Add support for logging serial console to a file

Author: markgoddard

README.md

@@ -50,6 +50,9 @@ allocated.
 Each network interface is defined with the following dict:
 - `network`: Name of the network to which an interface should be attached.
 
+`libvirt_vm_console_log_path`: Path to console log file. Default is
+`/var/log/libvirt/qemu/{{ libvirt_vm_name }}-console.log`.
+
 `libvirt_vm_image_cache_path`: path to cache downloaded images.
 
 Dependencies

defaults/main.yml

@@ -34,6 +34,9 @@ libvirt_vm_volumes: []
 # List of network interfaces.
 libvirt_vm_interfaces: []
 
+# Path to console log file.
+libvirt_vm_console_log_path: "/var/log/libvirt-consoles/{{ libvirt_vm_name }}.log"
+
 # Path to cache downloaded images.
 libvirt_vm_image_cache_path:
 

tasks/vm.yml

@@ -1,4 +1,14 @@
 ---
+- name: Ensure the VM console log directory exists
+  file:
+    path: "{{ libvirt_vm_console_log_path | dirname }}"
+    state: directory
+    owner: qemu
+    group: qemu
+    recurse: true
+    mode: 0770
+  become: true
+
 - name: Ensure the VM is defined
   virt:
     name: "{{ libvirt_vm_name }}"

templates/vm.xml.j2

@@ -26,11 +26,13 @@
       <model type='virtio'/>
     </interface>
 {% endfor %}
-    <serial type='pty'>
-       <target port='0'/>
+     <serial type='file'>
+       <source path='{{ libvirt_vm_console_log_path }}'/>
      </serial>
-     <console type='pty'>
-       <target type='serial' port='0'/>
+     <serial type='pty'/>
+     <console type='file'>
+       <source path='{{ libvirt_vm_console_log_path }}'/>
+       <target type='serial'/>
      </console>
   </devices>
 </domain>