[PVE-User] Network device name change (with systemd) under debian after adding/removing line meta: from config file

[Fabian Grünbichler]

there was a change in how Qemu sets up PCI slots. we record the version with which the VM was first created exactly to avoid this change during the lifetime of the VM:

https://git.proxmox.com/?p=qemu-server.git;a=commitdiff;h=cc1810363579b8d6bf7dd8d681b831f33209bbb0

> Laurent CARON <lcaron at unix-scripts.info> hat am 21.06.2023 14:22 CEST geschrieben:
> 
>  
> Hi,
> 
> I'm experiencing a rather strange behavior with VM creation on a 7.7 
> proxmox cluster.
> 
> I do have quite old (migrated from older proxmox versions) VMs as well 
> as new VMs (created after the 7.2 version).
> 
> Config file:
> 
> $ cat /etc/pve/qemu-server/889.conf
> boot: order=virtio0;ide2;net0
> cores: 1
> cpu: host
> ide2: none,media=cdrom
> machine: q35
> memory: 2048
> meta: creation-qemu=7.0.0,ctime=1687340877
> name: vs-lcaron-testalacon
> net0: virtio=C2:B9:B3:FE:6C:B0,bridge=vmbr2000
> numa: 1
> ostype: l26
> scsihw: virtio-scsi-pci
> smbios1: uuid=ef269cd3-e7a6-442e-87ad-30b68741003b
> sockets: 1
> virtio0: VMs_NFS:889/vm-889-disk-0.qcow2,discard=on,size=64G
> vmgenid: ac09af11-7012-41eb-99e3-ca1162afc2bd
> 
> Using this config, VM installs fine.
> 
> Interface name is enp6s18
> 
> If I do remove the line 'meta: ...' from the config file, and restart 
> the VM's interface is now ens18.
> 
> Please note, when using 'meta: ...' lspci | grrp Ethernet is:
> 
> 06:12.0 Ethernet controller: Red Hat, Inc. Virtio network device
> 
> When not using 'meta: ...' lspci is exactly the same.
> 
> 
> What is changing behind the scenes when using 'meta: ' in the config file ?
> 
> 
> I'm trying to have a consistent naming across VMs, wether the VMs were 
> instanciated on an old or a new proxmox version.
> 
> Thanks
> 
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