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[James Falcon <1755260@xxxxxxxxxxxxxxxxxx>]

Tracked in Github Issues as https://github.com/canonical/cloud-
init/issues/3136

** Bug watch added: github.com/canonical/cloud-init/issues #3136
   https://github.com/canonical/cloud-init/issues/3136

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

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https://bugs.launchpad.net/bugs/1755260

Title:
  [Azure] Published hostname (ddns) gets reset on reboot after
  `hostnamectl set-hostname`

Status in cloud-init:
  Expired

Bug description:
  Verified on Azure, using Trusty
  (Canonical:UbuntuServer:14.04.5-LTS:14.04.201803080) (cloud-init
  0.7.5-0ubuntu1.22)

  1. create a Trusty VM:
     az vm create -g paulmey-test -n ubuntu14 --image Canonical:UbuntuServer:14.04.5-LTS:latest
  2. On the VM, edit /etc/waagent.conf to set Provisioning.MonitorHostName=y and restart the agent.
     This sets waagent to ifdown/ifup when it detects a hostname change such that the new hostname is
     sent on the DHCP request, which in Azure populates the instance DNS.
  3. verify 'nslookup ubuntu14' shows a DNS record for the initial hostname (ubuntu14)
  4. run 'hostnamectl set-hostname seeifitsticks' to change the hostname
  5. Wait a minute for the update to propagate, verify that 'nslookup seeifitsticks' now shows a DNS
     record for the new hostname. Verify that /etc/hostname is updated. Verify that 'nslookup ubuntu14'
     no longer returns a valid DNS record.
  6. reboot the vm
  7. Once back up, notice that the hostname is seeifitsticks. However, 'nslookup seeifitsticks' returns
     NXDOMAIN, which 'nslookup ubuntu14' shows a DNS record.

  From the cloud-init log, it looks like cloud-init sets the hostname to
  whatever is in the ovf-env.xml during interface bounce. On Xenial, the
  data source is loaded from cache, which is why this code does not even
  run.

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