How can I find out how the network is being configured on a Jammy VM?

k9banger

I have configured a Jammy Proxmox VM system which generally comes up OK but the address is different from whats in /etc/network/interfaces.

It seems the settings I used during the installation can not be overridden by the contents of what I have put in /etc/network/interfaces.

Where else in the Jammy system has the network been configured?

It must be what the installation system uses.

This is the configuration I want which I have set in /etc/network/interfaces.

auto lo
iface lo inet loopback

auto ens18
iface ens18 inet static
address 10.0.0.20/24
gateway 10.0.0.254

This the only file in the /etc/netplan directory are the files I see in /etc/netplan/50-cloud-init.yaml

# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    ethernets:
        ens18:
            addresses:
            - 10.0.0.21/24
            nameservers:
                addresses:
                - 1.1.1.1
                - 8.8.8.8
                search: []
            routes:
            -   to: default
                via: 10.0.0.254
    version: 2

k9banger

After further investigation I found /etc/cloud/cloud.cfg.d/90-installer-network.cfg which this content.

# This is the network config written by 'subiquity'
network:
  ethernets:
    ens18:
      addresses:
      - 10.0.0.21/24
      nameservers:
        addresses:
        - 1.1.1.1
        - 8.8.8.8
        search: []
      routes:
      - to: default
        via: 10.0.0.254
  version: 2

So I suspect this is what is used at start up.

Is there some actual other I can use to override this, such as create a similar file with my preference and make it a higher priority?

keshwarsingh

echo 'network: {config: disabled}' | sudo tee /etc/cloud/cloud.cfg.d/99-custom-networking.cfg