added vagrant build

ansible/install_keepalived.yaml

@@ -0,0 +1,79 @@
+---
+- 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:
+    - vault.yml
+    - vars.yml
+
+  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: 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 {
+              192.168.56.250
+            }
+          }
+        owner: root
+        group: root
+        mode: "0644"
+
+    - name: Enable and restart keepalived service
+      ansible.builtin.systemd:
+        name: keepalived
+        enabled: true
+        state: restarted