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It turns out that the netplan configuration did assign the additional
loopback address to lo, but ifconfig couldn't display it, which was
misleading me. When I manually ran ifconfig lo:0 12.34.56.78 netmask
255.255.255.255 it displayed lo:0 just fine. But netplan assigned the
address to lo, not lo:0. Running ip addr revealed the additional IP
address on lo. Problem solved :-)
-Kartik
On 05/18/2018 02:14 PM, Kartik Subbarao wrote:
> Has anyone been successful with configuring real server VIP addresses
> (lo:0) on Ubuntu 18.04?
>
> Previously, I configured the loopback address in
> /etc/network/interfaces like this:
>
> auto lo:0
> iface lo:0 inet static
> address 12.34.56.78
> netmask 255.255.255.255
> pre-up sysctl -q -p
>
> On 18.04, I tried adding this section to the netplan config:
>
> network:
> ethernets:
> lo:
> addresses:
> - 12.34.56.78/32
>
> And then ran netplan apply. systemd-networkd logs the following:
>
> May 18 10:01:55 [...] systemd-networkd[3820]: lo: Adding address:
> 12.34.56.78/32 (valid forever)
> May 18 10:01:55 [...] systemd-networkd[3820]: lo: Adding address:
> 127.0.0.1/8 (valid forever)
> May 18 10:01:55 [...] systemd-networkd[3820]: rtnl: received address
> with invalid family 129, ignoring
>
> But it doesn't seem to have any effect (ifconfig doesn't list lo:0).
> Not sure what the invalid family 129 refers to. The actual address
> (it's not 12.34.56.78 :-) ) works fine when I manually use ifconfig to
> set it up.
>
> I also tried using lo:0 as the YAML key name, but then I get this error:
>
> May 18 10:00:06 [...] systemd-networkd[3736]:
> /run/systemd/network/10-netplan-lo:0.network:2: Interface name is not
> valid or too long, ignoring assignment: (null)
>
> Looks like systemd-networkd doesn't like lo:0 as an interface name.
> Any suggestions?
>
> Thanks,
>
> -Kartik
>
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