Having issues adding a virtual interface with netplan

[Rob]

Hey there,

I'm working with a group of openvpn ubuntu servers that use eth0 as their main interface, then when openvpn is started, it brings up tun0, tun1, tun2 ..

Anyway, I'm trying to add a 2nd private ip on eth0 as 'eth0:0' but this is Ubuntu 18.04 which uses netplan now..

So, in /etc/netplan/50-cloud-init.yaml is:

# 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:
        eth0:
            dhcp4: true
            dhcp4-overrides:
                route-metric: 100
            dhcp6: false
            match:
                driver: hv_netvsc
                macaddress: 00:0d:3a:a5:3c:48
            set-name: eth0
    version: 2

I tried this:

# 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:
        eth0:
            dhcp4: true
            dhcp4-overrides:
                route-metric: 100
            dhcp6: false
            match:
                driver: hv_netvsc
                macaddress: 00:0d:3a:a5:3c:48
            set-name: eth0
            addresses:
                - 10.0.0.1/24:
                    lifetime: 0
                    label: "eth0:0"
    version: 2

(after reading online a little)

but getting the following error after running 'netplan apply'

root@gwvpn-prod-centralus-az1-vm:/etc/netplan# netplan apply
/etc/netplan/50-cloud-init.yaml:18:19: Error in network definition: expected scalar
                - 10.0.0.1/24:
                  ^

Any ideas?

 

[f33dm3bits]

Isn't netplan just a front-end for NetworkManager, at least on Ubuntu 20.04 it is don't know about 18.04. Why not use NetworkManager directly? Try using the debug option.

netplan --debug apply

 

[Rob]

I'll give that a try, i've always just added in /etc/network/interfaces

 

[wizardfromoz]

Let us know how it goes, Rob

Wiz

 

[Adamantine]

Hello Rob, please note that you use "label" parameter, this feature is available from netplan < 100 version. Upgrade your neplan to the latest version (min 100) and then you will can apply your configuration in netplan.

 

[Rob]

Oops, didn't update the thread. I ended up just using this within that yaml:

            addresses:
                - 10.0.0.1/24