Add routes to /etc/netplan/50-cloud-init.yaml - OVH Ubuntu 18.04 network not working by default

[Damo-HG]

Right now cloud-init is generating the following netplan config file /etc/netplan/50-cloud-init.yaml

network:
    version: 2
    ethernets:
        eth0:
            addresses:
            - 145.239.202.202/32
            - 2001:41d0:800:226f::3/128
            gateway4: 51.89.172.254
            gateway6: 2001:41d0:800:22ff:ff:ff:ff:ff
            match:
                macaddress: 02:00:00:ff:3b:ea
            nameservers:
                addresses:
                - 213.186.33.99
                search: []
            set-name: eth0

To get the network working OVH requires me to either add routes or set dhcp4: true (but that wont get ipv6 working) and it's set to false by default anyway. I need to add the following onto the end of the 50-cloud-init.yaml file

        routes:
        - to: 51.89.172.254/32
          via: 0.0.0.0
          scope: link
        - to: 2001:41d0:800:22ff:ff:ff:ff:ff
          scope: link

It should end up looking like:

network:
    version: 2
    ethernets:
        eth0:
            addresses:
            - 145.239.202.202/32
            - 2001:41d0:800:226f::3/128
            gateway4: 51.89.172.254
            gateway6: 2001:41d0:800:22ff:ff:ff:ff:ff
            match:
                macaddress: 02:00:00:ff:3b:ea
            nameservers:
                addresses:
                - 213.186.33.99
                search: []
            set-name: eth0
            routes:
            - to: 51.89.172.254/32
              via: 0.0.0.0
              scope: link
            - to: 2001:41d0:800:22ff:ff:ff:ff:ff
              scope: link

What exactly is the file that determines the layout of the above settings inside the VM? Where is it located in my Proxmox Node or virtual machine. I presume it's somewhere in the Proxmox node that determines the layout of the file.

 

[Alwin]

The cloud-init config is generated. To use your own ci file, see our docs.
https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_custom_cloud_init_configuration