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[Launchpad Bug Tracker <1758879@xxxxxxxxxxxxxxxxxx>]

[Expired for cloud-init because there has been no activity for 60 days.]

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

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https://bugs.launchpad.net/bugs/1758879

Title:
  cloud-init aws doesn't changing 50-cloud-init.cfg on boot

Status in cloud-init:
  Expired

Bug description:
  Hi there,

  I notice that using the latest version of cloud-init on ubuntu xenial running on AWS the cloud-init isn't changing the 50-cloud-init.cfg file on boot, that behavior can turn the instance unreachable in some cases.
  A particular case is when you change the instance type from t2.* to r4.* and try to enable the ENA support, the network changes from eth0 to ens3 and the 50-cloud-init.cfg isn't changed to reflect it and turns the instance unreachable.

  To identify:
  Launch an instance on us-east-1 using an old ami (ami-e13739f6) and manually change the file /etc/network/interfaces.d/50-cloud-init.cfg.
  After a stop/start, the file is regenerated

  Launch an instance on us-east-1 using the latest ami (ami-66506c1c) and anually change the file /etc/network/interfaces.d/50-cloud-init.cfg.
  After a stop/start, the file remains the same.

  I cannot found if it's a bug or an expected behavior, however, it
  seems a bug as the file has a message saying that "Changes to it will
  not persist across an instance."

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