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[Launchpad Bug Tracker <1620559@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-4ubuntu8

---------------
systemd (229-4ubuntu8) xenial-proposed; urgency=medium

  * Queue loading transient units after setting their properties. Fixes
    starting VMs with libvirt. (LP: #1529079)
  * Connect pid1's stdin/out/err fds to /dev/null also for containers. This
    fixes generators which expect a valid stdout/err fd in some container
    technologies. (LP: #1608953)
  * 73-usb-net-by-mac.rules: Do not run readlink for *every* uevent, and
    merely check if /etc/udev/rules.d/80-net-setup-link.rules exists.
    A common way to disable an udev rule is to just "touch" it in
    /etc/udev/rule.d/ (i. e. empty file), and if the rule is customized we
    cannot really predict anyway if the user wants MAC-based USB net names or
    not. (LP: #1615021)
  * systemd-networkd-resolvconf-update.service: Also pick up DNS servers from
    individual link leases, as they sometimes don't appear in the global
    ifstate. (LP: #1620559)

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Tue, 06 Sep 2016 14:16:29
+0200

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1620559

Title:
  /etc/resolv.conf is empty on snappy

Status in Snappy:
  New
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Released

Bug description:
  we currently have no working resolver on snappy installs,
  /etc/resolv.conf is the boilerplate one.

  on the low level we seem to have DNS from the DHCP server though

  ogra@localhost:~$ grep -r DNS= /run/systemd/netif
  /run/systemd/netif/leases/3:DNS=217.237.150.115 217.237.151.205
  /run/systemd/netif/links/3:DNS=217.237.150.115 217.237.151.205
  /run/systemd/netif/links/3:MDNS=no
  ogra@localhost:~$

  SRU INFORMATION
  ===============
  Fix: https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?h=ubuntu-xenial&id=0a96feb1561

  
  Test case:

  I cannot reproduce this in a VM or normal laptop, this is somehow
  specific to the reporter's hardware/DHCP server config.

   * Configure systemd-networkd for an ethernet interface, either directly or via netplan; remove it from /etc/network/interfaces{,.d}
   * Reboot.
   * With current xenial's systemd, if /run/systemd/netif/state does not have "DNS=" then /etc/resolv.conf will not have any nameserver.
   * With the proposed update, /etc/resolv.conf should have the DHCP-provided nameserver.

  Regression potential: Low; in 16.04 LTS we do not configure networkd
  by any Ubuntu tool, so networkd is not widely used there yet. For
  systems which do use it it could happen that interface-specific DNS
  servers now appear in resolv.conf that should not be global -- but we
  do not have anything that would configure or obey this setup in 16.04.

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