infctl-cli/vagrant/dev/ubuntu/ansible/install_keepalived.yaml

---
- name: Install keepalived on 3-node cluster
  hosts: vm1,vm2,vm3
  become: true
  become_user: root
  serial: 1 # Ensure tasks are executed one host at a time

  vars_files:
    - vars.yaml

  vars:
    tailscale_host: "{{ hostvars[inventory_hostname]['tailscale_host'] }}"

  tasks:
    # - name: Debug gathered facts
    #   ansible.builtin.debug:
    #     var: ansible_facts

    # - name: List all network interfaces and their IPs
    #   ansible.builtin.debug:
    #     msg: "{{ item.key }}: {{ item.value.ipv4 | map(attribute='address') | list }}"
    #   with_dict: "{{ ansible_facts['network_interfaces'] }}"
    #   when: ansible_facts['network_interfaces'] is defined
    # - name: Debug k3s_url_ip
    #   ansible.builtin.debug:
    #     msg: "k3s_url_ip: {{ k3s_url_ip }}"

    - name: Detect interface with the desired IP range
      ansible.builtin.set_fact:
        keepalived_interface: "{{ item.key }}"
      with_dict: "{{ ansible_facts['network_interfaces'] }}"
      when: item.value.ipv4 is defined and item.value.ipv4 | selectattr('address', 'search', '^192\\.168\\.56\\.') | list | length > 0
      register: detected_interface

    - name: Set detected interface fact
      ansible.builtin.set_fact:
        keepalived_interface: "{{ detected_interface.ansible_facts.keepalived_interface }}"
      when: detected_interface is defined and detected_interface.ansible_facts is defined

    - name: Fallback to default interface if no match is found
      ansible.builtin.set_fact:
        keepalived_interface: "enp0s8"
      when: keepalived_interface is not defined

    - name: Fail if no interface is detected even after fallback
      ansible.builtin.fail:
        msg: "No interface with the desired IP range was detected, and fallback to default interface failed."
      when: keepalived_interface is not defined

    - name: Install keepalived
      ansible.builtin.apt:
        name: keepalived
        state: present

    - name: Configure keepalived on each node with decremented priority
      ansible.builtin.copy:
        dest: /etc/keepalived/keepalived.conf
        content: |
          vrrp_instance VI_1 {
            state MASTER
            interface {{ keepalived_interface }}
            virtual_router_id 51
            priority {{ 100 - (groups['vms'].index(inventory_hostname)) }}
            advert_int 1
            authentication {
              auth_type PASS
              auth_pass mysecret
            }
            virtual_ipaddress {
              {{ k3s_url_ip }}
            }
          }
        owner: root
        group: root
        mode: "0644"

    - name: Enable and restart keepalived service
      ansible.builtin.systemd:
        name: keepalived
        enabled: true
        state: restarted