[Bug 1732002] Re: cloud images in lxc get ipv6 address

[Ryan Harper]

The MP has been moved to a github PR:

https://github.com/CanonicalLtd/netplan/pull/19

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Title:
  cloud images in lxc get ipv6 address

Status in nplan package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  I noticed that lxd (lxc list) reports that an lxc container has an
  ipv6 address in artful or bionic.  It does not list this in xenial or
  zesty.  I suspect this change occurred in the switch over to
  netplan/networkd.

  This may at first seem harmless or even desired, but note that the
  user configuration did not request ipv6 config, so its presence is a
  bug.

  $ for rel in xenial zesty artful bionic; do
     lxc launch ubuntu-daily:$rel $rel-demo; done
  Creating xenial-demo
  Starting xenial-demo
  ..
  Creating bionic-demo
  Starting bionic-demo

  
  $ sleep 10
  $ lxc list
  $ lxc list
  +-------------+---------+----------------------+------------------------------------------------+------------+-----------+
  |    NAME     |  STATE  |         IPV4         |                      IPV6                      |    TYPE    | SNAPSHOTS |
  +-------------+---------+----------------------+------------------------------------------------+------------+-----------+
  | artful-demo | RUNNING | 10.75.205.208 (eth0) | fd42:eee5:7c43:3d62:3a42:611c:3f6f:1184 (eth0) | PERSISTENT | 0         |
  +-------------+---------+----------------------+------------------------------------------------+------------+-----------+
  | bionic-demo | RUNNING | 10.75.205.187 (eth0) | fd42:eee5:7c43:3d62:6f4:155b:39cc:fc3d (eth0)  | PERSISTENT | 0         |
  +-------------+---------+----------------------+------------------------------------------------+------------+-----------+
  | xenial-demo | RUNNING | 10.75.205.143 (eth0) |                                                | PERSISTENT | 0         |
  +-------------+---------+----------------------+------------------------------------------------+------------+-----------+
  | zesty-demo  | RUNNING | 10.75.205.123 (eth0) |                                                | PERSISTENT | 0         |
  +-------------+---------+----------------------+------------------------------------------------+------------+-----------+

  ## Here is the config that was provided by lxd
  $ lxc exec bionic-demo cat /var/lib/cloud/seed/nocloud-net/network-config
  version: 1
  config:
      - type: physical
        name: eth0
        subnets:
            - type: dhcp
              control: auto

  ## Here is the config that cloud-init rendered.
  $ lxc exec bionic-demo -- grep -v '^#' /etc/netplan/50-cloud-init.yaml
  network:
      version: 2
      ethernets:
          eth0:
              dhcp4: true

  $ lxc exec bionic-demo cat /run/systemd/network/10-netplan-eth0.network
  [Match]
  Name=eth0

  [Network]
  DHCP=ipv4

  [DHCP]
  UseMTU=true
  RouteMetric=100

  $ lxc exec bionic-demo  -- systemctl status --no-pager --full systemd-networkd
  ● systemd-networkd.service - Network Service
     Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled; vendor preset: enabled)
     Active: active (running) since Mon 2017-11-13 18:37:34 UTC; 8min ago
       Docs: man:systemd-networkd.service(8)
   Main PID: 118 (systemd-network)
     Status: "Processing requests..."
      Tasks: 1 (limit: 4915)
     Memory: 2.0M
        CPU: 19ms
     CGroup: /system.slice/systemd-networkd.service
             └─118 /lib/systemd/systemd-networkd

  Nov 13 18:37:34 bionic-demo systemd[1]: Starting Network Service...
  Nov 13 18:37:34 bionic-demo systemd-networkd[118]: eth0: Gained IPv6LL
  Nov 13 18:37:34 bionic-demo systemd-networkd[118]: Enumeration completed
  Nov 13 18:37:34 bionic-demo systemd[1]: Started Network Service.
  Nov 13 18:37:37 bionic-demo systemd-networkd[118]: eth0: DHCPv6 address fd42:eee5:7c43:3d62:6f4:155b:39cc:fc3d/128 timeout preferred 3600 valid 3600
  Nov 13 18:37:37 bionic-demo systemd-networkd[118]: eth0: DHCPv4 address 10.75.205.187/24 via 10.75.205.1
  Nov 13 18:37:37 bionic-demo systemd-networkd[118]: Not connected to system bus, ignoring transient hostname.
  Nov 13 18:37:39 bionic-demo systemd-networkd[118]: eth0: Configured
  Nov 13 18:38:09 bionic-demo systemd-networkd[118]: Could not set hostname: Method call timed out

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: nplan 0.30
  ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
  Uname: Linux 4.13.0-16-generic x86_64
  ApportVersion: 2.20.7-0ubuntu4
  Architecture: amd64
  Date: Mon Nov 13 18:27:53 2017
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
  SourcePackage: nplan
  UpgradeStatus: No upgrade log present (probably fresh install)

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