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

[Chad Smith]

** 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:
  
  # ifupdown has been replaced by netplan(5) on this system.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
+ 
+ I have attached ifupdwown-test.sh which exercises this issue on lxc by
+ mocking the CPC cloudimage artifact.

** Attachment added: "ifupdown-test.sh"
   https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1868329/+attachment/5339500/+files/ifupdown-test.sh

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ifupdown in Ubuntu.
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  # ifupdown has been replaced by netplan(5) on this system.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

  I have attached ifupdwown-test.sh which exercises this issue on lxc by
  mocking the CPC cloudimage artifact.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1868329/+subscriptions