Comment 5 for bug 1463461

Just for reference, in vivid (working):

$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 192.168.122.1

$ uname -r
3.19.0-18-generic

$ cat /proc/cmdline
nomodeset iscsi_target_name=tgt-boot-test-Pv7KUq iscsi_target_ip=192.168.1.132 iscsi_target_port=3260 iscsi_initiator=maas-enlist ip=::::maas-enlist:BOOTIF ro BOOTIF_DEFAULT=eth0 root=/dev/disk/by-path/ip-192.168.1.132:3260-iscsi-tgt-boot-test-Pv7KUq-lun-1 overlayroot=tmpfs console=ttyS0 console=tty1 debug ds=nocloud-net;seedfrom=http://192.168.1.132:32600/

$ cat /run/initramfs/open-iscsi.interface
eth0

$ cat /run/net-eth0.conf
DEVICE='eth0'
PROTO='dhcp'
IPV4ADDR='192.168.122.89'
IPV4BROADCAST='192.168.122.255'
IPV4NETMASK='255.255.255.0'
IPV4GATEWAY='192.168.122.1'
IPV4DNS0='192.168.122.1'
IPV4DNS1='0.0.0.0'
HOSTNAME='maas-enlist'
DNSDOMAIN=''
NISDOMAIN=''
ROOTSERVER='192.168.122.1'
ROOTPATH=''
filename=''
UPTIME='29'
DHCPLEASETIME='3600'
DOMAINSEARCH=''

$ cat /run/network/ifstate
eth0=eth0
lo=lo

$ sudo systemctl status -l ifup@*.service
sudo: unable to resolve host ubuntu
● <email address hidden> - ifup for eth0
   Loaded: loaded (/lib/systemd/system/ifup@.service; static; vendor preset: enabled)
  Drop-In: /lib/systemd/system/ifup@.service.d
           └─open-iscsi.conf
   Active: active (exited) since Wed 2015-06-10 12:56:45 UTC; 3min 52s ago
  Process: 514 ExecStart=/bin/sh -ec ifup --allow=hotplug %I; ifup --allow=auto %I; if ifquery %I >/dev/null; then ifquery --state %I >/dev/null; fi (code=exited, status=0/SUCCESS)
  Process: 455 ExecStartPre=/lib/open-iscsi/net-interface-handler start (code=exited, status=0/SUCCESS)
 Main PID: 514 (code=exited, status=0/SUCCESS)

Jun 10 12:56:45 ubuntu systemd[1]: <email address hidden> changed start-pre -> running
Jun 10 12:56:45 ubuntu systemd[1]: Job <email address hidden>/start finished, result=done
Jun 10 12:56:45 ubuntu systemd[1]: Started ifup for eth0.
Jun 10 12:56:45 ubuntu systemd[514]: Executing: /bin/sh -ec 'ifup --allow=hotplug eth0; ifup --allow=auto eth0; if ifquery eth0 >/dev/null; then ifquery --state eth0 >/dev/null; fi'
Jun 10 12:56:45 ubuntu sh[514]: ifup: interface eth0 already configured
Jun 10 12:56:45 ubuntu sh[514]: ifup: interface eth0 already configured
Jun 10 12:56:45 ubuntu systemd[1]: Child 514 belongs to <email address hidden>
Jun 10 12:56:45 ubuntu systemd[1]: <email address hidden>: main process exited, code=exited, status=0/SUCCESS
Jun 10 12:56:45 ubuntu systemd[1]: <email address hidden> changed running -> exited
Jun 10 12:56:45 ubuntu systemd[1]: <email address hidden>: cgroup is empty