[Bug 1915746] Re: systemd-resolved configuration does not resolve any hostnames

[Dan Streetman]

> # cat /etc/resolv.conf (linked to /run/resolvconf/resolv.conf)

resolvconf has been discouraged for a while; you should remove it, and
have resolv.conf symlink to the systemd-resolved stub-resolv.conf file.

Even if you need to keep it, this isn't a systemd bug, it would be a bug
in resolvconf (or possibly just a local misconfiguration).

** Package changed: systemd (Ubuntu) => resolvconf (Ubuntu)

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Title:
  systemd-resolved configuration does not resolve any hostnames

Status in resolvconf package in Ubuntu:
  New

Bug description:
  systemd-resolved will, unter certain circumstances create local only
  DNS resolution:

  # host google.com
  ;; connection timed out; no servers could be reached

  
  looking at what is going on behind:

  # cat /etc/resolv.conf (linked to /run/resolvconf/resolv.conf)
  nameserver 127.0.0.1
  nameserver 127.0.0.53
  search <search1> <search2> <search3> DOMAINS

  # systemd-resolve --status
  Global
           Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
    resolv.conf mode: foreign
  Current DNS Server: 127.0.0.1
         DNS Servers: 127.0.0.1
          DNS Domain: DOMAINS <search1> <search2> <search3>

  Link 2 (eth0)
  Current Scopes: none
       Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
      DNS Domain: DOMAINS

  Link 3 (virbr0)
  Current Scopes: none
       Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

  Link 4 (vmnet1)
  Current Scopes: none
       Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

  Link 5 (vmnet2)
  Current Scopes: none
       Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

  Link 6 (vmnet8)
  Current Scopes: none
       Protocols: -DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported

  This is a useless configuration: dnsmasq asks systemd-resolvd,
  systemd-resolvd asks dnsmasq. Without ever going to any of the
  upstream servers. One of them: systemd-resolvd or dnsmasq shall ask
  upstream servers. But non of them does.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: systemd 247.1-4ubuntu1
  ProcVersionSignature: Ubuntu 5.8.0-36.40+21.04.1-generic 5.8.18
  Uname: Linux 5.8.0-36-generic x86_64
  ApportVersion: 2.20.11-0ubuntu57
  Architecture: amd64
  CasperMD5CheckResult: unknown
  Date: Mon Feb 15 19:16:05 2021
  InstallationDate: Installed on 2014-01-31 (2572 days ago)
  InstallationMedia: Ubuntu-Server 13.10 "Saucy Salamander" - Release amd64 (20131016)
  MachineType: Hewlett-Packard HP Compaq 6200 Pro MT PC
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-5.8.0-36-generic root=UUID=de4af024-5d59-4f85-b5ca-11f17f085706 ro rootflags=subvol=@ consoleblank=0 video=DP-1:e,HDMI-1:e
  SourcePackage: systemd
  UpgradeStatus: Upgraded to hirsute on 2018-11-23 (815 days ago)
  dmi.bios.date: 11/10/2011
  dmi.bios.release: 2.15
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: J01 v02.15
  dmi.board.name: 1497
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.type: 6
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrJ01v02.15:bd11/10/2011:br2.15:svnHewlett-Packard:pnHPCompaq6200ProMTPC:pvr:rvnHewlett-Packard:rn1497:rvr:cvnHewlett-Packard:ct6:cvr:
  dmi.product.family: 103C_53307F G=D
  dmi.product.name: HP Compaq 6200 Pro MT PC
  dmi.product.sku: XL504AV
  dmi.sys.vendor: Hewlett-Packard
  mtime.conffile..etc.systemd.resolved.conf: 2021-02-15T19:09:12.129281

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