[Bug 1821867] Re: network interface is down after post-install reboot of a default disco installation

[Frank Heimes]

** Changed in: systemd (Ubuntu)
       Status: New => Invalid

** No longer affects: systemd (Ubuntu)

** Changed in: ubuntu-z-systems
       Status: Triaged => In Progress

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https://bugs.launchpad.net/bugs/1821867

Title:
  network interface is down after post-install reboot of a default disco
  installation

Status in Ubuntu on IBM z Systems:
  In Progress
Status in netplan.io package in Ubuntu:
  In Progress

Bug description:
  [Impact]
  Minimal installs using netplan to configure the network.

  [Test case]
  1) Install Ubuntu minimal server / cloud image
  2) Edit /etc/netplan/01-netcfg.yaml to configure the network as necessary.
  3) Run 'sudo netplan apply'. Verify that the network comes up correctly.
  4) Reboot.
  5) Verify that the network comes up properly.

  [Regression potential]
  Minimal; this reverts changes in a package that was never released to -updates, only available as SRU in -proposed and on the devel release. This only applies to the order in which systemd-networkd is enabled when used as a renderer for netplan configuration, to start in multi-user.target instead of the "correct", but inefficient "network-online.target" as the latter may not be depended upon in minimal installs.

  ---

  After doing a default disco installation on s390x using the beta ISO image aka daily from March 26th and the post-install reboot the system restarts aka reipls (in z/VM in this case) but the interface is not brought up.
  Hence no remote connections are possible.

  The ip cmd shows:
  ip a
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group defaul
  t qlen 1000
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
         valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host
         valid_lft forever preferred_lft forever
  2: enc600: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default ql
  en 1000
      link/ether 02:28:0b:00:00:15 brd ff:ff:ff:ff:ff:ff

  The netplan yaml file looks fine:
  cat /etc/netplan/*.yaml
  # This file describes the network interfaces available on your system
  # For more information, see netplan(5).
  network:
    version: 2
    renderer: networkd
    ethernets:
      enc600:
        addresses: ¬ 10.245.236.27/24 |
        gateway4: 10.245.236.1
        nameservers:
            search: ¬ canonical.com |
            addresses:
                - "10.245.236.1"

  Using ip to bring the interface up doesn't help:
  buntu§hwe0007:ß$ sudo ip link set enc600 up
  sudo ip link set enc600 up
  ubuntu§hwe0007:ß$ ip addr show enc600
  ip addr show enc600
  2: enc600: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP gr
  oup default qlen 1000
      link/ether 02:28:0b:00:00:15 brd ff:ff:ff:ff:ff:ff
      inet6 fe80::28:bff:fe00:15/64 scope link
         valid_lft forever preferred_lft forever
  ubuntu§hwe0007:ß$

  But finally executing netplan apply does help:
  sudo netplan apply --dryrun
  sudo netplan apply --dryrun
  ubuntu§hwe0007:ß$ sudo netplan apply
  sudo netplan apply
  ubuntu§hwe0007:ß$ ip addr show enc600
  ip addr show enc600
  2: enc600: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP gr
  oup default qlen 1000
      link/ether 02:28:0b:00:00:15 brd ff:ff:ff:ff:ff:ff
      inet 10.245.236.27/24 brd 10.245.236.255 scope global enc600
         valid_lft forever preferred_lft forever
      inet6 fe80::28:bff:fe00:15/64 scope link
         valid_lft forever preferred_lft forever
  ubuntu§hwe0007:ß$

  (Sorry for the partly duplicate lines and some strange characters, but
  this is due to the fact that I copied the output from the console that
  requires a 3270 terminal emulation)

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