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 > _______________________________________________ Please read the documentation before posting - it's available at: http://www.linuxvirtualserver.org/ LinuxVirtualServer.org mailing list - lvs-users@LinuxVirtualServer.org Send requests to lvs-users-requ...@linuxvirtualserver.org or go to http://lists.graemef.net/mailman/listinfo/lvs-users
