CoreDNS

- https://www.oreilly.com/library/view/learning-coredns/9781492047957/ch01.html

Compile with unbound

• https://coredns.io/manual/toc/

Add unbound:github.com/coredns/unbound to plugin.cfg.
Do a go generate, followed by make.

• https://coredns.io/plugins/acl/
• https://github.com/coredns/example/blob/master/example.go
• https://github.com/miekg/local/blob/master/local.go
• https://coredns.io/2017/03/01/how-to-add-plugins-to-coredns/
• https://coredns.io/plugins/
• https://coredns.io/manual/toc/
• https://coredns.io/plugins/proxy/
• https://github.com/coredns/coredns/issues/2277
• https://github.com/coredns/rrl
• https://gist.github.com/walm/0d67b4fb2d5daf3edd4fad3e13b162cb
• https://wiki.archlinux.org/index.php/CoreDNS

Golang

• https://medium.com/@openmohan/dns-basics-and-building-simple-dns-server-in-go-6cb8e1cfe461
• https://gist.github.com/walm/0d67b4fb2d5daf3edd4fad3e13b162cb
• https://github.com/openmohan/lightdns

Example coredns.conf

coredns.io:5300 {
  file /etc/coredns/zones/coredns.io.db
}

example.io:53 {
  errors
  log
  file /etc/coredns/zones/example.io.db
}

example.net:53 {
  file /etc/coredns/zones/example.net.db
}

.:53 {
    hosts {
        10.0.0.1 example.org
        fallthrough
    }
    # unbound
  errors
  log
  health
  # rewrite name foo.example.com foo.default.svc.cluster.local
  rewrite name foo.google.com www.google.com
  # kubernetes cluster.local 10.0.0.0/24
  file /etc/coredns/example.db example.org
  forward . /etc/resolv.conf
  cache 30
}

db.example.com

$ORIGIN example.org.
@  3600 IN     SOA sns.dns.icann.org. noc.dns.icann.org. (
        2017042745 ; serial
        7200       ; refresh (2 hours)
        3600       ; retry (1 hour)
        1209600    ; expire (2 weeks)
        3600       ; minimum (1 hour)
        )

 3600 IN NS a.iana-servers.net.
 3600 IN NS b.iana-servers.net.
 3600 IN NS busk.iana-servers.net.

www     IN A     127.0.0.1
        IN AAAA  ::1