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

[James Adler]

@atykhyy thank you that worked for VMSS!

I also had some VMs without scale sets, fixed those with:

az vm availability-set list -g <resourcegroup> --query
"[].virtualMachines[].id" --output tsv | az vm 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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https://bugs.launchpad.net/bugs/1988119

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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