[Bug 1790509] Re: netplan doesn't configure renamed device

[my balzitch]

-- Reboot --
Sep 03 09:48:42 ubuntu systemd-networkd[317]: Enumeration completed
Sep 03 09:48:42 ubuntu systemd[1]: Started Network Service.
Sep 03 09:48:42 ubuntu systemd-networkd[317]: eth0: Interface name change detected, eth0 has been renamed to mainif.
Sep 03 09:50:53 ubuntu systemd[1]: Stopping Network Service...
Sep 03 09:50:53 ubuntu systemd[1]: Stopped Network Service.
Sep 03 09:50:54 ubuntu systemd[1]: Starting Network Service...
Sep 03 09:50:54 ubuntu systemd-networkd[627]: Enumeration completed
Sep 03 09:50:54 ubuntu systemd[1]: Started Network Service.
Sep 03 09:50:54 ubuntu systemd-networkd[627]: lo: Link is not managed by us
Sep 03 09:50:54 ubuntu systemd-networkd[627]: vlan5: netdev ready
Sep 03 09:50:54 ubuntu systemd-networkd[627]: mainif: IPv6 successfully enabled
Sep 03 09:50:54 ubuntu systemd-networkd[627]: vlan5: Gained carrier
Sep 03 09:50:54 ubuntu systemd-networkd[627]: lo: Link is not managed by us
Sep 03 09:50:54 ubuntu systemd-networkd[627]: mainif: Gained carrier
Sep 03 09:50:54 ubuntu systemd-networkd[627]: vlan5: Gained IPv6LL
Sep 03 09:50:54 ubuntu systemd-networkd[627]: vlan5: Configured
Sep 03 09:50:56 ubuntu systemd-networkd[627]: mainif: Gained IPv6LL
Sep 03 09:50:56 ubuntu systemd-networkd[627]: mainif: Configured

In this log I logged in 2 minutes later and ran sudo netplan apply

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https://bugs.launchpad.net/bugs/1790509

Title:
  netplan doesn't configure renamed device

Status in systemd package in Ubuntu:
  New

Bug description:
  configured yaml file per documentation, ran netplan generate, netplan
  apply. Interfaces are configured at this point.

  Upon reboot the system renames ens18 to mainlink per config, but stops
  after that point. System has no connectivity. mainif shows as DOWN in
  ip addr list, networkctl shows mainif setup as unmanaged

  Logging in via tty and running "sudo netplan apply" restores
  connectivity.

  Description:	Ubuntu 18.04.1 LTS
  Release:	18.04

  yaml file:

  # This file describes the network interfaces available on your system
  # For more information, see netplan(5).
  network:
    version: 2
    renderer: networkd
    ethernets:
      mainif:
        match:
          macaddress: "d2:a0:b9:2b:73:c4"
        set-name: mainif
        dhcp4: false
        dhcp6: false
    vlans:
        vlan5:
          id: 5
          link: mainif
          addresses: [ 10.0.69.15/24 ]
          gateway4: 10.0.69.1
          nameservers:
            search: [ mydomain.com ]
            addresses:
                - "10.0.69.2"

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.3
  ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
  Uname: Linux 4.15.0-33-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  Date: Mon Sep  3 09:42:57 2018
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-33-generic root=UUID=62ef2837-fce8-4133-ba14-07a7d5eab911 ro splash quiet net.ifnames=0 vt.handoff=1
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-2.11
  dmi.modalias: dmi:bvnSeaBIOS:bvrrel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.11:cvnQEMU:ct1:cvrpc-i440fx-2.11:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-2.11
  dmi.sys.vendor: QEMU

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