[Bug 1759014] Please test proposed package

[Steve Langasek]

Hello Alan, or anyone else affected,

Accepted netplan.io into bionic-proposed. The package will build now and
be available at
https://launchpad.net/ubuntu/+source/netplan.io/0.96-0ubuntu0.18.04.2 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

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https://bugs.launchpad.net/bugs/1759014

Title:
  Netplan has no way to control DHCP client

Status in netplan:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released
Status in systemd package in Ubuntu:
  Confirmed
Status in netplan.io source package in Bionic:
  Fix Committed
Status in systemd source package in Bionic:
  Confirmed
Status in netplan.io source package in Cosmic:
  Fix Committed
Status in systemd source package in Cosmic:
  Confirmed
Status in netplan.io source package in Disco:
  Fix Released
Status in systemd source package in Disco:
  Confirmed

Bug description:
  [Impact]
  DHCP configurations where custom settings (routes, nameservers, etc.) need to be applied.

  [Test case]
  1) Configure netplan for the particulars of the network by configuring an appropriate dhcp{4,6}-override stanza:

  network:
    version: 2
    ethernets:
      engreen:
        dhcp4: true
        dhcp4-overrides:
          use-dns: false
          use-routes: false
          route-metric: 3333

  Additionally, if so required, add a custom DNS / routes to the
  configuration. e.g.

        nameservers:
          search: [lab, kitchen]
          addresses: [8.8.8.8]

  (See https://netplan.io/reference#dhcp-overrides for the available
  options)

  2) Run 'netplan apply' or reboot to have the configuration applied.
  3) Validate that the routes / DNS are properly ignored and/or replaced by the defined values.

  [Regression potential]
  Minimal; this adds new values to the configuration generated for networkd or NetworkManager. Existing configurations will remain unchanged, but new configurations using the dhcp{4,6}-overrides fields will benefit from additional flexibility.

  
  ---

  
  Currently DHCP appears to be an all or nothing boolean, which is insufficient for many network configurations.

  Ideally all of the DHCP configuration options supported by systemd would also be supported in netplan:
  https://www.freedesktop.org/software/systemd/man/systemd.network.html#%5BDHCP%5D%20Section%20Options

  As an example, consider the following netplan configuration:

  network:
    version: 2
    renderer: networkd
    ethernets:
      enp0s3:
        dhcp4: yes
        nameservers: [8.8.8.8,8.8.4.4]

  After running netplan apply I check the nameservers with systemd-
  resolve --status and it shows:

  DNS Servers: 8.8.8.8
               8.8.4.4
               192.168.1.1

  Here, "192.168.1.1" was provided by my DHCP server.  On this
  particular node, I only want the manually configured DNS servers, but
  netplan has no way to indicate this.

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