[Bug 1988119] Re: Update to systemd 237-3ubuntu10.54 broke dns

[Liam Macgillavry]

az cli from cmd.exe, something like this for AKS nodes experiencing the
issue: az vmss list-instances -g <resourcegroup> -n vmss --query "[].id"
--output tsv | az vmss run-command invoke --scripts "echo
FallbackDNS=168.63.129.16 >> /etc/systemd/resolved.conf; systemctl
restart systemd-resolved.service" --command-id RunShellScript --ids @-

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Title:
  Update to systemd 237-3ubuntu10.54 broke dns

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Two servers today that updated systemd to "systemd 237-3ubuntu10.54" 
  https://ubuntu.com/security/notices/USN-5583-1

  could not resolve dns anymore.
  no dns servers, normally set through dhcp.

  Ubuntu 18.04

  Temp fix.
   1. Edit /etc/systemd/resolved.conf
   1. Add/Uncomment # FallbackDNS=168.63.129.16
   1. Restart systemd-resolved sudo systemctl restart systemd-resolved.service
   1. Confirm dns working with systemd-resolve google.com

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