Failed to use this roles with lvm

I've failed to use this roles with lvm (at least on debian 10)

Error

if data to created VM is :

  volumes:
    - name: 'ns2'
      type: 'volume'
      capacity: '10GB'
      pool: 'lvm_pool'
      format: 'raw'

The role is crashing with this error

    "msg": "internal error: qemu unexpectedly closed the monitor: 2020-09-11T12:51:05.508705Z qemu-system-x86_64: -drive file=/dev/lvm_pool/ns3,format=raw,if=none,id=drive-virtio-disk0: Could not open '/dev/lvm_pool/ns3': Permission denied"

Debugging

• Debugging, virsh dumpxml <nodename> give me :

    <disk type='volume' device='disk'>
      <driver name='qemu' type='raw'/>
      <source pool='lvm_pool' volume='ns3'/>
      <target dev='vda' bus='virtio'/>
    </disk>

• Update the node via virsh edit <node>
  • replace <disk type='volume' device='disk'> with <disk type='block' device='disk'>
  • replace <source pool='lvm_pool' volume='ns3'/> with <source dev='/dev/lvm_pool/ns3'/>

It's now can boot

Change need

To permit these two line change (done on virsh edit) via ansible and your role :

• Need to add this in the template vm.xml.j2 :

      {% elif volume.pool is defined %}
      <source dev='/dev/{{ volume.pool }}/{{ volume.name }}'/>

• Need to change type from volume to block, so my variable will be :

  volumes:
    - name: 'ns2'
      type: 'block'
      capacity: '10GB'
      pool: 'lvm_pool'
      format: 'raw'

• As it's now a block volume, the tasks Ensure the VM volumes exist will be skipped (due to when condition)
  So needed to update volumes.yml condition (line 30)

from : when: item.type | default(libvirt_volume_default_type) == 'volume'
to : when: item.type | default(libvirt_volume_default_type) == 'volume' or ( item.type | default(libvirt_volume_default_type) == 'block' and item.pool is defined )

• Maybe, it's will also good to update the README to have a lvm example .

Start with vm.xml.j2 and volumes.yml around the named line 30 condition to trace how LVM-backed volumes are rendered and created. Check the README for the existing volume examples. Done means an Ansible configuration using a pool-backed block volume can create the volume and boot the VM without the reported permission error.