[Bug 1956447] Re: "No DNS servers known" in /run/systemd/resolve/resolv.conf

[Nick Rosbrook]

Please open a new bug if this is still observed on newer releases.

** Changed in: systemd (Ubuntu)
       Status: New => Won't Fix

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Title:
  "No DNS servers known" in /run/systemd/resolve/resolv.conf

Status in systemd package in Ubuntu:
  Won't Fix

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or System -> About Ubuntu
  Description:	Ubuntu 20.04.3 LTS
  Release:	20.04

  2) The version of the package you are using, via 'apt-cache policy pkgname' or by checking in Software Center
  systemd:
    Installed: 245.4-4ubuntu3.13
    Candidate: 245.4-4ubuntu3.13

  3) What you expected to happen

  /etc/network/interfaces:

  auto lo
  iface lo inet loopback
      dns-nameservers 1.1.1.1 8.8.8.8

  auto eth0
  iface eth0 inet static
      address ip/24
      mtu 1500
      post-up route add default gw gw_ip || true
      pre-down route del default gw gw_ip || true

  
  When system rebooted I expected in

  /run/resolvconf/resolv.conf:
  nameserver 1.1.1.1
  nameserver 8.8.8.8
  nameserver 127.0.0.53

  and in /run/systemd/resolve/resolv.conf:
  nameserver 1.1.1.1
  nameserver 8.8.8.8

  This is stated in "man 8 systemd-resolved":
  systemd-resolved maintains the /run/systemd/resolve/resolv.conf file for compatibility with traditional Linux programs

  4) What happened instead

  /run/systemd/resolve/resolv.conf:
  # No DNS servers known.

  But after restarting systemd-resolved it update this file correctly.

  
  5) Also

  The system behaves correctly when DHCP is used. So when in /etc/network/interfaces:
  auto lo
  iface lo inet loopback
  auto eth0
  iface eth0 inet dhcp

  Then /run/systemd/resolve/resolv.conf updated correctly straight
  without restart.

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