assign multiple ip to VM using cloud-init

[n0bie]

does anyone can give us the script cloud-init to build / create VM with 2 ip address directly into os linux ?
in this case cloud-init from proxmox only support 1 ip public..how if we assign 2 ip address?
thanks

 

[gurubert]

I don't think this is possible with cloud-init.

Cloud-init is meant to make the newly deployed machine available over the network for other automation tools to take over.

Configure your second IP address with e.g. Ansible after the VM is up and running.

 

[fiona]

Hi,
for each virtual NIC (net[n]) you configure for the VM, you can configure the IP with the corresponding ipconfig[n] cloud-init setting. See man qm for the details of the setting or the Cloud-Init panel for the VM in the UI.

 

[n0bie]

Hi,
for each virtual NIC (net[n]) you configure for the VM, you can configure the IP with the corresponding ipconfig[n] cloud-init setting. See man qm for the details of the setting or the Cloud-Init panel for the VM in the UI.

so u mean using cloud-init possible to assign multiple ip? can u give me example under proxmox please? in this case we only able to assign 1 ip only

 

[fiona]

so u mean using cloud-init possible to assign multiple ip? can u give me example under proxmox please? in this case we only able to assign 1 ip only

Example configuration, relevant settings are net{0,1} and ipconfig{0,1}:

boot: c
bootdisk: scsi0
cipassword: $5$CJNhfoT0$dk7lpMTPhq2c/0MeFy.RePr9VeC7sB6K53ddU1fmpf3
ciuser: rooty
cores: 4
ide2: local:9006/vm-9006-cloudinit.qcow2,media=cdrom
ipconfig0: ip=192.168.20.155/24
ipconfig1: ip=192.168.21.155/24
memory: 4384
meta: creation-qemu=7.0.0,ctime=1663838846
name: foobar
net0: virtio=66:10:DF:FA:72:F9,bridge=vmbr0
net1: virtio=42:B9:7D:DD:53:23,bridge=vmbr1
scsi0: myzpool:vm-9006-disk-0,size=2G
scsihw: virtio-scsi-pci
serial0: socket
smbios1: uuid=d5930ac8-f28a-4f61-9900-38157358495f
vga: serial0
vmgenid: 201debc7-989c-4ed8-a567-be925793ca39

In the UI, just add the NICs in the VM's Hardware tab first and then set the IP Config settings in the Cloudinit tab for the VM.

 

[n0bie]

i mean 1 eth0 but contain 2 ips.. possible?

in your tutorial it shows eth0 and eth1.

 

[fiona]

i mean 1 eth0 but contain 2 ips.. possible?

in your tutorial it shows eth0 and eth1.

You can assign one IPv4 and one IPv6 address. I don't think it's possible otherwise with the usual configuration mechanism. Why would you need that?

 

[gurubert]

i mean 1 eth0 but contain 2 ips.. possible?

This is not possible with cloud-init. You would need to run Ansible or similar to add the second IP address.

 

[n0bie]

okay thanks

 

[fiona]

It might actually be possible with cloud-init too if the guest runs something like Netplan. Translating/Summarizing what @mira said here:

You can write a script based on the v2 network config format [1] and pass it as-is to the VM/Netplan via the --cicustom parameter, see section 10.8.3 of [0].

[0] https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_cloud_init (10.8.3)
[1] https://cloudinit.readthedocs.io/en/latest/topics/network-config-format-v2.html

 

[n0bie]

It might actually be possible with cloud-init too if the guest runs something like Netplan. Translating/Summarizing what @mira said here:

You can write a script based on the v2 network config format [1] and pass it as-is to the VM/Netplan via the --cicustom parameter, see section 10.8.3 of [0].

[0] https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_cloud_init (10.8.3)
[1] https://cloudinit.readthedocs.io/en/latest/topics/network-config-format-v2.html

how about cloud-init in proxmox? they only able to assign 1 ip address only per network ethernet...

 

[fiona]

how about cloud-init in proxmox? they only able to assign 1 ip address only per network ethernet...

Yes, the ipconfigN options only allow one IPv4 and IPv6 address. If you need more advanced configuration, you need to use a different mechanism.

 

[openminded]

I am using the Terraform provider for Proxmox that uses netplan. I have a similar issue where the second NIC gets no IP, while the netplan config actually works when applied after the first terraform run.

The reason it doesn´t work the first time is because the terraform run does not get past qemu-tools not running. I detailed it in a bug report :
https://github.com/bpg/terraform-provider-proxmox/issues/1592

For who knows how netplan works, try if works and any help with the bug is appreciated, for example if anyone can point out if this has to do with Proxmox cloud-init or not.
Thank you!

[update] posted a workaround via cloud-init script[/update]