[Bug 1713578] Re: Migrate /etc/resolv.conf from resolvconf to systemd-resolved

[Dimitri John Ledkov]

At the moment the following is done:
- on debootstrap resolved symlink is configured
- on upgrades resolvconf is preserved, and resolved is integrated to feed data into resolvconf
- if upgraded resolvconf is removed, the postrm in artful configured symlink to point at resolved
- static file is preserved i believe (need to check)
- if /etc/resolv.conf is a static file configured by network-manager, resolved may take over it (since network-manager has resolved integration), but currently doesn't.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to systemd in Ubuntu.
https://bugs.launchpad.net/bugs/1713578

Title:
  Migrate /etc/resolv.conf from resolvconf to systemd-resolved

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Moving off of resolvconf and to systemd-resolved requires that
  resolv.conf is properly handled both in the case of new installs (done
  as per 234-2ubuntu9 at least), but also in the case of upgrades from
  previous releases or previous versions of systemd.

  There are various use cases to take into account:

  1) upgrades where resolv.conf is more or less default and dynamic,
  uses DHCP via ifupdown (servers), or 127.0.1.1/DHCP settings from
  NetworkManager (desktops), etc.

  2) upgrades from manual resolv.conf settings (the user has written
  their own, it's static)

  3) upgrades from manual resolv.conf managed via resolvconf.

  3) No resolv.conf?

  Lack of resolv.conf is simple, writing one is always sane.

  Upgrades from dynamic files is also straightforward, copying it to
  /run/systemd/resolve/resolv.conf will keep the current state;
  /etc/resolv.conf will be symlinked to that.

  In the case of a manually-configured resolv.conf; whether it comes
  from resolvconf or is manually configured is non-trivial if we want to
  maintain the current DNS configuration and also remove resolvconf. The
  removal of resolvconf can be forced, but what do we do about the
  existing /etc/resolv.conf file, knowing that /run is a tmpfs?

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1713578/+subscriptions