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[Launchpad Bug Tracker <1702570@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/1702570

Title:
  IPv6 subnets are not written correct to 50-cloud-init.cfg

Status in cloud-init:
  Expired

Bug description:
  I'm currently writing an open source software that should allow launching KVM cloud images.
  The bug is present in the current version of cloud-init from git.
  All versions of cloud-init in Ubuntu and Debian seem to be affected.

  I'm using the following network-config on an iso image that is
  attached to the KVM vm for usage with NoCloud datasource (for Debian 9
  ens3 needs to be changed to eth0):

  ---
  version: 1
  config:
   - type: physical
     name: ens3
     subnets:
       - type: static
         control: auto
         address: 176.9.X.X
         gateway: 176.9.X.Y
         netmask: 255.255.255.255
       - type: static6
         control: auto
         address: 2a01::X:X
         gateway: 2a01:X:Y
         netmask: 64

  This results in the following network configuration:

  auto lo
  iface lo inet loopback

  auto ens3
  iface ens3 inet static
     address 176.9.X.X
     gateway 176.9.X.Y
     netmask 255.255.255.255

  auto ens3:0
  iface ens3:0 inet6 static6
     address 2a01::X:X
     gateway 2a01::X:Y
     netmask 64

  But this is a syntax error, the "static6" should be "static".

  I was able to write a patch for this problem:

  --- eni.py.orig 2017-07-05 12:59:09.838910769 +0200
  +++ eni.py      2017-07-05 13:14:14.978143261 +0200
  @@ -367,6 +367,10 @@
                  if subnet['type'].startswith('dhcp'):
                      iface['mode'] = 'dhcp'

  +                # patch for static6
  +                if iface['mode'] == 'static6':
  +                    iface['mode'] = 'static'
  +
                  # do not emit multiple 'auto $IFACE' lines as older (precise)
                  # ifupdown complains
                  if True in ["auto %s" % (iface['name']) in line

  
  Would be nice if this fix could be deployed and possibly put in Ubuntu Xenial and Debian 9, as this enables static IPv6 configurations.

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