[Bug 1890903] Re: systemd-resolved.service still breaks (now 20.04, since as least 16)

[Gerben]

I think I'll steer away from systemd-resolved

1) it does not favor my primary nameserver (after a switch it'll not switch back, but continue any failover server)
2) in the end it can even use a nameserver which I have not provided (which is set by the packagebuilder)

Reading into some threads on systemd-resolved it is clear all
nameservers are expected equal. This is clearly not the case with small
business (or any business, if you ask me).

The uncontrolled usage of the external nameserver set by the
packagebuilder is also a weird choice.

These choices might be OK in certain situations (e.g. a laptop to access
the web for the wife), but clearly fails my needs.

To change to something else, seel (e.g.):
      https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved-in-ubuntu

(probably this is the cause of some nameserver issue I reported on
docker, where docker clients ended up using 8.8.8.8)

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Title:
  systemd-resolved.service still breaks (now 20.04, since as least 16)

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  There are still occurrences of this service breaking down.

  At some moment the service just stops working correctly and is not
  able to recover.

  I can reset the service by restarting it:
     systemctl restart systemd-resolved.service

  I've also tried to set the caching off, but it still fails on me
  occasionally (on 18.04 as well).

  There is a local DNS in the network, I would like to directly use that in stead of:
     nameserver 127.0.0.53

  
  Example:
  geus at desk-02:~$ ssh smb-01
  ssh: Could not resolve hostname smb-01: Temporary failure in name resolution
  ...
  root at desk-02:/home/geus# systemctl restart systemd-resolved.service
  root at desk-02:/home/geus# nslookup smb-01
  Server:		127.0.0.53
  Address:	127.0.0.53#53

  Non-authoritative answer:
  Name:	smb-01.lan
  Address: 192.168.178.39
  ...
  geus at desk-02:~$ ssh smb-01
  geus at smb-01's password:

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.2
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: GNOME
  Date: Sat Aug  8 17:03:50 2020
  InstallationDate: Installed on 2020-05-31 (69 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Tablet
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Lsusb-t:
   /:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
   /:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
       |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 480M
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-42-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /usr/lib/systemd/system/rc-local.service → /usr/lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /usr/lib/systemd/system/user at .service → /usr/lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: 1.10.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-bionic
  dmi.modalias: dmi:bvnSeaBIOS:bvr1.10.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-bionic:cvnQEMU:ct1:cvrpc-i440fx-bionic:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-bionic
  dmi.sys.vendor: QEMU

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