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

[Mathieu Trudel-Lapierre]

This seems quite likely to be an issue with netplan; I've had a similar
report on UC18; where systemd-networkd isn't started.

Turns out netplan moved the enablement of systemd-netwrokd to network-
online.target; but unfortunately there may be no service or target
depending on that. I'll revert the change to put systemd-networkd back
under multi-user.target.

** Also affects: netplan.io (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: netplan.io (Ubuntu)
       Status: New => Triaged

** Changed in: netplan.io (Ubuntu)
   Importance: Undecided => Critical

** Changed in: netplan.io (Ubuntu)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (cyphermox)

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

Status in Ubuntu on IBM z Systems:
  New
Status in netplan.io package in Ubuntu:
  Triaged
Status in systemd package in Ubuntu:
  New

Bug description:
  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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