[SOLVED] Cloud-init IP config with IPv6=auto

[Loredo]

Hi,

it seems that the generated cloud-init.yaml file has an incorrect format for the network configuration if you set IPv6 to SLAAC for an interface.

The resulting file will have "auto/24" as an address which is an incorrect format I believe (a mix of IPv6 "auto" for the address and an IPv4 subnet of /24).

Consequently the cloud-init process is not able to handle the network setup correctly:

"Sterr: Error in network definition //etc/netplan/50-cloud-init.yaml line 10 column 12: malformed address 'auto/24', must be X.X.X.X/NN or X:X:X:X:X:X:X:X/NN"

Eventually I was logging in to the running machine and just removed that line of "- auto/24" from the file. After "netplan apply" the network would just come up as expected incl. IPv6 SLAAC.

Could this be corrected in the Proxmox packages? Thanks.

 

[dcsapak]

can you post the complete vm config ? qm config ID

 

[Loredo]

agent: 1
boot: c
bootdisk: scsi0
cipassword: **********
cores: 4
cpu: host
ide2: local-zfs:vm-200-cloudinit,media=cdrom,size=5M
ipconfig0: ip=192.168.1.100/24,gw=192.168.1.1,ip6=auto
memory: 4096
name: hostname.domain.tld
net0: virtio=99:BE:6B:01:D3:16,bridge=vmbr0
onboot: 1
ostype: l26
protection: 0
scsi0: local-zfs:base-9000-disk-0/vm-200-disk-0,size=32G
scsihw: virtio-scsi-pci
serial0: socket
smbios1: uuid=bdba4900-bb20-4a6f-a9d9-7fc4235aa5d0
sockets: 1
sshkeys: ##########
vga: serial0
vmgenid: f03e2acc-0a27-40f0-9157-3716307c074a

It would work if I remove "ip6=auto" using the console command:

qm set 200 --ipconfig0 ip=192.168.1.100/24,gw=192.168.1.1

Obviously the GUI won't let me do that.

 

[mira]

If you don't need an IPv6 address just set it to static without any IP or gateway.

 

[mira]

Looks like we don't handle SLAAC in our cloudinit code, please create a bugreport here: https://bugzilla.proxmox.com/

 

[Loredo]

Sadly I do need IPv6 with auto-configuration. Found my workaround as stated above it seems but the GUI support should somewhat be improved as the SLAAC option is quite irritating if it is not needed at all.

 

[mira]

If you're using an up-to-date Ubuntu 18.04 you might be able to make it work with dhcp (see https://github.com/CanonicalLtd/netplan/pull/10/files#diff-4e40b87174cfd3efbd425ab9f3bcec15)

 

[Loredo]

Thanks for pointing me to this, will check on it.