[Bug 1868329] [NEW] ifupdown does not render viable /etc/network/interfaces on bionic ec2 cloud-images

[Chad Smith]

Public bug reported:

Filing this bug for clarification and tracking on Ubuntu Bionic and
later.

Canonical cloudimages for Ec2 and other clouds leave an artifact that
disables /etc/network/interface with the following content:

# ifupdown has been replaced by netplan(5) on this system.  See
# /etc/netplan for current configuration.
# To re-enable ifupdown on this system, you can run:
#    sudo apt install ifupdown

In following the suggested text, installing the ifupdown deb continues
to leave a broken system because ifupdown.postinst script creates an
/etc/network/interfaces.d parts directory but does not write out a
working /etc/network/interfaces file if the file exists on the system.

This leaves a broken /etc/network/interfaces files which doesn't source
/etc/network/interfaces.d/* and 3rd parties cannot use the interfaces.d
parts directory to extend networking config.

Cloud-init is one of those users of /etc/network/interfaces.d/ for
rendering system networking on cloud images. Per LP: #1867029

** Affects: ifupdown (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: uec-images

** Description changed:

  Filing this bug for clarification and tracking on Ubuntu Bionic and
  later.
  
- 
- Canonical cloudimages for Ec2 and other clouds leave an artifact that disables /etc/network/interface with the following content:
+ Canonical cloudimages for Ec2 and other clouds leave an artifact that
+ disables /etc/network/interface with the following content:
  
  # ifupdown has been replaced by netplan(5) on this system.  See
  # /etc/netplan for current configuration.
  # To re-enable ifupdown on this system, you can run:
  #    sudo apt install ifupdown
  
- 
- In following the suggested text, installing the ifupdown deb continues to leave a broken system because ifupdown.postinst script creates an /etc/network/interfaces.d parts directory but does not write out a working /etc/network/interfaces file if the file exists on the system.
+ In following the suggested text, installing the ifupdown deb continues
+ to leave a broken system because ifupdown.postinst script creates an
+ /etc/network/interfaces.d parts directory but does not write out a
+ working /etc/network/interfaces file if the file exists on the system.
  
  This leaves a broken /etc/network/interfaces files which doesn't source
  /etc/network/interfaces.d/* and 3rd parties cannot use the interfaces.d
  parts directory to extend networking config.
+ 
+ Cloud-init is one of those users of /etc/network/interfaces.d/ for
+ rendering system networking on cloud images. Per LP: #1867029

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https://bugs.launchpad.net/bugs/1868329

Title:
  ifupdown does not render viable /etc/network/interfaces on bionic ec2
  cloud-images

Status in ifupdown package in Ubuntu:
  New

Bug description:
  Filing this bug for clarification and tracking on Ubuntu Bionic and
  later.

  Canonical cloudimages for Ec2 and other clouds leave an artifact that
  disables /etc/network/interface with the following content:

  # ifupdown has been replaced by netplan(5) on this system.  See
  # /etc/netplan for current configuration.
  # To re-enable ifupdown on this system, you can run:
  #    sudo apt install ifupdown

  In following the suggested text, installing the ifupdown deb continues
  to leave a broken system because ifupdown.postinst script creates an
  /etc/network/interfaces.d parts directory but does not write out a
  working /etc/network/interfaces file if the file exists on the system.

  This leaves a broken /etc/network/interfaces files which doesn't
  source /etc/network/interfaces.d/* and 3rd parties cannot use the
  interfaces.d parts directory to extend networking config.

  Cloud-init is one of those users of /etc/network/interfaces.d/ for
  rendering system networking on cloud images. Per LP: #1867029

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