ansible: Automate MAC addresses

Automate the creation and assignment of random MAC addresses to libvirt VMs, if the user has not specified one. Make the MAC addresses reusable by storing them in a `state.ini` file. Signed-off-by: Dimitris Poulopoulos <[email protected]>
dpoulopoulos · Jun 21, 2024 · c1c53b0 · c1c53b0
1 parent aa486b0
commit c1c53b0
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Showing 4 changed files with 26 additions and 5 deletions.
diff --git a/ansible/inventory/hosts.yml b/ansible/inventory/hosts.yml
@@ -17,19 +17,14 @@ all:
       hosts:
         node1:
           virt_domain_name: node1
-          virt_domain_net_macaddress: 52:54:00:DD:B9:81
         node2:
           virt_domain_name: node2
-          virt_domain_net_macaddress: 52:54:00:0A:B8:82
         node3:
           virt_domain_name: node3
-          virt_domain_net_macaddress: 52:54:00:2E:AB:32
         node4:
           virt_domain_name: node4
-          virt_domain_net_macaddress: 52:54:00:19:F2:EF
         node5:
           virt_domain_name: node5
-          virt_domain_net_macaddress: 52:54:00:6C:BA:E1
     admin:
       hosts:
         boogie:
diff --git a/ansible/roles/libvirt-domain/handlers/inventory.yml b/ansible/roles/libvirt-domain/handlers/inventory.yml
@@ -0,0 +1,5 @@
+---
+- name: reload-inventory
+  ansible.builtin.meta: refresh_inventory
+  delegate_to: localhost
+  run_once: true
diff --git a/ansible/roles/libvirt-domain/handlers/main.yml b/ansible/roles/libvirt-domain/handlers/main.yml
@@ -0,0 +1,3 @@
+---
+- name: Handle local inventory
+  import_tasks: inventory.yml
diff --git a/ansible/roles/libvirt-domain/tasks/domain.yml b/ansible/roles/libvirt-domain/tasks/domain.yml
@@ -22,6 +22,24 @@
       qemu-img create -f qcow2 {{ hostvars[virt_host].virt_pool_dir }}/{{ virt_domain_name }}.qcow2 {{ virt_domain_disk_gb }}G
     creates: '{{ hostvars[virt_host].virt_pool_dir }}/{{ virt_domain_name }}.qcow2'
 
+- name: Get or create the MAC address variable
+  delegate_to: '{{ virt_host }}'
+  set_fact:
+    virt_domain_net_macaddress:
+      '{{ virt_domain_net_macaddress |
+          default("52:54:00" | community.general.random_mac) }}'
+
+- name: Store the MAC address in state.ini
+  delegate_to: localhost
+  throttle: 1
+  notify: reload-inventory 
+  community.general.ini_file:
+    path: '{{ inventory_dir}}/state.ini'
+    section: libvirt
+    option: '{{ inventory_hostname }} virt_domain_net_macaddress'
+    value: '{{ virt_domain_net_macaddress }}'
+    no_extra_spaces: true
+
 - name: Define libvirt domain
   delegate_to: '{{ virt_host }}'
   community.libvirt.virt: