxy_stats_password: 'okboomer'
    haproxy_stats_uri: /stats

  pre_tasks:
    - name: create webserver and loadbalancer group
      group_by:
          key: server_role_{{ ansible_local['facts']['server_role'] }}

    - name: create empty list for collection of backend servers
      set_fact:
        backend_server_list: []

    - name: populate loadbalancer list of dictionaries
      set_fact:
          backend_server_list: "{{ backend_server_list + [ {'name': item, 'address': hostvars[item]['ansible_local']['facts']['external_ip'] + ':80'}] }}"
      loop: "{{ query('inventory_hostnames', 'server_role_webserver:!server_role_loadbalancer') }}"

  tasks:
    - include_role:
        name: geerlingguy.haproxy
      vars:
        haproxy_backend_servers: "{{ backend_server_list }}"
      when: "ansible_fqdn == 'loadbalancer.ibm.nontoonyt.com'"

  post_tasks:
    - name: add cloud servers to pool
      haproxy:
        state: enabled
        host: " {{ ansible_host }}"
        socket: /var/lib/haproxy/stats
        weight: 10
        backend: habackend
      delegate_to: loadbalancer.ibm.nontoonyt.com
      when: "ansible_fqdn != 'loadbalancer.ibm.nontoonyt.com'"