Adding mnaio qemu file backends

mnaio uses LVM as default VM disk backend but that
requires a lot of available disk space.
A alternative option, the qcow2 file based backend
is added to take benefit of thin provisioning.
This backend can be triggered by setting the override
`default_vm_disk_mode` to `file`

Change-Id: Iaf97fef601f656901b6913eaafb9a6c28d4b7ba6

multi-node-aio/playbooks/deploy-vms.yml

@@ -38,22 +38,41 @@
 
     - name: Delete VM LV
       lvol:
-        vg: vg01
+        vg: "{{ default_vm_disk_vg }}"
         lv: "{{ hostvars[item]['server_hostname'] }}"
         state: absent
         force: yes
       failed_when: false
       when:
         - hostvars[item]['server_vm'] | default(false) | bool
+        - default_vm_disk_mode | default('lvm') == "lvm"
+      with_items: "{{ groups['pxe_servers'] }}"
+
+    - name: Delete VM Disk Image
+      command: |
+        rm -f /var/lib/libvirt/images/{{ hostvars[item]['server_hostname'] }}.img
+      failed_when: false
+      when:
+        - hostvars[item]['server_vm'] | default(false) | bool
+        - default_vm_disk_mode | default('lvm') == "file"
       with_items: "{{ groups['pxe_servers'] }}"
 
     - name: Create VM LV
       lvol:
-        vg: vg01
+        vg: "{{ default_vm_disk_vg }}"
         lv: "{{ hostvars[item]['server_hostname'] }}"
         size: "{{ default_vm_storage }}"
       when:
         - hostvars[item]['server_vm'] | default(false) | bool
+        - default_vm_disk_mode | default('lvm') == "lvm"
+      with_items: "{{ groups['pxe_servers'] }}"
+
+    - name: Create VM Disk Image
+      command: |
+        qemu-img create -f qcow2 /var/lib/libvirt/images/{{ hostvars[item]['server_hostname'] }}.img {{ default_vm_storage }}m
+      when:
+        - hostvars[item]['server_vm'] | default(false) | bool
+        - default_vm_disk_mode | default('lvm') == "file"
       with_items: "{{ groups['pxe_servers'] }}"
 
     - name: Create the VM template

multi-node-aio/playbooks/group_vars/all.yml

@@ -14,6 +14,8 @@
 default_interface: "{{ default_network | default('eth0') }}"
 default_vm_image: "{{ default_image | default('ubuntu-16.04-amd64') }}"
 default_vm_storage: "{{ vm_disk_size | default(92160) }}"
+default_vm_disk_mode: lvm
+default_vm_disk_vg: vg01
 default_acng_bind_address: 0.0.0.0
 default_os_families:
   ubuntu-16.04-amd64: debian
@@ -26,7 +28,7 @@ default_ubuntu_mirror_directory: /ubuntu
 
 default_container_tech: "{{ container_tech | default('lxc') }}"
 
-ipxe_kernel_url: "{{ ipxe_kernel_url | default('http://boot.ipxe.org/ipxe.lkrn') }}"
+ipxe_kernel_url: "http://boot.ipxe.org/ipxe.lkrn"
 
  # IP address, or domain name of the TFTP server
 tftp_server: "{{ hostvars[groups['pxe_hosts'][0]]['ansible_host'] | default(ansible_host) }}"

multi-node-aio/playbooks/kvm/kvm-vm.xml

@@ -34,9 +34,15 @@
   </pm>
   <devices>
     <emulator>/usr/bin/kvm-spice</emulator>
+{% if default_vm_disk_mode == "lvm" %}
     <disk type='block' device='disk'>
       <driver name='qemu' type='raw' cache='none' io='native'/>
-      <source dev='/dev/vg01/{{ hostvars[item]["server_hostname"] }}'/>
+      <source dev='/dev/{{ default_vm_disk_vg }}/{{ hostvars[item]["server_hostname"] }}'/>
+{% elif default_vm_disk_mode == "file" %}
+    <disk type='file' device='disk'>
+      <driver name='qemu' type='qcow2' cache='none' io='native'/>
+      <source file='/var/lib/libvirt/images/{{ hostvars[item]["server_hostname"] }}.img'/>
+{% endif %}
       <target dev='vda' bus='virtio'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
       <boot order='1'/>

multi-node-aio/playbooks/setup-host.yml

@@ -174,6 +174,8 @@
     - name: Locate data volume
       command: "vgdisplay vg01"
       failed_when: false
+      when:
+        - default_vm_disk_mode | default('lvm') == "lvm"
       register: data_volume
 
     - name: Locate data disk
@@ -181,17 +183,20 @@
         lsblk -brndo NAME,TYPE,FSTYPE,RO,SIZE | awk '/d[b-z]+ disk +0/{ if ($4>m){m=$4; d=$1}}; END{print d}'
       register: lsblk
       when:
+        - default_vm_disk_mode | default('lvm') == "lvm"
         - data_volume.rc != 0
         - mnaio_data_disk is undefined
 
     - name: Create data disk label
       command: "parted --script /dev/{{ mnaio_data_disk | default(lsblk.stdout) }} mklabel gpt"
       when:
+        - default_vm_disk_mode | default('lvm') == "lvm"
         - data_volume.rc != 0
 
     - name: Create data disk partition
       command: "parted --align optimal --script /dev/{{ mnaio_data_disk | default(lsblk.stdout) }} mkpart data1 ext4 0% 100%"
       when:
+        - default_vm_disk_mode | default('lvm') == "lvm"
         - data_volume.rc != 0
 
     - name: Create data volume group
@@ -199,11 +204,14 @@
         vg: vg01
         pvs: "/dev/{{ mnaio_data_disk | default(lsblk.stdout) }}1"
       when:
+        - default_vm_disk_mode | default('lvm') == "lvm"
         - data_volume.rc != 0
 
     - name: Locate virsh data volume
       command: "virsh pool-info vg01"
       failed_when: false
+      when:
+        - default_vm_disk_mode | default('lvm') == "lvm"
       register: virsh_data_volume
 
     - name: Create /etc/libvirt/storage directory
@@ -218,6 +226,7 @@
         virsh pool-define /etc/libvirt/storage/vg01.xml
         virsh pool-autostart vg01 || true
       when:
+        - default_vm_disk_mode | default('lvm') == "lvm"
         - virsh_data_volume.rc != 0
 
     - name: Load virtio kernel modules