[Bug 1779340] Re: systemd-networkd-wait-online.service Failed to start Wait for Network to be Configured with bridge

[keestux]

My setup is a little bit different, but the problem is the same. I have
a bridge device for LXD. This is an extra bridge for testing purpose.

root at rapper:~# cat /etc/netplan/91-test-bridges.yaml 
network:
  version: 2
  renderer: networkd
  bridges:
    # the key name is the name for virtual (created) interfaces;
    # no ‘match’ or ‘set-name’ attributes are allowed.
    testbr0:
      addresses:
      - 10.82.0.1/24
      # gateway4: 192.168.178.1

At startup there are no containers using this bridge, and that causes the
2 minute timeout of systemd-networkd-wait-online

root at rapper:~# networkctl
IDX LINK             TYPE               OPERATIONAL SETUP     
  1 lo               loopback           carrier     unmanaged 
  2 enp2s0           ether              carrier     configured
  3 testbr0          ether              no-carrier  configuring
  4 br0              ether              routable    configured

root at rapper:~# /lib/systemd/systemd-networkd-wait-online --timeout=20 --interface testbr0
ignoring: lo
Event loop failed: Connection timed out

I couldn't find a way to skip my test bridge for this online check, and
still keep it controlled by networkd.

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https://bugs.launchpad.net/bugs/1779340

Title:
  systemd-networkd-wait-online.service Failed to start Wait for Network
  to be Configured with bridge

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  The following simple netplan config results in a 2-minut unneccessary
  delay on boot. Everything works like it should in the end. The bridge
  has no interfaces due to a regression in Ubuntu migrating to netplan
  (see
  https://bugs.launchpad.net/ubuntu/+source/netplan.io/+bug/1779341).

  ubuntu at molnix3:~$ cat /etc/netplan/01-netcfg.yaml
  # This file describes the network interfaces available on your system
  # For more information, see netplan(5).
  network:
    version: 2
    renderer: networkd
    ethernets:
      enp4s0:
        dhcp4: yes
        dhcp6: yes

  ubuntu at molnix3:~$ cat /etc/netplan/br1.yaml
  network:
    version: 2
    bridges:
      br1:
        addresses: [10.1.0.9/16]
        interfaces: []

  ubuntu at molnix3:~$ cat /usr/lib/networkd-dispatcher/routable.d/tap0
  #!/bin/sh
  set -e
   if [ "$IFACE" = tap0 ]; then
    brctl addif br1 tap0
    ip link set tap0 promisc on
    ifmetric tap0 5
  fi

  ubuntu at molnix3:~$ journalctl -u systemd-networkd-wait-online.service -b
  -- Logs begin at Thu 2018-06-28 10:07:29 UTC, end at Fri 2018-06-29 14:09:18 UTC. --
  Jun 29 13:58:16 molnix3 systemd[1]: Starting Wait for Network to be Configured...
  Jun 29 13:58:16 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:16 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:16 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:16 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:16 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:16 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:17 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:17 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:17 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:17 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:18 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:18 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:19 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:20 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:20 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 13:58:21 molnix3 systemd-networkd-wait-online[1468]: ignoring: lo
  Jun 29 14:00:16 molnix3 systemd-networkd-wait-online[1468]: Event loop failed: Connection timed out
  Jun 29 14:00:16 molnix3 systemd[1]: systemd-networkd-wait-online.service: Main process exited, code=exited, status=1/FAILURE
  Jun 29 14:00:16 molnix3 systemd[1]: systemd-networkd-wait-online.service: Failed with result 'exit-code'.
  Jun 29 14:00:16 molnix3 systemd[1]: Failed to start Wait for Network to be Configured.

  ubuntu at molnix3:~$ /lib/systemd/systemd-networkd-wait-online
  managing: br1
  managing: enp4s0
  ignoring: lo

  ubuntu at molnix3:~$ networkctl
  IDX LINK             TYPE               OPERATIONAL SETUP
    1 lo               loopback           carrier     unmanaged
    2 enp4s0           ether              routable    configured
    3 br1              ether              routable    configured
    4 tap0             ether              routable    unmanaged

  4 links listed.

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