I recently investigated a warning message on Kubernetes that said: DNSConfigForming ... Nameserver limits were exceeded, some nameservers have been omitted. This was technically a Kubernetes event with type: Warning, and these usually indicate that there’s something wrong, so I wanted to investigate it. This led me down a pretty deep rabbit hole about DNS resolution on Linux in general and Kubernetes in particular. I thought it might be helpful to others to explain how this all works, just in ca...