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[James Falcon <1905983@xxxxxxxxxxxxxxxxxx>]

Tracked in Github Issues as https://github.com/canonical/cloud-
init/issues/3814

** Bug watch added: github.com/canonical/cloud-init/issues #3814
   https://github.com/canonical/cloud-init/issues/3814

** Changed in: cloud-init
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1905983

Title:
  Secondary network interface left unconfigured after reboot of Core 18

Status in cloud-init:
  Expired
Status in snapd:
  Fix Released

Bug description:
  We're implementing extra networking support in Multipass, and relying
  on cloud-init to configure them.

  On Ubuntu Core 18 images the extra interface's configuration gets
  purged after rebooting a couple times.

  On first boot:

  $ cat /etc/netplan/50-cloud-init.yaml 
  # This file is generated from information provided by the datasource.  Changes
  # to it will not persist across an instance reboot.  To disable cloud-init's
  # network configuration capabilities, write a file
  # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
  # network: {config: disabled}
  network:
      ethernets:
          default:
              dhcp4: true
              match:
                  macaddress: 52:54:00:f3:9f:51
          extra0:
              dhcp4: true
              dhcp4-overrides:
                  route-metric: 200
              match:
                  macaddress: 52:54:00:1a:4f:f9
              optional: true
      version: 2

  But after (an automatic, due to refresh) reboot or two:

  $ cat /etc/netplan/50-cloud-init.yaml 
  # This file is generated from information provided by the datasource.  Changes
  # to it will not persist across an instance reboot.  To disable cloud-init's
  # network configuration capabilities, write a file
  # /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
  # network: {config: disabled}
  network:
      ethernets:
          eth0:
              dhcp4: true
              match:
                  macaddress: 52:54:00:f3:9f:51
              set-name: eth0
      version: 2

  Attached is the result of `collect-logs`.

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