Template Conversion Issue - Base Disks not Created

[joshua60111]

Hi all,
I'm new to Proxmox and am having trouble creating a template for a Ubuntu VM:

I'm using Proxmox 7.4-3, the VM is Ubuntu 24-04 straight from osboxes.org.
I converted the .vmdk to .qcow2 with qemu and uploaded it to /var/lib/vz/images/102 and assigned the image to a disk with:
qm set 102 --scsi1 local:102/Ubuntu.qcow2 - Which works fine and boots no problem.

However, when I try to convert this machine to a template I get the following error:
root@pve:~# qm template 102
file '/var/lib/vz/images/102/Ubuntu.qcow2' already exists

No base disks are created, and although the VM is now marked as a template in the GUI I can't create any linked clones:


VM config before converting to template:
root@pve:~# qm config 102
boot: order=scsi1;ide2;net0
cores: 2
ide2: none,media=cdrom
memory: 4096
meta: creation-qemu=7.2.0,ctime=1726431596
name: UbuntuTest2
net0: rtl8139=E2:CF:88:2F:90:7C,bridge=vmbr0,firewall=1
numa: 0
ostype: l26
scsi1: local:102/Ubuntu.qcow2,size=500G
scsihw: virtio-scsi-single
smbios1: uuid=690abadb-f6f3-495c-9b93-384d4c2d4d4a
sockets: 1
vmgenid: 2dc760dd-38fd-429d-900c-f5c0da17ae3c
root@pve:~#

After converting to template:
root@pve:~# qm config 102
boot: order=scsi1;ide2;net0
cores: 2
ide2: none,media=cdrom
memory: 4096
meta: creation-qemu=7.2.0,ctime=1726431596
name: UbuntuTest2
net0: rtl8139=E2:CF:88:2F:90:7C,bridge=vmbr0,firewall=1
numa: 0
ostype: l26
scsi1: local:102/Ubuntu.qcow2,size=500G
scsihw: virtio-scsi-single
smbios1: uuid=690abadb-f6f3-495c-9b93-384d4c2d4d4a
sockets: 1
template: 1
vmgenid: 2dc760dd-38fd-429d-900c-f5c0da17ae3c

Any help would be appreciated. I'm probably doing something incredibly stupid.
Thanks in advance.

 

[bbgeek17]

Dont use custom names for your disks.

You have two options to try:
- Even though you'd be converting qcow to qcow, import the original disk from the start: qm disk import
- Or, rename "ubuntu.qcow" to name that conforms to PVE disk naming standards: vm-[id]-disk-[counter] before you "set" it.

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

 

[joshua60111]

Dont use custom names for your disks.

You have two options to try:
- Even though you'd be converting qcow to qcow, import the original disk from the start: qm disk import
- Or, rename "ubuntu.qcow" to name that conforms to PVE disk naming standards: vm-[id]-disk-[counter] before you "set" it.

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox

Thank you!

Uploading disk images in the format 'vm-<VMID>-disk-<ID>.qcow2' worked perfectly.
I could then use qm set 102 --scsi1 local:102/vm-102-disk-1.qcow2 and convert the machine to a template.

When I tried using importdisk, it automatically converted the image to .raw even though I uploaded as .qcow2. I don't think .raw works with templates so this solution didn't work for me - but the above solved my problem!
root@pve:~# qm importdisk 102 UbuntuTest2-102-disk-001.qcow2 local
importing disk 'UbuntuTest2-102-disk-001.qcow2' to VM 102 ...
Formatting '/var/lib/vz/images/102/vm-102-disk-0.raw', fmt=raw size=536870912000 preallocation=off

Thanks again!

 

[bbgeek17]

When I tried using importdisk, it automatically converted the image to .raw

Glad its working for you.

Note that you could have used option below to specify output format:
--format <qcow2 | raw | vmdk>
Target format

---

Blockbridge : Ultra low latency all-NVME shared storage for Proxmox - https://www.blockbridge.com/proxmox