---
  - name: "Update firewall rules for Zabbix agent"
    hosts: all
    gather_facts: True
    become: true

    tasks:

      - name: Gather package facts
        package_facts:
          manager: auto

      - name: Populate systemd service_facts
        service_facts:
#
#################################
# Determine and set the firewall method
      - name: Set variable to indicate which firewall method is being used by a systemd
        set_fact:
          FW_METHOD: "ufw"
        when: "'ufw' in ansible_facts.packages"

      - name: Set variable to indicate which firewall method is being used by a systemd
        set_fact:
          FW_METHOD: "iptables"
        when: "'iptables' in ansible_facts.packages"

      - name: Set variable to indicate which firewall method is being used by a systemd
        set_fact:
          FW_METHOD: "firewalld"
        when:
          - ansible_facts.distribution_file_variety != "Debian"
          - ansible_facts.services['firewalld.service']['status'] == 'enabled' or ansible_facts.services['firewalld.service']['status'] == 'running'


      - name: Set variable to indicate which firewall method is being used by a systemd
        set_fact:
          FW_METHOD: "firewalld"
        when:
          - ansible_facts.distribution_file_variety != "Debian"
          - ansible_facts.services['iptables.service']['status'] == 'enabled' or ansible_facts.services['iptables.service']['status'] == 'running'

      - name: Show value of FW_METHOD
        debug:
          msg: FW_METHOD is "{{ FW_METHOD }}"