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

[Dan Streetman]

To debug the systemd-resolved service, you can run

$ sudo systemctl edit systemd-resolved

and in the editor that is opened, add and save this content:

[Service]
Environment=SYSTEMD_LOG_LEVEL=debug

then restart systemd-resolved, or reboot. Then once the problem happens
again, check:

$ journalctl -b -u systemd-resolved

to see if there are any problems logged. You can check the current log
also, as it may have logged some problems even without debugging
enabled, although to check the logs for previous boots you should leave
the -b parameter off.

If any problem was logged you can paste that part of the log here, or
just attach the full log.

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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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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