Looks like qemu-img version 6.1.0 needs "-F" parameter

[goetzrieger]

Couldn't deploy on a CentOS 8 Stream Hetzner server with latest updates because creating the images with qemu failed.

Looks like at least in qemu-img 6.1.0 the "-F" for target format is needed. I didn't hand in a PR because I don't know if this would break older qemu-img versions...

So in ansible/roles/openshift-4-cluster/tasks/create-vm.yml I changed

- name: Create disk for {{ vm_instance_name }}
  command: "qemu-img create -f qcow2 -b {{ coreos_image_location }} /var/lib/libvirt/images/{{ vm_instance_name }}.qcow2 {{ vm_root_disk_size }}"
  args:
    creates: "/var/lib/libvirt/images/{{ vm_instance_name }}.qcow2"
  when: vm_storage_backend == "qcow2"

to

- name: Create disk for {{ vm_instance_name }}
  command: "qemu-img create -f qcow2 -F qcow2 -b {{ coreos_image_location }} /var/lib/libvirt/images/{{ vm_instance_name }}.qcow2 {{ vm_root_disk_size }}"
  args:
    creates: "/var/lib/libvirt/images/{{ vm_instance_name }}.qcow2"
  when: vm_storage_backend == "qcow2"

And all is well... ;)

[rbo]

Thanks for the Issue @goetzrieger

$ qemu-img --version
qemu-img version 4.2.0 (qemu-kvm-4.2.0-48.module+el8.4.0+11909+3300d70f.3)
Copyright (c) 2003-2019 Fabrice Bellard and the QEMU Project developers
$ qemu-img create --help | grep create
  create [--object objectdef] [-q] [-f fmt] [-b backing_file] [-F backing_fmt] [-u] [-o options] filename [size]

My version si quite old... (rhel8.4)

@goetzrieger: What is the output of qemu-img create --help ?

[rbo]

ah at my fedora workstation:

$ qemu-img --version
qemu-img version 6.1.0 (qemu-6.1.0-10.fc35)
Copyright (c) 2003-2021 Fabrice Bellard and the QEMU Project developers
$ qemu-img create --help  |grep create
  create [--object objectdef] [-q] [-f fmt] [-b backing_file] [-F backing_fmt] [-u] [-o options] filename [size]
       contain only zeros for qemu-img to create a sparse image during
  '-n' skips the target volume creation (useful if the volume is created
  'snapshot' is the name of the snapshot to create, apply or delete
  '-c' creates a snapshot
$

It looks like overall -F is the right option. I will fix this. Thanks.

[rbo]

Fixed in Devel tree

[rbo]

Merged into master.