best practice core config files

[faraday23]

It would be fantastic to see some best practices for some of the coredns yaml files that were mentioned in the book!

//example
Example 8-3 shows the log plug-in in use.
Example 8-3. The log plug-in in action

. {
forward . 8.8.8.8 8.8.4.4
cache 3600
log
}