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

[Mark Gerrits]

For anyone hitting this issue with AKS clusters:  I have embedded the
workaround above in a daemonset to avoid having to restart all nodes
(for now)

https://gist.github.com/skinny/96e7feb6b347299ebfacaa76295a82e7

- Please check the image+tag used in the daemonset to whatever is available in your cluster.
- Deploy this daemonset to the cluster (default namespace is used)
- After all pods are running 1/1 for a bit, you can delete it
- Images can be pulled again :)

HTH

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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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