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[Launchpad Bug Tracker <1815051@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package cloud-init -
18.5-45-g3554ffe8-0ubuntu1

---------------
cloud-init (18.5-45-g3554ffe8-0ubuntu1) disco; urgency=medium

  * New upstream snapshot.
    - cloud-init-per: POSIX sh does not support string subst, use sed
      (LP: #1819222)

 -- Daniel Watkins <oddbloke@xxxxxxxxxx>  Fri, 08 Mar 2019 17:42:34
-0500

** Changed in: cloud-init (Ubuntu)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1815051

Title:
  Bionic netplan render invalid yaml duplicate anchor declaration for
  nameserver entries

Status in cloud-init:
  Fix Committed
Status in cloud-init package in Ubuntu:
  Fix Released
Status in cloud-init source package in Xenial:
  Confirmed
Status in cloud-init source package in Bionic:
  Confirmed
Status in cloud-init source package in Cosmic:
  Confirmed

Bug description:
  The netplan configuration redeclares the nameservers anchor for every
  single section (vlans, bonds), and use the same id for similar entries
  (id001).

  In this specific case the network configuration in maas have a bond0
  with two vlans, bond0.3502 and bond0.3503, and an untagged bond1
  without vlans. The rendered 50-cloud-init.yaml looks like this:

  network:
      version: 2
      ethernets:
  ...
      bonds:
  ...
          bond1:
  ...
              nameservers: &id001 <- anchor declaration here
                  addresses:
                  - 255.255.255.1
                  - 255.255.255.2
                  - 255.255.255.3
                  - 255.255.255.5
                  search:
                  - customer.domain
                  - maas
  ...
          bondM:
  ...
              nameservers: *id001

     vlans:
          bond0.3502:
  ...
              nameservers: &id001 <- anchor redeclaration here
                  addresses:
                  - 255.255.255.1
                  - 255.255.255.2
                  - 255.255.255.3
                  - 255.255.255.5
                  search:
                  - customer.domain
                  - maas
          bond0.3503:
  ...
              nameservers: *id001

  As the cloudinit renders an invalid yaml file, the netplan apply
  produces the following error: (due to the anchor redeclaration in the
  vlans section):

     Invalid YAML at /etc/netplan/50-cloud-init.yaml line 118 column 25:
  second occurence

  This render bug prevents us using the untagged bond and the bond with
  the vlans in the same configuration.

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