Ubuntu
systemd package

  1. Bug #1988119
  2. Comment #13

Comment 13 for bug 1988119

Revision history for this message
Stefan Zwanenburg (zwaantje) wrote (last edit ): Re: Update to systemd 237-3ubuntu10.54 broke dns

> Could this be a related issue, when deployment to aks fails, due to a connection refused when pulling images from azure container registry(ImagePullBackOff).

I you look closer at the message accompanying the ImagePullBackOff, you should see something like:
  dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:36288->[::1]:53: read: connection refused

Port 53 is the port a DNS server usually listens on.

If this is what you're seeing, then yes: your problems are caused by the issue described in here.